View All Big Bore Kits & Upgrades
Cylinder Block Assembly - 50cc - 125cc, 54mm - 20A8451 - PBC1627F1
Engines & Engine Parts, Top Ends, Cylinder Block & Head, Big Bore Kits & Upgrades
$107.79
Cylinder assembly most commonly used for (but not limited to) 50cc to 125cc engines, increase your power up to 125cc. 53.9mm piston.
Piston: 53.9mm
Wrist Pin: 13mm diameter
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Cylinder Block Assembly - Big Bore, 200cc to 250cc, 65.5mm, 14pc - 20A8910 - PBC1741F1
Engines & Engine Parts, Top Ends, Cylinder Block & Head, Big Bore Kits & Upgrades
$146.99
Cylinder Assembly, aluminum alloy, most commonly used for (but not limited to) 200cc to 250cc engines. 65.5mm piston.
Assembly Includes:
30A8175 Piston and Ring Set
GSK2020 Head Gasket Se...
Cylinder Block Assembly - Big Bore, GY6, 50cc to 110cc, 50mm, 12pc - 20A8950 - PBC1603F1
Engines & Engine Parts, Top Ends, Cylinder Block & Head, Big Bore Kits & Upgrades
$146.99
Cylinder Assembly, aluminum alloy, most commonly used for (but not limited to) GY6 50cc to 110cc engines. 50mm piston.
Assembly Includes:
30A8650 Piston and Ring Set
Head Gasket Set
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Cylinder Block Assembly - Big Bore, GY6, Performance, 61mm - 20A8970 - PBC1522F1
Engines & Engine Parts, Top Ends, Cylinder Block & Head, Big Bore Kits & Upgrades
$146.99
Performance Cylinder Assembly Most Commonly Used for (but not limited to) GY6 150cc engines, 61mm piston.
Most GY6 engines need to be bored out for the sleeve of this larger performance part to fit...
Cylinder Block Assembly - Big Bore, YBR, 125cc to 150cc, 58mm, 14pc - 20A8905 - PBC1654F1
Engines & Engine Parts, Top Ends, Cylinder Block & Head, Big Bore Kits & Upgrades
$293.99
Cylinder Assembly, aluminum alloy, most commonly used for (but not limited to) YBR 125cc engines, extending the power output from 125cc to 150cc. 58mm piston.
Assembly Includes:
30A8167 Pist...
Cylinder Block Assembly - GY6, 125cc to 150cc, 58.5mm, 12pc - 20A8960 - PBC1768F1
Engines & Engine Parts, Top Ends, Cylinder Block & Head, Big Bore Kits & Upgrades
$97.99
Cylinder Assembly, aluminum alloy, most commonly used for (but not limited to) GY6 125cc to 150cc engines. 58.5mm piston.
Associated Parts:
20A8897 Cylinder Head
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Cylinder Head Assembly - 44mm, Big Bore, Pocket Bike, Blue - 20P8440BU - PBC1727F1
Engines & Engine Parts, Big Bore Kits & Upgrades
$117.59
44mm 'big bore' cylinder & piston kit for 44-6 2-stroke engines.
44mm big-bore kit for '47cc' chinese import pocketbikes with case reed inducted engine. For example, stock bore on the '47cc' en...
Cylinder Head Assembly - 44mm, Big Bore, Pocket Bike, Gold - 20P8440GD - PBC1546F1
Engines & Engine Parts, Big Bore Kits & Upgrades
$117.59
44mm 'big bore' cylinder & piston kit for 44-6 2-stroke engines.
44mm big-bore kit for '47cc' chinese import pocketbikes with case reed inducted engine. For example, stock bore on the '47cc' en...
Cylinder Head Assembly - 44mm, Big Bore, Pocket Bike, Red - 20P8440RD - PBC1572F1
Engines & Engine Parts, Big Bore Kits & Upgrades
$117.59
44mm 'big bore' cylinder & piston kit for 44-6 2-stroke engines.
44mm big-bore kit for '47cc' chinese import pocketbikes with case reed inducted engine. For example, stock bore on the '47cc' en...
Cylinder Head Assembly - Big Bore, CNC, Dual Valve, Pocket Bike, 49cc, Air Cooled - 20P8490BU - PBC1755F1
Engines & Engine Parts, Big Bore Kits & Upgrades
$137.19
Big bore head CNC kit for 44-6 2-Stroke Engines. Commonly used for pocket bike / mini bike 49cc air cooled products. This is a dual valve high compression unit. CNC Blue.
44mm big-bore kit for 47cc...
Cylinder Head Assembly - Big Bore, CNC, Dual Valve, Pocket Bike, 49cc, Air Cooled - 20P8490GD - PBC1599F1
Engines & Engine Parts, Big Bore Kits & Upgrades
$137.19
Big bore head CNC kit for 44-6 2-Stroke Engines. Commonly used for pocket bike / mini bike 49cc air cooled products. This is a dual valve high compression unit. CNC Gold.
44mm big-bore kit for 47cc...
Cylinder Head Assembly - Big Bore, CNC, Dual Valve, Pocket Bike, 49cc, Air Cooled - 20P8490RD - PBC1624F1
Engines & Engine Parts, Big Bore Kits & Upgrades
$137.19
Big bore head CNC kit for 44-6 2-Stroke Engines. Commonly used for pocket bike / mini bike 49cc air cooled products. This is a dual valve high compression unit. CNC Red.
44mm big-bore kit for 47cc ...
Cylinder Head Assembly - Blata Origami Performance Upgrade - 20D8460 - PBC1466F1
Engines & Engine Parts, Big Bore Kits & Upgrades
$123.02
This performance cylinder & piston kit will upgrade your water cooled Blata Origami from 39cc to 46cc....
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Cylinder Head Assembly - Complete, 800cc, UTV, Hisun - 20A9050 - PBC1805F1
Engines & Engine Parts, Big Bore Kits & Upgrades, Top Ends, Cylinder Block & Head
$489.99
800cc cylinder head / engine head complete assembly. Commonly used for (but not limited to) 800cc engines, such as the Hisun 800cc UTVs, as well as many other clones, rebrands and similar displacement...
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