58.5mm Bore Cylinder with Gaskets and Piston for GY6 150cc to 155cc 4 Stroke Engine 152QMI 157QMJ Scooter Moped Go Kart ATV This cylinder kit is designed for use with GY6 engines ranging from 150cc to 155cc.It includes a 58.5mm bore cylinder, piston, and necessary gaskets for complete installation.The components are compatible with 4 stroke engines commonly found in , mopeds, go karts, and ATVs.The piston fits standard connecting rods and ensures proper compression when installed.This kit replaces worn or damaged cylinders and pistons to restore engine performance.All parts are engineered to meet specifications for fit and function. This is a non- replacement.Any reference to brand names or models is strictly for compatibility purposes.