Easy installation: You can install this kit directly to your GY6 125cc -150cc engine

This Cylinder fits the 76mm Bolt Pattern Engine, It will not work on the 80mm Bolt Pattern

Inner Diameter of Cylinder: 58.5mm and Outer Diameter of Piston Pin: 15mm

High Quality Durable Piston Rings

Include Cylinder,Piston,Piston Ring,Piston Pin,Piston Pin Clip,Valve Oil Seal,Gaskets,Tensioner Gasket,Exhaust Gasket,Intake&Exhaust Studs,Exhaust Nut