Quick view Details NARAKU | sku: NK100.47 NARAKU CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 MSRP: Now: $92.00 Add to Cart Compare SALE Quick view Details NCY | sku: 1100-1248 NCY BIG BORE CYLINDER KIT (52mm BORE, 88cc) FOR QMB139 50cc ENGINES MSRP: $140.00 Was: $140.00 Now: $130.00 Add to Cart Compare Quick view Details TAIDA | sku: GY650-01052 TAIDA 52mm (88cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON MSRP: Now: $79.95 Out of stock Compare Quick view Details TAIDA | sku: GY650-01050 TAIDA 50mm (81cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON MSRP: Now: $80.73 Add to Cart Compare 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 Quick view Details NCY | sku: 1100-1247 NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 MSRP: Now: $134.95 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 NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $291.00 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 NARAKU | sku: NK100.47 NARAKU CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NARAKU 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE UPGRADES TO 72cc CYLINDER BORE: 47mm CYLINDER SLEEVE OUTER DIAMETER: 53.1mm WRIST PIN DIAMETER: 13mm TOTAL PISTON HEIGHT: 34... MSRP: Now: $92.00 Add to Cart Compare SALE Quick view NCY | sku: 1100-1248 NCY BIG BORE CYLINDER KIT (52mm BORE, 88cc) FOR QMB139 50cc ENGINES 52mm PERFORMANCE BIG BORE CYLINDER KIT BY NCY FOR 50cc OR LARGER QMB139 ENGINES 50cc QMB139 4-STROKE 52mm, RACING BIG BORE CYLINDER SET. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN,... MSRP: $140.00 Was: $140.00 Now: $130.00 Add to Cart Compare Quick view TAIDA | sku: GY650-01052 TAIDA 52mm (88cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 88cc (52mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (52mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $79.95 Out of stock Compare Quick view TAIDA | sku: GY650-01050 TAIDA 50mm (81cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 81cc (50mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (50mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $80.73 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 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: Now: $134.95 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 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: $291.00 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: 1100-1248 NCY BIG BORE CYLINDER KIT (52mm BORE, 88cc) FOR QMB139 50cc ENGINES MSRP: $140.00 Was: $140.00 Now: $130.00 Add to Cart Compare
Quick view Details TAIDA | sku: GY650-01052 TAIDA 52mm (88cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON MSRP: Now: $79.95 Out of stock Compare Quick view Details TAIDA | sku: GY650-01050 TAIDA 50mm (81cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON MSRP: Now: $80.73 Add to Cart Compare 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 Quick view Details NCY | sku: 1100-1247 NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 MSRP: Now: $134.95 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 NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $291.00 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 NARAKU | sku: NK100.47 NARAKU CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NARAKU 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE UPGRADES TO 72cc CYLINDER BORE: 47mm CYLINDER SLEEVE OUTER DIAMETER: 53.1mm WRIST PIN DIAMETER: 13mm TOTAL PISTON HEIGHT: 34... MSRP: Now: $92.00 Add to Cart Compare SALE Quick view NCY | sku: 1100-1248 NCY BIG BORE CYLINDER KIT (52mm BORE, 88cc) FOR QMB139 50cc ENGINES 52mm PERFORMANCE BIG BORE CYLINDER KIT BY NCY FOR 50cc OR LARGER QMB139 ENGINES 50cc QMB139 4-STROKE 52mm, RACING BIG BORE CYLINDER SET. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN,... MSRP: $140.00 Was: $140.00 Now: $130.00 Add to Cart Compare Quick view TAIDA | sku: GY650-01052 TAIDA 52mm (88cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 88cc (52mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (52mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $79.95 Out of stock Compare Quick view TAIDA | sku: GY650-01050 TAIDA 50mm (81cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 81cc (50mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (50mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $80.73 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 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: Now: $134.95 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 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: $291.00 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: GY650-01050 TAIDA 50mm (81cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON MSRP: Now: $80.73 Add to Cart Compare 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 Quick view Details NCY | sku: 1100-1247 NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 MSRP: Now: $134.95 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 NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $291.00 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 NARAKU | sku: NK100.47 NARAKU CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NARAKU 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE UPGRADES TO 72cc CYLINDER BORE: 47mm CYLINDER SLEEVE OUTER DIAMETER: 53.1mm WRIST PIN DIAMETER: 13mm TOTAL PISTON HEIGHT: 34... MSRP: Now: $92.00 Add to Cart Compare SALE Quick view NCY | sku: 1100-1248 NCY BIG BORE CYLINDER KIT (52mm BORE, 88cc) FOR QMB139 50cc ENGINES 52mm PERFORMANCE BIG BORE CYLINDER KIT BY NCY FOR 50cc OR LARGER QMB139 ENGINES 50cc QMB139 4-STROKE 52mm, RACING BIG BORE CYLINDER SET. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN,... MSRP: $140.00 Was: $140.00 Now: $130.00 Add to Cart Compare Quick view TAIDA | sku: GY650-01052 TAIDA 52mm (88cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 88cc (52mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (52mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $79.95 Out of stock Compare Quick view TAIDA | sku: GY650-01050 TAIDA 50mm (81cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 81cc (50mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (50mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $80.73 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 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: Now: $134.95 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 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: $291.00 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 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 Quick view Details NCY | sku: 1100-1247 NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 MSRP: Now: $134.95 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 NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $291.00 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 NARAKU | sku: NK100.47 NARAKU CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NARAKU 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE UPGRADES TO 72cc CYLINDER BORE: 47mm CYLINDER SLEEVE OUTER DIAMETER: 53.1mm WRIST PIN DIAMETER: 13mm TOTAL PISTON HEIGHT: 34... MSRP: Now: $92.00 Add to Cart Compare SALE Quick view NCY | sku: 1100-1248 NCY BIG BORE CYLINDER KIT (52mm BORE, 88cc) FOR QMB139 50cc ENGINES 52mm PERFORMANCE BIG BORE CYLINDER KIT BY NCY FOR 50cc OR LARGER QMB139 ENGINES 50cc QMB139 4-STROKE 52mm, RACING BIG BORE CYLINDER SET. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN,... MSRP: $140.00 Was: $140.00 Now: $130.00 Add to Cart Compare Quick view TAIDA | sku: GY650-01052 TAIDA 52mm (88cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 88cc (52mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (52mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $79.95 Out of stock Compare Quick view TAIDA | sku: GY650-01050 TAIDA 50mm (81cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 81cc (50mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (50mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $80.73 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 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: Now: $134.95 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 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: $291.00 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 NCY | sku: 1100-1247 NCY CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 MSRP: Now: $134.95 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 NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $291.00 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 NARAKU | sku: NK100.47 NARAKU CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NARAKU 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE UPGRADES TO 72cc CYLINDER BORE: 47mm CYLINDER SLEEVE OUTER DIAMETER: 53.1mm WRIST PIN DIAMETER: 13mm TOTAL PISTON HEIGHT: 34... MSRP: Now: $92.00 Add to Cart Compare SALE Quick view NCY | sku: 1100-1248 NCY BIG BORE CYLINDER KIT (52mm BORE, 88cc) FOR QMB139 50cc ENGINES 52mm PERFORMANCE BIG BORE CYLINDER KIT BY NCY FOR 50cc OR LARGER QMB139 ENGINES 50cc QMB139 4-STROKE 52mm, RACING BIG BORE CYLINDER SET. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN,... MSRP: $140.00 Was: $140.00 Now: $130.00 Add to Cart Compare Quick view TAIDA | sku: GY650-01052 TAIDA 52mm (88cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 88cc (52mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (52mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $79.95 Out of stock Compare Quick view TAIDA | sku: GY650-01050 TAIDA 50mm (81cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 81cc (50mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (50mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $80.73 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 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: Now: $134.95 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 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: $291.00 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 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 NARAKU | sku: 137-4 NARAKU SCOOTER PERFORMANCE BIG BORE CYLINDER & HEAD KIT *52.4mm* MSRP: Now: $291.00 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 NARAKU | sku: NK100.47 NARAKU CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NARAKU 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE UPGRADES TO 72cc CYLINDER BORE: 47mm CYLINDER SLEEVE OUTER DIAMETER: 53.1mm WRIST PIN DIAMETER: 13mm TOTAL PISTON HEIGHT: 34... MSRP: Now: $92.00 Add to Cart Compare SALE Quick view NCY | sku: 1100-1248 NCY BIG BORE CYLINDER KIT (52mm BORE, 88cc) FOR QMB139 50cc ENGINES 52mm PERFORMANCE BIG BORE CYLINDER KIT BY NCY FOR 50cc OR LARGER QMB139 ENGINES 50cc QMB139 4-STROKE 52mm, RACING BIG BORE CYLINDER SET. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN,... MSRP: $140.00 Was: $140.00 Now: $130.00 Add to Cart Compare Quick view TAIDA | sku: GY650-01052 TAIDA 52mm (88cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 88cc (52mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (52mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $79.95 Out of stock Compare Quick view TAIDA | sku: GY650-01050 TAIDA 50mm (81cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 81cc (50mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (50mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $80.73 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 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: Now: $134.95 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 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: $291.00 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: $291.00 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 NARAKU | sku: NK100.47 NARAKU CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NARAKU 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE UPGRADES TO 72cc CYLINDER BORE: 47mm CYLINDER SLEEVE OUTER DIAMETER: 53.1mm WRIST PIN DIAMETER: 13mm TOTAL PISTON HEIGHT: 34... MSRP: Now: $92.00 Add to Cart Compare SALE Quick view NCY | sku: 1100-1248 NCY BIG BORE CYLINDER KIT (52mm BORE, 88cc) FOR QMB139 50cc ENGINES 52mm PERFORMANCE BIG BORE CYLINDER KIT BY NCY FOR 50cc OR LARGER QMB139 ENGINES 50cc QMB139 4-STROKE 52mm, RACING BIG BORE CYLINDER SET. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN,... MSRP: $140.00 Was: $140.00 Now: $130.00 Add to Cart Compare Quick view TAIDA | sku: GY650-01052 TAIDA 52mm (88cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 88cc (52mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (52mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $79.95 Out of stock Compare Quick view TAIDA | sku: GY650-01050 TAIDA 50mm (81cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 81cc (50mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (50mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $80.73 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 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: Now: $134.95 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 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: $291.00 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 NARAKU | sku: NK100.47 NARAKU CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NARAKU 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE UPGRADES TO 72cc CYLINDER BORE: 47mm CYLINDER SLEEVE OUTER DIAMETER: 53.1mm WRIST PIN DIAMETER: 13mm TOTAL PISTON HEIGHT: 34... MSRP: Now: $92.00 Add to Cart Compare SALE Quick view NCY | sku: 1100-1248 NCY BIG BORE CYLINDER KIT (52mm BORE, 88cc) FOR QMB139 50cc ENGINES 52mm PERFORMANCE BIG BORE CYLINDER KIT BY NCY FOR 50cc OR LARGER QMB139 ENGINES 50cc QMB139 4-STROKE 52mm, RACING BIG BORE CYLINDER SET. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN,... MSRP: $140.00 Was: $140.00 Now: $130.00 Add to Cart Compare Quick view TAIDA | sku: GY650-01052 TAIDA 52mm (88cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 88cc (52mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (52mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $79.95 Out of stock Compare Quick view TAIDA | sku: GY650-01050 TAIDA 50mm (81cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 81cc (50mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (50mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $80.73 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 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: Now: $134.95 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 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: $291.00 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: NK100.47 NARAKU CYLINDER UPGRADE KIT (72cc, IRON, 47mm BORE) FOR QMB139 NARAKU 72cc BIG BORE CYLINDER KIT FOR CHINESE SCOOTERS THIS KIT HAS A 47mm CYLINDER BORE UPGRADES TO 72cc CYLINDER BORE: 47mm CYLINDER SLEEVE OUTER DIAMETER: 53.1mm WRIST PIN DIAMETER: 13mm TOTAL PISTON HEIGHT: 34... MSRP: Now: $92.00 Add to Cart Compare SALE Quick view NCY | sku: 1100-1248 NCY BIG BORE CYLINDER KIT (52mm BORE, 88cc) FOR QMB139 50cc ENGINES 52mm PERFORMANCE BIG BORE CYLINDER KIT BY NCY FOR 50cc OR LARGER QMB139 ENGINES 50cc QMB139 4-STROKE 52mm, RACING BIG BORE CYLINDER SET. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN,... MSRP: $140.00 Was: $140.00 Now: $130.00 Add to Cart Compare Quick view TAIDA | sku: GY650-01052 TAIDA 52mm (88cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 88cc (52mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (52mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $79.95 Out of stock Compare Quick view TAIDA | sku: GY650-01050 TAIDA 50mm (81cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 81cc (50mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (50mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $80.73 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 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: Now: $134.95 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 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: $291.00 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: 1100-1248 NCY BIG BORE CYLINDER KIT (52mm BORE, 88cc) FOR QMB139 50cc ENGINES 52mm PERFORMANCE BIG BORE CYLINDER KIT BY NCY FOR 50cc OR LARGER QMB139 ENGINES 50cc QMB139 4-STROKE 52mm, RACING BIG BORE CYLINDER SET. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN,... MSRP: $140.00 Was: $140.00 Now: $130.00 Add to Cart Compare
Quick view TAIDA | sku: GY650-01052 TAIDA 52mm (88cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 88cc (52mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (52mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $79.95 Out of stock Compare Quick view TAIDA | sku: GY650-01050 TAIDA 50mm (81cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 81cc (50mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (50mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $80.73 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 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: Now: $134.95 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 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: $291.00 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: GY650-01050 TAIDA 50mm (81cc) QMB139 CYLINDER SET (54mm SPACING) WITH CAST PISTON TAIDA HIGH PERFORMANCE 81cc (50mm) CYLINDER SET FOR 54mm SPACING INCLUDES CYLINDER JUG (50mm) 54mm SPACING *A-BLOCK* GASKET SET CAST PISTON PISTON RINGS WRIST PIN & CLIPS EVERYTHING IN THE PHOTOS OD:... MSRP: Now: $80.73 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 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: Now: $134.95 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 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: $291.00 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 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: Now: $134.95 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 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: $291.00 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: 1100-1247 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: Now: $134.95 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 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: $291.00 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 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 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: $291.00 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: $291.00 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
