Big Bore kit - 47mm/80cc - 49cc/50cc 139QMB Scooter

Upgrade your 49cc/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.

Specifications

• Cylinder 47mm
• Cylinder Bore: 47mm / 80cc
• Valve Length: 69mm
• Piston: 47mm / 80cc
• Piston Pin: 13mm
• Bolt Hole Spacing: 50mm (center to center)
• Cam Bearings: 16002/P6 (32mm diameter)
• Cam Sprocket: 34 tooth

Compatible With

• Fits the 49cc/50cc 139QMB engine.
• 139QMB 49cc/50cc 4-Stroke scooters

Product Details

• 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.
• Piston, rings, pin and clips
• Head with valves
• HP Cam A9
• Gaskets and Hardware
• This kit is NOT recommended for inexperienced installers. It is highly recommended that an experienced scooter or motorcycle mechanic installs it. The valves will require adjusting and the timing must be properly set.