Big Bore Kits & Cylinder Kits for Full-Size Street Scooters

47mm QMB139 Cylinder Kit
47mm QMB139 Cylinder Kit
Part #: 151-255
Price: $ 59.99
50cc QMB139 4-stroke 47mm, Performance Cylinder Kit. Upgrades to 72cc!
Hoca 50mm QMB139 Performance Cylinder Kit
Hoca 50mm QMB139 Performance Cylinder Kit
Part #: 169-54
Price: $ 114.99
Hoca 50cc QMB139 4-stroke 50mm, Racing Big Bore Cylinder Set.
Universal Parts GY6 150cc 57.4mm Cylinder Kit
Universal Parts GY6 150cc 57.4mm Cylinder Kit
Part #: 164-308
Price: $ 49.99
Universal Parts 57.4mm Stock Cylinder Kit for 150cc GY6 4-stroke engines.
SSP-G GY6 180cc Power Kit
SSP-G GY6 180cc Power Kit
Part #: 169-99
Price: $ 449.99
SSP-G 180cc Big Bore Power Kit Scooter Part for 150cc and 125cc 4-stroke GY6 Engines. This complete Power Pack comes with a 63mm bored out Cylinder and matching Machined out Crankcase...
Universal Parts QMB139 39mm Cylinder Kit
Universal Parts QMB139 39mm Cylinder Kit
Part #: 151-257
Price: $ 49.99
Universal Parts 39mm Stock Cylinder Kit for 50cc 4-stroke QMB139 engines.
SSP-G Cylinder Set for 180cc Power Kit
SSP-G Cylinder Set for 180cc Power Kit
Part #: 169-172
Price: $ 144.99
Cylinder Set for 180cc Power Kit
Universal Parts Minarelli 40mm Cylinder & Head Kit
Universal Parts Minarelli 40mm Cylinder & Head Kit
Part #: 161-226
Price: $ 69.99
Universal Parts 40mm Stock Cylinder and Head Kit for 50cc 2-stroke Minarelli 1PE40QMB Jog engines. Includes 10mm Piston Pin.
Morini 41mm Cylinder Kit
Morini 41mm Cylinder Kit
Part #: 185-1
Price: $ 79.99
41mm Cylinder Kit for Morini AD50 engines commonly found on Hyosung, Suzuki and TGB Street Scooters.
SSP-G 47mm Kymco 2-Stroke AC Big Bore Cylinder Kit
SSP-G 47mm Kymco 2-Stroke AC Big Bore Cylinder Kit
Part #: 169-405
Price: $ 149.99
SSP-G 47mm 2-Stroke Air-Cooled Big Bore Cylinder Kit for the Kymco Cobra 50, Super 8 50, Super 9 50, People 50, Like 50, Yup 50 and many more.
TB60 Big Bore Kit
TB60 Big Bore Kit
Part #: 169-185
Price: $ 49.99
Big Bore Cylinder Kit for 50cc 2-stroke TB50 1DE41QMB engines.
SSP-G 52mm QMB139 Performance Cylinder Kit
SSP-G 52mm QMB139 Performance Cylinder Kit
Part #: 169-342
Price: $ 124.99
SSP-G 50cc QMB139 4-stroke 52mm, Racing Big Bore Cylinder Set.
SSP-G 70cc 2-stroke Big Bore Kit - 10mm Piston Pin
SSP-G 70cc 2-stroke Big Bore Kit - 10mm Piston Pin
Part #: 169-57
Price: $ 149.99
SSP-G 47mm Big Bore Cylinder set for 50cc 2-stroke Minarelli engines found on many popular 2-stroke full size scooters and ATVs. Upgrades to a 70cc.
SSP-G GY6 58mm Big Bore Kit
SSP-G GY6 58mm Big Bore Kit
Part #: 169-314
Price: $ 119.99
SSP-G 58mm Big Bore Kit for 150cc and 125cc GY6 4-stroke engines and engine based vehicles.
Hoca 39mm Kymco 2-Stroke AC Cylinder Kit
Hoca 39mm Kymco 2-Stroke AC Cylinder Kit
Part #: 169-404
Price: $ 129.99
Hoca 39mm 2-Stroke Air-Cooled Cylinder Kit for the Kymco Cobra 50, Super 8 50, Super 9 50, People 50, Like 50, Yup 50 and many more.
Universal Parts GY6 63mm Big Bore Cylinder Kit
Universal Parts GY6 63mm Big Bore Cylinder Kit
Part #: 164-310
Price: $ 79.99
Universal Parts 63mm Big Bore Cylinder Kit for 150cc GY6 4-stroke engines. Upgrades to 180cc based on a stock stroke of 57.8mm!
Universal Parts GY6 61mm Big Bore Cylinder Kit
Universal Parts GY6 61mm Big Bore Cylinder Kit
Part #: 164-309
Price: $ 69.99
Universal Parts 61mm Big Bore Cylinder Kit for 150cc GY6 4-stroke engines. Upgrades to 169cc based on a stock stroke of 57.8mm!
Hoca Morini 47mm Big Bore Cylinder Kit
Hoca Morini 47mm Big Bore Cylinder Kit
Part #: 185-10
Price: $ 129.99
Hoca 47mm Big Bore Cylinder Kit for Morini AD50 engines commonly found on Hyosung, Suzuki and TGB Street Scooters.
Morini 47mm Big Bore Cylinder Kit
Morini 47mm Big Bore Cylinder Kit
Part #: 185-6
Price: $ 99.99
47mm Big Bore Cylinder Kit for Morini AD50 engines commonly found on Hyosung, Suzuki and TGB Street Scooters.
Universal Parts QMB139 50mm Big Bore Cylinder Kit
Universal Parts QMB139 50mm Big Bore Cylinder Kit
Part #: 151-258
Price: $ 69.99
Universal Parts 50mm Big Bore Cylinder Kit for 50cc 4-stroke QMB139 engines. Upgrades to 81.3cc based on a stock stroke of 41.4mm!
SSP-G 47mm Minarelli Vertical 70cc Big Bore Kit
SSP-G 47mm Minarelli Vertical 70cc Big Bore Kit
Part #: 169-451
Price: $ 149.99
SSP-G 47mm Big Bore Cylinder set for 50cc 2-stroke Minarelli Vertical engines commonly found on 1988-2001 Yamaha Zuma/CW 50cc Scooters. Upgrades to a 70cc.
Universal Parts Minarelli 47mm Big Bore Cylinder Kit
Universal Parts Minarelli 47mm Big Bore Cylinder Kit
Part #: 161-227
Price: $ 89.99
Universal Parts 47mm Big Bore Cylinder Kit for 50cc 2-stroke Minarelli 1PE40QMB Jog engines. Includes 12mm Piston Pin. Upgrades to 68cc!
Hoca 70cc 2-stroke Big Bore Kit - 12mm Piston Pin
Hoca 70cc 2-stroke Big Bore Kit - 12mm Piston Pin
Part #: 169-153
Price: $ 149.99
Hoca 47mm Big Bore Head Kit for 50cc 2-stroke 40QMB, E40QMB, 1E40QMB and 1PE40QMB Minarelli engines.
Charmo 54mm Minarelli Big Bore Kit
Charmo 54mm Minarelli Big Bore Kit
Part #: 169-154
Price: $ 149.99
Charmo Big Bore Head Kit for 90cc 2-stroke 50QMF, E50QMF, 1E50QMF and 1PE50QMF Minarelli engines. 54mm with 12mm wrist pin, includes cylinder head.
SSP-G Zuma 50F Big Bore Cylinder & Head Kit - 47mm
SSP-G Zuma 50F Big Bore Cylinder & Head Kit - 47mm
Part #: 169-452
Price: $ 449.99
SSP-G 47mm Big Bore Cylinder and Head Kit for the Yamaha Zuma 50F 4 Stroke Liquid Cooled Scooter and many other makes and models. Upgrades to 75.6cc!
Universal Parts Minarelli 50mm Cylinder Kit
Universal Parts Minarelli 50mm Cylinder Kit
Part #: 161-228
Price: $ 99.99
Universal Parts 50mm Stock Cylinder Kit for 90cc 2-stroke Minarelli 1E50QMF Jog engines. Includes 12mm Piston Pin.
Hoca 63mm Honda Grom Big Bore Cylinder Kit
Hoca 63mm Honda Grom Big Bore Cylinder Kit
Part #: 169-432
Price: $ 249.99
Hoca 63mm 4-Stroke Big Bore Cylinder Kit for the Honda Grom 125. Upgrades to 180cc!!!