Quick view Details NCY | sku: 1100-1237, 1100-1239 NCY 81cc *50mm BORE* PERFORMANCE CYLINDER AND HEAD KIT (NON-EGR) MSRP: Now: $249.95 Add to Cart Compare SALE Quick view Details NCY | sku: 1100-1247 NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 MSRP: $135.00 Was: $135.00 Now: $109.95 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 | sku: GY6-01057-67*CF TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR MSRP: Now: $289.85 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 TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) MSRP: Now: $199.95 Out of stock Compare Quick view Details NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $254.95 Add to Cart Compare Quick view Details GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS MSRP: Now: $24.95 Add to Cart Compare Quick view NCY | sku: 1100-1237, 1100-1239 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 SALE Quick view NCY | sku: 1100-1247 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 NCY GY 50/QMB139 47MM BORE, CAST IRON, CYLINDER KIT W/O HEAD OUR MOST POPULAR BIG BORE KIT FOR THE QMB139/GY6 50 SCOOTER ENGINE, THIS BOLT ON 72CC KIT... MSRP: $135.00 Was: $135.00 Now: $109.95 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 | sku: GY6-01057-67*CF 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 FLAT... MSRP: Now: $289.85 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 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: $199.95 Out of stock 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: $254.95 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: $24.95 Add to Cart Compare Previous 1 2 Previous 1 2 Compare Selected × OK
SALE Quick view Details NCY | sku: 1100-1247 NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 MSRP: $135.00 Was: $135.00 Now: $109.95 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 | sku: GY6-01057-67*CF TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR MSRP: Now: $289.85 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 TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) MSRP: Now: $199.95 Out of stock Compare Quick view Details NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $254.95 Add to Cart Compare Quick view Details GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS MSRP: Now: $24.95 Add to Cart Compare Quick view NCY | sku: 1100-1237, 1100-1239 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 SALE Quick view NCY | sku: 1100-1247 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 NCY GY 50/QMB139 47MM BORE, CAST IRON, CYLINDER KIT W/O HEAD OUR MOST POPULAR BIG BORE KIT FOR THE QMB139/GY6 50 SCOOTER ENGINE, THIS BOLT ON 72CC KIT... MSRP: $135.00 Was: $135.00 Now: $109.95 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 | sku: GY6-01057-67*CF 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 FLAT... MSRP: Now: $289.85 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 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: $199.95 Out of stock 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: $254.95 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: $24.95 Add to Cart Compare Previous 1 2 Previous 1 2 Compare Selected × OK
Quick view Details TAIDA | sku: GY6-01057-67*CF TAIDA 204cc GY6 CYLINDER SET WITH 67mm FORGED PISTON (57mm STUD SPACING) POLARIS RAZOR MSRP: Now: $289.85 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 TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) MSRP: Now: $199.95 Out of stock Compare Quick view Details NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $254.95 Add to Cart Compare Quick view Details GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS MSRP: Now: $24.95 Add to Cart Compare Quick view NCY | sku: 1100-1237, 1100-1239 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 SALE Quick view NCY | sku: 1100-1247 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 NCY GY 50/QMB139 47MM BORE, CAST IRON, CYLINDER KIT W/O HEAD OUR MOST POPULAR BIG BORE KIT FOR THE QMB139/GY6 50 SCOOTER ENGINE, THIS BOLT ON 72CC KIT... MSRP: $135.00 Was: $135.00 Now: $109.95 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 | sku: GY6-01057-67*CF 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 FLAT... MSRP: Now: $289.85 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 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: $199.95 Out of stock 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: $254.95 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: $24.95 Add to Cart Compare Previous 1 2 Previous 1 2 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 TAIDA TAIDA 155cc 58.5mm BIG BORE KIT (OD 60.4) HIGH PERFORMANCE FOR GY6 (54mm SPACING) MSRP: Now: $199.95 Out of stock Compare Quick view Details NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $254.95 Add to Cart Compare Quick view Details GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS MSRP: Now: $24.95 Add to Cart Compare Quick view NCY | sku: 1100-1237, 1100-1239 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 SALE Quick view NCY | sku: 1100-1247 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 NCY GY 50/QMB139 47MM BORE, CAST IRON, CYLINDER KIT W/O HEAD OUR MOST POPULAR BIG BORE KIT FOR THE QMB139/GY6 50 SCOOTER ENGINE, THIS BOLT ON 72CC KIT... MSRP: $135.00 Was: $135.00 Now: $109.95 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 | sku: GY6-01057-67*CF 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 FLAT... MSRP: Now: $289.85 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 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: $199.95 Out of stock 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: $254.95 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: $24.95 Add to Cart Compare Previous 1 2 Previous 1 2 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: $199.95 Out of stock Compare Quick view Details NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $254.95 Add to Cart Compare Quick view Details GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS MSRP: Now: $24.95 Add to Cart Compare Quick view NCY | sku: 1100-1237, 1100-1239 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 SALE Quick view NCY | sku: 1100-1247 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 NCY GY 50/QMB139 47MM BORE, CAST IRON, CYLINDER KIT W/O HEAD OUR MOST POPULAR BIG BORE KIT FOR THE QMB139/GY6 50 SCOOTER ENGINE, THIS BOLT ON 72CC KIT... MSRP: $135.00 Was: $135.00 Now: $109.95 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 | sku: GY6-01057-67*CF 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 FLAT... MSRP: Now: $289.85 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 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: $199.95 Out of stock 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: $254.95 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: $24.95 Add to Cart Compare Previous 1 2 Previous 1 2 Compare Selected × OK
Quick view Details NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $254.95 Add to Cart Compare Quick view Details GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS MSRP: Now: $24.95 Add to Cart Compare Quick view NCY | sku: 1100-1237, 1100-1239 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 SALE Quick view NCY | sku: 1100-1247 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 NCY GY 50/QMB139 47MM BORE, CAST IRON, CYLINDER KIT W/O HEAD OUR MOST POPULAR BIG BORE KIT FOR THE QMB139/GY6 50 SCOOTER ENGINE, THIS BOLT ON 72CC KIT... MSRP: $135.00 Was: $135.00 Now: $109.95 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 | sku: GY6-01057-67*CF 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 FLAT... MSRP: Now: $289.85 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 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: $199.95 Out of stock 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: $254.95 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: $24.95 Add to Cart Compare Previous 1 2 Previous 1 2 Compare Selected × OK
Quick view Details GY6 STORE 80cc (47mm BORE) CYLINDER UPGRADE KIT FOR QMB139 MOTORS MSRP: Now: $24.95 Add to Cart Compare Quick view NCY | sku: 1100-1237, 1100-1239 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 SALE Quick view NCY | sku: 1100-1247 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 NCY GY 50/QMB139 47MM BORE, CAST IRON, CYLINDER KIT W/O HEAD OUR MOST POPULAR BIG BORE KIT FOR THE QMB139/GY6 50 SCOOTER ENGINE, THIS BOLT ON 72CC KIT... MSRP: $135.00 Was: $135.00 Now: $109.95 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 | sku: GY6-01057-67*CF 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 FLAT... MSRP: Now: $289.85 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 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: $199.95 Out of stock 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: $254.95 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: $24.95 Add to Cart Compare Previous 1 2 Previous 1 2 Compare Selected × OK
Quick view NCY | sku: 1100-1237, 1100-1239 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 SALE Quick view NCY | sku: 1100-1247 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 NCY GY 50/QMB139 47MM BORE, CAST IRON, CYLINDER KIT W/O HEAD OUR MOST POPULAR BIG BORE KIT FOR THE QMB139/GY6 50 SCOOTER ENGINE, THIS BOLT ON 72CC KIT... MSRP: $135.00 Was: $135.00 Now: $109.95 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 | sku: GY6-01057-67*CF 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 FLAT... MSRP: Now: $289.85 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 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: $199.95 Out of stock 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: $254.95 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: $24.95 Add to Cart Compare Previous 1 2 Previous 1 2 Compare Selected × OK
SALE Quick view NCY | sku: 1100-1247 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 NCY GY 50/QMB139 47MM BORE, CAST IRON, CYLINDER KIT W/O HEAD OUR MOST POPULAR BIG BORE KIT FOR THE QMB139/GY6 50 SCOOTER ENGINE, THIS BOLT ON 72CC KIT... MSRP: $135.00 Was: $135.00 Now: $109.95 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 | sku: GY6-01057-67*CF 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 FLAT... MSRP: Now: $289.85 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 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: $199.95 Out of stock 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: $254.95 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: $24.95 Add to Cart Compare Previous 1 2 Previous 1 2 Compare Selected × OK
Quick view TAIDA | sku: GY6-01057-67*CF 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 FLAT... MSRP: Now: $289.85 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 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: $199.95 Out of stock 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: $254.95 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: $24.95 Add to Cart Compare Previous 1 2 Previous 1 2 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 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: $199.95 Out of stock 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: $254.95 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: $24.95 Add to Cart Compare Previous 1 2 Previous 1 2 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: $199.95 Out of stock 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: $254.95 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: $24.95 Add to Cart Compare Previous 1 2 Previous 1 2 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: $254.95 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: $24.95 Add to Cart Compare Previous 1 2 Previous 1 2 Compare Selected
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: $24.95 Add to Cart Compare Previous 1 2 Previous 1 2 Compare Selected