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Engineered specifically as an upgraded replacement for 125cc to 170cc 4-stroke CVTs
yellow (single)
resulting in faster
Material: Low-friction nylon composite
Replace a cracked or worn cylinder head on your 150cc engine with this Blue Line OEM-spec 57
Transmission Upgrade Kit; 139QMB 170i Engineered specifically as an upgradedThis NCY transmission kit for most 139QMB GY50 style 50 cc (4T) Chinese scooters is the highest quality OEM replacement kit available anywhere, and that will allow your transmission to run smoother, longer, and more efficiently. You'll never have rollers flatten out on you after 200 miles or have your drive face cut up your belt ever again. Manufactured in Taiwan, these components are the best you can buy today, and pay for themselves in saved service
