Home   All Parts   Engine Parts & Diagrams, Scooters-ATVs-Dirt Bikes-GoKarts   GY6 49cc-100cc (QMB139), Parts Fit Most Chinese, 49-80cc Scooters   Cylinder, Piston, & Crankshaft   60cc (High Performance 44mm) Piston Kit. Fits GY6-50 Chinese Scooter Motors. PIN=13mm H=32.4 Ctr Pin To Top=17.4mm