Cylinder Kit 40.5mm for 50cc Yamaha PW50 Engine 133764 This replacement seat is used

This replacement seat is used on several brands of full size atvs

25 threaded mounting holes

Rear clutch for 70-125cc engine

Drive face center hole: 19 teeth (spline shaft)

Cylinder Kit 40.5mm for 50cc Yamaha PW50 Engine 133764 This replacement seat is usedChinese 40. 5mm Cylinder Kit for 50cc Yamaha PW50 Engine. This Chinese 40. 5mm cylinder kit is the replacement part for the Yamaha PW50 dirt bike. Cylinder kits ship complete with cylinder, 40. 5mm piston, piston rings, piston pin, piston clips, and top end gasket set. This kit fits the Yamaha PW50 50cc models. Cylinder kit description: Top end gasket set included [as pictured] Piston kit also included [as pictured] Piston Height: 50mm approx. Piston