Home   All Parts   Engine Parts & Diagrams, Scooters-ATVs-Dirt Bikes-GoKarts   GY6 49cc-100cc (QMB139), Parts Fit Most Chinese, 49-80cc Scooters   High Performance Parts, 49 - 100cc GY6-QMB Scooters   High Performance Parts, 49cc-100cc Sold Separately   100cc Cylinder Piston Top End Kit With Non-EGR Head For GY6-50 QMB139 Chinese Scooter Motors. Bore=50mm Shirt OD=52.50mm