Description:Cylinder 52.4mm Bore (stock 125cc-150cc) Piston Kit with Rings， Wrist Pin， & Cir ClipsNew Intake & Exhaust Studs， Oil Pump & Gear， Roller Weights，Engine Gasket Set as Pictured， This is the perfect kit for a rebuild or you can upgrade your 125cc to a 150cc.GY6 150cc Scooter Engines With 76mm Bolt Pattern.Fixed up model: Motorcycle scooter GY6 125cc-150cc Package including: 1 x Cylinder body1 x Piston1 x Set gasket1 x Set ring