[Product Information]

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• 1.Please note this kit is only used for GY6 139QMB 4-Stroke Engine.
• 2.Inner Diameter of Cylinder: 50mm
• 3.Outer Diameter of Piston Pin: 13mm
• 4.Include Cylinder，Piston，Piston Ring，Piston Pin，Piston Pin Clip，Valve Oil Seal，Gaskets，Tensioner Gasket，Exhaust Gasket，Intake&Exhaust Studs，Exhaust Nut
• 5. High Performance Upgrade 50mm Cylinder Rebuild Kit for GY6 49cc 50cc 60cc 80cc 100cc engine