Description:

Fit for Upgrade GY6 50cc 4-stroke 139QMB engines. SpecificationCylinder bore:50mm, Cylinder head:50mm, Piston pin:13mm, 64mm valve, it will make the GY6 50cc engine more power to climb hill.. Parts includedCylinder head comp, cylinder body, piston, piston pin, piston ring, pin clip, valve rockers, oil pump, oil sprockets, the whole gaskets, roller, Bolt..