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81cc High Performance Cylinder Kit for 50cc GY6 139QMB Scooter Engines Bladez Moby S If it does then we81cc high performance cylinder kit for 50cc GY6 139QMB scooter engines, by manufacturer NCY. This scooter upgrade kit is a high quality kit that is perfect for upgrading your old 50cc 139QMB engine to 81cc so you dont get left behind in todays fast paced world. Installing this upgrade kit will increase your engine bore size to 81cc, and includes an aluminum cylinder, 50 mm piston, piston rings, and gaskets. After installation, you will see an