Quick view Details GY6 STORE 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS MSRP: Now: $74.95 Add to Cart Compare Quick view Details GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A MSRP: Now: $89.95 Add to Cart Compare Quick view Details GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS MSRP: Now: $19.95 Add to Cart Compare Quick view Details HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) MSRP: Now: $174.95 Add to Cart Compare Quick view Details NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $232.95 Add to Cart Compare Quick view Details NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) MSRP: Now: $249.95 Add to Cart Compare Quick view Details NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 MSRP: Now: $124.95 Add to Cart Compare Quick view Details NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 MSRP: Now: $124.95 Add to Cart Compare Quick view Details TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) MSRP: Now: $179.95 Add to Cart Compare Quick view Details TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS MSRP: Now: $273.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR MSRP: Now: $264.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON MSRP: Now: $699.95 Add to Cart Compare Quick view GY6 STORE 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOU ENGINE TO A 155cc BEAST SET... MSRP: Now: $74.95 Add to Cart Compare Quick view GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOUR ENGINE TO A 155cc BEAST SET... MSRP: Now: $89.95 Add to Cart Compare Quick view GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS 80cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERSTHIS KIT HAS A 47mm CYLINDER BORE THIS KIT HAS NO CYLINDER HEAD QMB139 47MM PISTON KIT PISTON DIAMETER: 47mm PISTON PIN DIAMETER: 13mm PISTON PIN LENGTH:... MSRP: Now: $19.95 Add to Cart Compare Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view Details GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A MSRP: Now: $89.95 Add to Cart Compare Quick view Details GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS MSRP: Now: $19.95 Add to Cart Compare Quick view Details HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) MSRP: Now: $174.95 Add to Cart Compare Quick view Details NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $232.95 Add to Cart Compare Quick view Details NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) MSRP: Now: $249.95 Add to Cart Compare Quick view Details NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 MSRP: Now: $124.95 Add to Cart Compare Quick view Details NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 MSRP: Now: $124.95 Add to Cart Compare Quick view Details TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) MSRP: Now: $179.95 Add to Cart Compare Quick view Details TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS MSRP: Now: $273.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR MSRP: Now: $264.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON MSRP: Now: $699.95 Add to Cart Compare Quick view GY6 STORE 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOU ENGINE TO A 155cc BEAST SET... MSRP: Now: $74.95 Add to Cart Compare Quick view GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOUR ENGINE TO A 155cc BEAST SET... MSRP: Now: $89.95 Add to Cart Compare Quick view GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS 80cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERSTHIS KIT HAS A 47mm CYLINDER BORE THIS KIT HAS NO CYLINDER HEAD QMB139 47MM PISTON KIT PISTON DIAMETER: 47mm PISTON PIN DIAMETER: 13mm PISTON PIN LENGTH:... MSRP: Now: $19.95 Add to Cart Compare Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view Details GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS MSRP: Now: $19.95 Add to Cart Compare Quick view Details HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) MSRP: Now: $174.95 Add to Cart Compare Quick view Details NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $232.95 Add to Cart Compare Quick view Details NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) MSRP: Now: $249.95 Add to Cart Compare Quick view Details NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 MSRP: Now: $124.95 Add to Cart Compare Quick view Details NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 MSRP: Now: $124.95 Add to Cart Compare Quick view Details TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) MSRP: Now: $179.95 Add to Cart Compare Quick view Details TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS MSRP: Now: $273.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR MSRP: Now: $264.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON MSRP: Now: $699.95 Add to Cart Compare Quick view GY6 STORE 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOU ENGINE TO A 155cc BEAST SET... MSRP: Now: $74.95 Add to Cart Compare Quick view GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOUR ENGINE TO A 155cc BEAST SET... MSRP: Now: $89.95 Add to Cart Compare Quick view GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS 80cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERSTHIS KIT HAS A 47mm CYLINDER BORE THIS KIT HAS NO CYLINDER HEAD QMB139 47MM PISTON KIT PISTON DIAMETER: 47mm PISTON PIN DIAMETER: 13mm PISTON PIN LENGTH:... MSRP: Now: $19.95 Add to Cart Compare Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view Details HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) MSRP: Now: $174.95 Add to Cart Compare Quick view Details NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $232.95 Add to Cart Compare Quick view Details NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) MSRP: Now: $249.95 Add to Cart Compare Quick view Details NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 MSRP: Now: $124.95 Add to Cart Compare Quick view Details NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 MSRP: Now: $124.95 Add to Cart Compare Quick view Details TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) MSRP: Now: $179.95 Add to Cart Compare Quick view Details TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS MSRP: Now: $273.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR MSRP: Now: $264.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON MSRP: Now: $699.95 Add to Cart Compare Quick view GY6 STORE 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOU ENGINE TO A 155cc BEAST SET... MSRP: Now: $74.95 Add to Cart Compare Quick view GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOUR ENGINE TO A 155cc BEAST SET... MSRP: Now: $89.95 Add to Cart Compare Quick view GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS 80cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERSTHIS KIT HAS A 47mm CYLINDER BORE THIS KIT HAS NO CYLINDER HEAD QMB139 47MM PISTON KIT PISTON DIAMETER: 47mm PISTON PIN DIAMETER: 13mm PISTON PIN LENGTH:... MSRP: Now: $19.95 Add to Cart Compare Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view Details NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $232.95 Add to Cart Compare Quick view Details NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) MSRP: Now: $249.95 Add to Cart Compare Quick view Details NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 MSRP: Now: $124.95 Add to Cart Compare Quick view Details NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 MSRP: Now: $124.95 Add to Cart Compare Quick view Details TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) MSRP: Now: $179.95 Add to Cart Compare Quick view Details TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS MSRP: Now: $273.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR MSRP: Now: $264.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON MSRP: Now: $699.95 Add to Cart Compare Quick view GY6 STORE 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOU ENGINE TO A 155cc BEAST SET... MSRP: Now: $74.95 Add to Cart Compare Quick view GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOUR ENGINE TO A 155cc BEAST SET... MSRP: Now: $89.95 Add to Cart Compare Quick view GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS 80cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERSTHIS KIT HAS A 47mm CYLINDER BORE THIS KIT HAS NO CYLINDER HEAD QMB139 47MM PISTON KIT PISTON DIAMETER: 47mm PISTON PIN DIAMETER: 13mm PISTON PIN LENGTH:... MSRP: Now: $19.95 Add to Cart Compare Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view Details NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) MSRP: Now: $249.95 Add to Cart Compare Quick view Details NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 MSRP: Now: $124.95 Add to Cart Compare Quick view Details NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 MSRP: Now: $124.95 Add to Cart Compare Quick view Details TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) MSRP: Now: $179.95 Add to Cart Compare Quick view Details TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS MSRP: Now: $273.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR MSRP: Now: $264.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON MSRP: Now: $699.95 Add to Cart Compare Quick view GY6 STORE 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOU ENGINE TO A 155cc BEAST SET... MSRP: Now: $74.95 Add to Cart Compare Quick view GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOUR ENGINE TO A 155cc BEAST SET... MSRP: Now: $89.95 Add to Cart Compare Quick view GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS 80cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERSTHIS KIT HAS A 47mm CYLINDER BORE THIS KIT HAS NO CYLINDER HEAD QMB139 47MM PISTON KIT PISTON DIAMETER: 47mm PISTON PIN DIAMETER: 13mm PISTON PIN LENGTH:... MSRP: Now: $19.95 Add to Cart Compare Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view Details NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 MSRP: Now: $124.95 Add to Cart Compare Quick view Details NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 MSRP: Now: $124.95 Add to Cart Compare Quick view Details TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) MSRP: Now: $179.95 Add to Cart Compare Quick view Details TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS MSRP: Now: $273.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR MSRP: Now: $264.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON MSRP: Now: $699.95 Add to Cart Compare Quick view GY6 STORE 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOU ENGINE TO A 155cc BEAST SET... MSRP: Now: $74.95 Add to Cart Compare Quick view GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOUR ENGINE TO A 155cc BEAST SET... MSRP: Now: $89.95 Add to Cart Compare Quick view GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS 80cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERSTHIS KIT HAS A 47mm CYLINDER BORE THIS KIT HAS NO CYLINDER HEAD QMB139 47MM PISTON KIT PISTON DIAMETER: 47mm PISTON PIN DIAMETER: 13mm PISTON PIN LENGTH:... MSRP: Now: $19.95 Add to Cart Compare Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view Details NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 MSRP: Now: $124.95 Add to Cart Compare Quick view Details TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) MSRP: Now: $179.95 Add to Cart Compare Quick view Details TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS MSRP: Now: $273.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR MSRP: Now: $264.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON MSRP: Now: $699.95 Add to Cart Compare Quick view GY6 STORE 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOU ENGINE TO A 155cc BEAST SET... MSRP: Now: $74.95 Add to Cart Compare Quick view GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOUR ENGINE TO A 155cc BEAST SET... MSRP: Now: $89.95 Add to Cart Compare Quick view GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS 80cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERSTHIS KIT HAS A 47mm CYLINDER BORE THIS KIT HAS NO CYLINDER HEAD QMB139 47MM PISTON KIT PISTON DIAMETER: 47mm PISTON PIN DIAMETER: 13mm PISTON PIN LENGTH:... MSRP: Now: $19.95 Add to Cart Compare Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view Details TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) MSRP: Now: $179.95 Add to Cart Compare Quick view Details TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS MSRP: Now: $273.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR MSRP: Now: $264.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON MSRP: Now: $699.95 Add to Cart Compare Quick view GY6 STORE 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOU ENGINE TO A 155cc BEAST SET... MSRP: Now: $74.95 Add to Cart Compare Quick view GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOUR ENGINE TO A 155cc BEAST SET... MSRP: Now: $89.95 Add to Cart Compare Quick view GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS 80cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERSTHIS KIT HAS A 47mm CYLINDER BORE THIS KIT HAS NO CYLINDER HEAD QMB139 47MM PISTON KIT PISTON DIAMETER: 47mm PISTON PIN DIAMETER: 13mm PISTON PIN LENGTH:... MSRP: Now: $19.95 Add to Cart Compare Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view Details TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS MSRP: Now: $273.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR MSRP: Now: $264.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON MSRP: Now: $699.95 Add to Cart Compare Quick view GY6 STORE 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOU ENGINE TO A 155cc BEAST SET... MSRP: Now: $74.95 Add to Cart Compare Quick view GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOUR ENGINE TO A 155cc BEAST SET... MSRP: Now: $89.95 Add to Cart Compare Quick view GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS 80cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERSTHIS KIT HAS A 47mm CYLINDER BORE THIS KIT HAS NO CYLINDER HEAD QMB139 47MM PISTON KIT PISTON DIAMETER: 47mm PISTON PIN DIAMETER: 13mm PISTON PIN LENGTH:... MSRP: Now: $19.95 Add to Cart Compare Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view Details TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR MSRP: Now: $264.95 Add to Cart Compare Quick view Details TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON MSRP: Now: $699.95 Add to Cart Compare Quick view GY6 STORE 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOU ENGINE TO A 155cc BEAST SET... MSRP: Now: $74.95 Add to Cart Compare Quick view GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOUR ENGINE TO A 155cc BEAST SET... MSRP: Now: $89.95 Add to Cart Compare Quick view GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS 80cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERSTHIS KIT HAS A 47mm CYLINDER BORE THIS KIT HAS NO CYLINDER HEAD QMB139 47MM PISTON KIT PISTON DIAMETER: 47mm PISTON PIN DIAMETER: 13mm PISTON PIN LENGTH:... MSRP: Now: $19.95 Add to Cart Compare Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view Details TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON MSRP: Now: $699.95 Add to Cart Compare Quick view GY6 STORE 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOU ENGINE TO A 155cc BEAST SET... MSRP: Now: $74.95 Add to Cart Compare Quick view GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOUR ENGINE TO A 155cc BEAST SET... MSRP: Now: $89.95 Add to Cart Compare Quick view GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS 80cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERSTHIS KIT HAS A 47mm CYLINDER BORE THIS KIT HAS NO CYLINDER HEAD QMB139 47MM PISTON KIT PISTON DIAMETER: 47mm PISTON PIN DIAMETER: 13mm PISTON PIN LENGTH:... MSRP: Now: $19.95 Add to Cart Compare Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view GY6 STORE 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOU ENGINE TO A 155cc BEAST SET... MSRP: Now: $74.95 Add to Cart Compare Quick view GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOUR ENGINE TO A 155cc BEAST SET... MSRP: Now: $89.95 Add to Cart Compare Quick view GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS 80cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERSTHIS KIT HAS A 47mm CYLINDER BORE THIS KIT HAS NO CYLINDER HEAD QMB139 47MM PISTON KIT PISTON DIAMETER: 47mm PISTON PIN DIAMETER: 13mm PISTON PIN LENGTH:... MSRP: Now: $19.95 Add to Cart Compare Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view GY6 STORE | sku: TYPE #3 A 58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A GY6STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS58.5mm BORE (NO BORING REQUIRED)TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL WITH THIS NO BORING REQUIRED DROP IN KIT. WITH THIS KIT YOU WILL TAKE YOUR ENGINE TO A 155cc BEAST SET... MSRP: Now: $89.95 Add to Cart Compare Quick view GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS 80cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERSTHIS KIT HAS A 47mm CYLINDER BORE THIS KIT HAS NO CYLINDER HEAD QMB139 47MM PISTON KIT PISTON DIAMETER: 47mm PISTON PIN DIAMETER: 13mm PISTON PIN LENGTH:... MSRP: Now: $19.95 Add to Cart Compare Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS 80cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERSTHIS KIT HAS A 47mm CYLINDER BORE THIS KIT HAS NO CYLINDER HEAD QMB139 47MM PISTON KIT PISTON DIAMETER: 47mm PISTON PIN DIAMETER: 13mm PISTON PIN LENGTH:... MSRP: Now: $19.95 Add to Cart Compare Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view HOCA HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE MINARELLI JOG ENGINES (54MM BORE) HOCA BIG BORE HEAD KIT FOR 90cc 2-STROKE 50QMF, E50QMF, 1E50QMF AND 1PE50QMF MINARELLI ENGINES. 54mm WITH 12mm WRIST PIN, INCLUDES CYLINDER HEAD. WRIST PIN DIAMETER: 12mm WRIST PIN LENGTH: 44mm FITS 1PE50QMB MINARELLI BASED ENGINES WITH... MSRP: Now: $174.95 Add to Cart Compare Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* NARAKU 50cc QMB139 4-STROKE 52.4mm, RACING BIG BORE CYLINDER AND HEAD KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, CYLINDER HEAD, HEAD GASKET, AND BASE GASKET. WHEN USED IN CONJUNCTION WITH A STOCK STROKE OF 41.4mm THE... MSRP: Now: $232.95 Add to Cart Compare Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view NCY NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT KIT INCLUDES: CYLINDER HEAD *50mm* CYLINDER JUG *50mm* GASKET SET WRIST PIN WITH CIR CLIPS PISTON & RINGS THIS IS A DROP IN CYLINDER KIT, NO CRANK CASE... MSRP: Now: $249.95 Add to Cart Compare Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view NCY NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NCY 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE KIT INCLUDES CYLINDER: 47mm BORE *72cc* GASKET SET PISTON WITH PISTON RINGS WRIST PIN CIR CLIPS THIS IS A DROP IN CYLINDER KIT, NO... MSRP: Now: $124.95 Add to Cart Compare Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view NCY | sku: 1100-1237 NCY CYLINDER UPGRADE KIT (81cc, IRON, 50mm BORE) FOR QMB139 NCY GY6 50/QMB139 50MM BORE CAST IRON CYLINDER KIT W/O HEAD. THE PERFECT UPGRADE FOR MOST QMB139/GY6 50 SCOOTERS, THIS BOLT-ON 81cc KIT WILL REALLY GIVE YOUR SCOOTER SOME GO. IT IS RECOMMENDED TO GET PART NUMBER 1100-1239, 50mm BIG VALVE HEAD AS... MSRP: Now: $124.95 Add to Cart Compare Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 MOTORS INCLUDES 28/23 TAIDA CYLINDER HEAD WITH VALVES INSTALLED (FITS:54mm) 58.5mm TAIDA CYLINDER WITH PISTON & PISTON RINGS INSTALLED (CAST... MSRP: Now: $179.95 Add to Cart Compare Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view TAIDA | sku: GY6-01057-67*cFH TAIDA 204cc 67mm GY6 CYLINDER SET FORGED DOME PISTON *57mm SPACING* POLARIS TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED DOME PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED... MSRP: Now: $273.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected × OK
Quick view TAIDA TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR THIS IS TO BE USED WITH STOCK CRANKSHAFT *57.8* INCLUDES CERAMIC 67mm CYLINDER FOR 57mm SPACING *B-BLOCK* FORGED PISTON PISTON... MSRP: Now: $264.95 Add to Cart Compare Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected
Quick view TAIDA TAIDA 204cc POLARIS RAZOR 170 BIG BORE KIT COMPLETE *WITH BORING TOOL* CAST PISTON TAIDA HIGH PERFORMANCE 204cc BIG BORE KIT INCLUDED IN KIT CERAMIC 67mm CYLINDER (CAST) PISTON, RINGS, TOP AND BOTTOM GASKETS WRIST PIN AND CIR CLIPS CYLINDER OD = 69.5mm / ID 67mm CYLINDER 69.3mm HIGH TAIDIA 30.5... MSRP: Now: $699.95 Add to Cart Compare 1 2 Next 1 2 Next Compare Selected