Home   All Parts   Engine Parts & Diagrams, Scooters-ATVs-Dirt Bikes-GoKarts   Cylinder Heads & Parts, 2 Stroke and 4 Stroke, For 49-260cc Engines   4 stroke GY6 49-180cc, ATVs-Scooters-Go Karts-Motorcycles   GY6 49-80cc (QMB139)   VALVE OD=18.4mm L=69mm , Fits Most GY6, QMB, and Honda Copy 50-125cc engines.