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1.Inner Diameter of Cylinder bore: 50mm, Outer Diameter of Piston Pin: 13mm 2.Outer Diameter of Piston: 50mm 3.Easy installation, Upgrade your engine from 50cc to 100cc with more power to climb hill 4.Include Cylinder,Piston,Piston Ring,Piston Pin,Piston Pin Clip,Valve Oil Seal,Gaskets,Tensioner Gasket,Exhaust Gasket,Intake&Exhaust Studs,Exhaust Nut