Valve - Big Bore kit - 50mm/100cc Large for 49cc/50cc 139QMB Scooter

Upgrade your 49cc/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.

Specifications

• The cylinder has a 50mm bore, giving you 100cc of power. The intake valve diameter is 23mm, and the exhaust valve diameter is 20mm.
• Cylinder 50mm
• Head with larger valves (Intake Valve Diameter 23mm / Exhaust Valve Diameter 20mm)
• Cylinder Bore: 50mm / 100cc
• Intake Valve Diameter 23mm
• Exhaust Valve Diameter 20mm
• Valve Length: 69mm
• Piston: 50mm / 100cc
• 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
• 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.