Cylinder Kit 125cc for China 4-stroke GY6 125 152QMI125cc Cylinder kit for all 125cc 4 stroke Chinese scooters which use the GY6 152QMI enginesAn ideal low cost replacement kit for those worn or damaged top endsKit is supplied with required top end gaskets, barrel, piston, rings, pin and clipsIf purchasing this kit for the Sym 125cc scooters, please ensure your engine is the GY6 version (cylinder head stud holes have a distance of 63mm hole to hole, outside to outside measurement)Specification: Piston pin: 15mm - Piston diameter: 52mm - Bore: 52.4mm - Height d cylinder: 69mm . - Overall height D cylinder: 90mm