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100cc Cylinder kit and head (50mm)

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Part Number: 17-2-2
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This is a complete top end kit for 50cc Chinese scooters with the 139QMB engine. Commonly called the 100cc big bore kit it has a piston that measures 50mm in diameter. Head has 69mm valves and is EGR. The cylinder kit includes, cylinder, piston, rings, wrist pin and gaskets. The head has preinstalled valves so doing this upgrade is a snap.