Home   All Parts   Engine Parts & Diagrams, Scooters-ATVs-Dirt Bikes-GoKarts   GY6 49cc-100cc (QMB139), Parts Fit Most Chinese, 49-80cc Scooters   Cylinder Head - Valves, Camshaft-Covers-Parts   VALVE OD=18.4mm L=69mm , Fits Most GY6, QMB, and Honda Copy 50-125cc engines.