GY6 150cc Motorcycle Piston Cylinder Kit 57.4mm Piston Ring Pin Ring Gasket Set for 4 stroke Scooter ATV Engine Spare Parts This piston and ring set is designed for GY6-150 4 stroke 150cc scooter and ATV engines. The kit includes a piston with a diameter of 57.4mm and an overall height of 38.5mm. The wrist pin measures 15mm in diameter and 42mm in length. Components such as piston rings and gaskets are included to support complete cylinder assembly. This set serves as a replacement part for engine rebuilds and maintenance. Compatibility Disclaimer: This is an aftermarket replacement part. Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.