65.5mm Cylinder Piston Kit 65.5mm For Zongshen ZS200 CG 200 250 ATV Quad DirtBike 250cc65. 5mm Cylinder Piston Gasket Top End Rebuild Kit For Chinese ATV Quad Dirt Bike 250cc CG200 CG250 Features: If your cylinder blows through, the compression is too low, or even a piston seizure has occurred, then this kit is exactly the right thing for you. Kit includes cylinder, forged piston, rings, pin, clips & top end gasket kit (you get exactly what is pictured). The cylinder is made of aluminum for good cooling with an internal cast iron jacket