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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. The cylinder kit includes, cylinder, piston, rings, wrist pin and gaskets. The head has preinstalled valves so doing this upgrade is a snap.