Universal Parts 50mm QMB139 Non Emissions Head – 69mm Valves


Logo50cc QMB139 4-stroke 50mm, Non Emissions Cylinder Head with 69mm Valves for use with 81.3cc Big Bore Kit! (See Related Items)

*You may need to modify your engine case to accommodate the larger cylinder.

19 in stock

SKU: 151-266 Category:


  • For Use With 81.3cc Big Bore Kit
  • Valve Length: 69mm
  • Overall Height: 59.5mm
  • Intake Port Diameter: 18mm
  • Exhaust Port Diameter: 17mm
  • Intake Bolt Hole Spacing: 44.5mm
  • Exhaust Bolt Hole Spacing: 50mm

Additional information

Weight 2.4 lbs