Chinese Scooter Parts. QMB139 Cylinder Rebuild Kits, Piston Parts for Chinese Scooters and Mopeds.

Our high quality Cylinder Rebuild Kits are the exact replacement part for many Chinese manufactured brands and models of Chinese ATVs, Dirt Bikes, Go Karts and Scooters. This Chinese Engine Part fits many models and makes of Chinese Engines.

Fits GY6 50cc Scooter Engines Only

See pictures in Engine hard parts to identify your engine

Chinese Engine Cylinder Rebuild Kit - 50cc engines. Piston measures approximately 39mm in diameter - GY6 50cc Engines.

Our Cylinder Rebuild Kits ship complete with cylinder body/jug, piston,  piston rings, piston pin, piston circlips, and Top End Rebuild Gasket Set.

There is a FREE top end rebuild guide for the GY6 engine located in our Chinese ATv Repair Manual Section.