Valve - Big Bore kit - 50mm/100cc Large EGR/PAIR - 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

• Made for the 49cc/50cc, 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.
• 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

• It fits the 49cc/50cc, 139QMB engine with EGR / PAIR system only.
• 139QMB 49cc/50cc 4-Stroke scooters

Product Details

• The kit also features an EGR/PAIR pulse breather hole designed to lower emissions and comply with environmental regulations.
• 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.
• This kit has an EGR / PAIR pulse breather hole built into the exhaust flow port. It's designed to control emissions by lowering HC and CO emissions.
• Piston, rings, pin and clips
• HP Cam A9
• Gaskets and Hardware
• This kit is NOT recommended for inexperienced installers. It is highly recommend that it's install by an experienced scooter or motorcycle mechanic. The valves will require adjusting and the timing must be properly set.