Big Bore kit - 47mm/80cc - 49cc,139QMB

Upgrade your 50cc scooter to achieve more acceleration and top speed with a 47mm/80cc Big Bore Kit. This kit includes everything you need, including the A9 Cam and Rocker Arms assembly. No more guessing games with valve measurements, as we have thoughtfully included the rocker arms assembly to ensure compatibility.

With fast shipping and hassle-free returns, Pitmoto is the brand you can trust for high-quality scooter upgrades.

Please note that this kit is not recommended for inexperienced installers and should be installed by an experienced scooter or motorcycle mechanic. The valves will require adjusting, and the timing must be set correctly. Failure to correctly set the timing can result in catastrophic engine damage.