Review on 🛵 Enhance Performance with GOOFIT Big Bore Cylinder Rebuild Kit for GY6 50cc 139QMB Racing Scooter Parts - 64mm Valve Upgrade by Scott Holland

Mounted on Jonway Solana 49cc moped. I've only ridden it a few days but everything installed great and the rocker arm replacement for the 69mm valve was included and installed well too. One alone provides a big power boost, even if all the other parts are stock. I intend to upgrade my carb and exhaust along with it but it already runs like a beast (40+ at part throttle, I'm pretty sure I'll get to 50-60 at full throttle after the engine breaks in). Not sure why the product comes with a stock oil pump mechanism, but it's nice nonetheless. I set both valve clearances to 0.004mm. It works well with a slight click so your moped and mine may need a custom fit.