Big Bore Kits & Cylinder Kits

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.
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.
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.
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!
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.
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 CN250 75mm Big Bore Cylinder Kit
Hoca CN250 75mm Big Bore Cylinder Kit
Part #: 169-394
Price: $ 224.99
Hoca CN250 75mm Big Bore Cylinder Kit for 250cc 4-stroke water-cooled V3/V5 engines found on street-legal scooters, ATVs, Dune Buggies and much more. Upgrades to 265cc! Includes cylinder, piston, piston pin, rings, circlips, head gasket and base gasket. *
Hoca Minarelli Ceramic Big Bore Racing Kit - 10mm Pin
Hoca Minarelli Ceramic Big Bore Racing Kit - 10mm Pin
Part #: 169-331
Price: $ 199.99
Hoca 47.6mm Ceramic Big Bore Racing Kit w/ Nikasil Coating for 50cc 2-stroke Minarelli engines found on many popular Street Scooters & ATVs. Upgrades to a 70cc!
Hoca 4-Valve Cylinder Head Kit GY6
Hoca 4-Valve Cylinder Head Kit GY6
Part #: 169-167
Price: $ 299.99
Hoca 4-Valve Cylinder Head Kit Honda
Hoca GY6 63mm Big Bore Cylinder Kit
Hoca GY6 63mm Big Bore Cylinder Kit
Part #: 169-53
Price: $ 149.99
Hoca, 63mm Big Bore Cylinder Kit for 150cc and 125cc GY6 4-stroke engines and engine based vehicles.
Hoca GY6 Ceramic Big Bore Kit
Hoca GY6 Ceramic Big Bore Kit
Part #: 169-277
Price: $ 169.99
Hoca 58.5mm Ceramic Big Bore Kit with Nikasil Cylinder Coating for 150cc and 125cc GY6 4-stroke engines and engine based vehicles.
Hoca GY6 61mm Big Bore Cylinder Kit
Hoca GY6 61mm Big Bore Cylinder Kit
Part #: 169-173
Price: $ 144.99
Hoca 61mm Big Bore Cylinder Kit for 150cc and 125cc GY6 4-stroke engines and engine based vehicles. Upgrades to 169cc!
Hoca 54mm Minarelli Big Bore Kit - Tall
Hoca 54mm Minarelli Big Bore Kit - Tall
Part #: 169-340
Price: $ 175.99
Hoca Big Bore Head Kit for 90cc 2-stroke Minarelli engines. This kit should be used with the Hoca 45mm Stroker Crank for optimal performance!
Hoca Jog 90cc Liquid-Cooled Cylinder Kit
Hoca Jog 90cc Liquid-Cooled Cylinder Kit
Part #: 169-165
Price: $ 289.99
Hoca Jog Liquid Cooled Cylinder Kit size 53 x 42 mm for 90cc 2-stroke 50QMF, E50QMF, 1E50QMF and 1PE50QMF Minarelli engines.
Hoca Minarelli Ceramic Big Bore Racing Kit - 12mm Pin
Hoca Minarelli Ceramic Big Bore Racing Kit - 12mm Pin
Part #: 169-385
Price: $ 199.99
Hoca 47.6mm Ceramic Big Bore Racing Kit with Nikasil Coating for 50cc 2-stroke Minarelli engines. Upgrades to a 70cc!
Hoca GY6 Ceramic Big Bore Kit
Hoca GY6 Ceramic Big Bore Kit
Part #: 169-278
Price: $ 206.99
Hoca 63mm Ceramic Big Bore Kit with Nikasil Cylinder Coating for 150cc and 125cc GY6 4-stroke engines and engine based vehicles.
47cc and 49cc 2-Stroke Performance Cylinder Kit
47cc and 49cc 2-Stroke Performance Cylinder Kit
Part #: 107-67
Price: $ 109.99
Complete 44mm Cylinder Kit for the 47cc / 49cc Reed induction engine. This engine comes on Cag and Daytona Pocket Bikes, Pocket Quads and Small Dirt Bikes. You can choose from 10mm or 12mm Piston Pin Option.
Universal Parts GY6 Cylinder and Head Kit
Universal Parts GY6 Cylinder and Head Kit
Part #: 164-319
Price: $ 89.99
Universal Parts Cylinder and Head Kit for 150cc GY6 4-stroke engines. 57.4mm or 61mm bore sizes.