Big Bore kit - 50mm/100cc Large Valve (EGR/PAIR) - for 49cc,139QMB

Upgrade your 50cc scooter to reach higher speeds and improved acceleration with Pitmoto's Big Bore Kit - 50mm/100cc. This comprehensive kit includes everything you need for a seamless installation, 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.

The kit also features an EGR/PAIR pulse breather hole designed to lower emissions and comply with environmental regulations.

Made for the 49cc, 139QMB engine with EGR/PAIR system, this kit comes with a Cylinder, Piston, rings, pin and clips, and a Head with larger valves (Intake Valve Diameter 23mm / Exhaust Valve Diameter 20mm). It also includes the HP Cam A9 and all the necessary gaskets.

With Pitmoto's Big Bore Kit - 50mm/100cc, you can expect an upgrade in performance and speed. 

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.