Motorcycle 44mm head gasket and base gasket designed for 4 stroke 50cc 60cc scooter, moped, ATV, and QUAD engines. Compatible with 139QMB, GY6 60, and GY6 60CC engine models. This gasket set includes both head and base gaskets to ensure proper sealing between the cylinder head and engine block. Suitable for use in standard engine rebuilds and maintenance. Made to fit common 44mm bore applications in small displacement four-stroke engines. Compatibility Disclaimer: This is an aftermarket replacement part. Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.