QMB139 50mm Performance Cylinder and Head Kit. Includes cylinder, piston, piston rings, wrist pin, cir clips, complete cylinder head with 64mm valves, exhaust gasket, intake gasket, and cam chain tensioner gasket.
When used in conjunction with your stock crankshaft the displacement comes out to 82cc.
Please note: replaces Cylinder Heads with 64mm Valves (Short Valve Style). Please see Related Items if you need 64mm rocker arms.
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