Jianshe PY50 Chipmunk 50cc. Bore up kit - covert the 50cc to a 60cc for extra power. For For Yamaha PW50. New Top End Cylinder Kit Piston Barrel Gasket Head Rings. x2 Piston Rings. x1 Piston Pin. thin one at the top of the piston, any writing on the rings should face upwards.
