44mm (66.1cc) aluminum sport cylinder kit for 4-stroke Yamaha Zuma, C3, and Genuine Venture 50cc scooters. Kit includes cylinder, piston, rings, piston pin, cir clips, dowel pins, intake tube, fuel pressure regulator, and gaskets.
When you use this 44mm big bore kit in conjunction with your stock crankshaft you will increase your total displacement to 66.1cc!
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*You may need to modify your engine case to accommodate the larger cylinder.