Complete Valve Assembly; CSC Go., QMB139 OEM Chicago Scooter Company cylinder head for the Go. and Go. Max scooters. and Includes valves, valve springs, and seals fully installed. and Will also fit many addtional QMB139 scooters including Tao Tao, Wolf, Bintelli, Ice Bear, Jonway, and more. fits bikes with 64mm valves.Product is intended as OEM equivalent for listed models. Any misuse, alteration or alternative application is prohibited by law.