Cylinder Kit w/Head, 69mm Valves for 50cc 4-Stroke 139QMB Scooters

39mm Cylinder Kit with Non-EGR Head for 50cc 4-Stroke 139QMB Scooters

SPECIFICATIONS:

• Cylinder Bore: 39mm
• Cylinder Sleeve Outer Diameter: 45mm (39mm Bore)
• Wrist Pin Diameter: 13mm
• Total Piston Height: 34.4mm
• Compression Height (from center of wrist pin hole to top edge of piston): 17.25mm
• Intake and Exhaust Valve Length: 69mm
• Non-Emissions Head

There are two types. One has a shorter head and 64mm valve stem length. This one has a longer head and 69mm valve stem length.

**NOTE: PLEASE CHECK TO SEE WHICH LENGTH VALVES YOUR SCOOTER USES BEFORE PLACING AN ORDER!