100cc(GY6 Big Bore) high performance cylinder kit for 50cc GY6 139QMB scooter engines.This scooter upgrade kit is a high-quality kit that is perfect for upgrading your old 50cc 139QMB engine to 100cc so you don't get left behind in today's fast paced world. Installing this upgrade kit will increase your engine bore size to 100cc. Included in this kit is an aluminum cylinder, piston, piston rings, and gaskets.After installation, you will see an immediate increase in low end acceleration and an increase in top speed!Call Dan

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