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Fits ATV: This is the perfect kit for a rebuild or you can upgrade your 125cc to a 150cc. Chinese Scooter Parts Engine Rebuild Kit for The GY6 150cc Chinese Scooters£¬ Fits the 157QMJ Engines with the EGR Head, 76mm Bolt Pattern 2 1/2" Tall Head , Kit comes with Complete EGR Cylinder Head with Valves already assembled, Cylinder Kit 57mm Bore (stock 150cc) Piston Kit with Rings, Wrist Pin, & Cir Clips, New Intake & Exhaust Studs, Roller Weights, Engine Gasket Set as Pictured, Note This kit is the 76mm Bolt Pattern Cylinder & Head, Will not Fit the 80mm Bolt Pattern.