Universal Parts Complete QMB139 Cylinder Head – Emissions


LogoUniversal Parts Completely Assembled PAIR Style Cylinder Head for 50cc 4-stroke QMB139 engines.

PAIR is an acronym for Pulsed Secondary Air Injection System. It is an emissions control system used to lower HC and CO emissions. It works by allowing air into the exhaust flow.

34 in stock

SKU: 151-240 Category:


  • Intake Port Diameter: 17mm
  • Exhaust Port Diameter: 17mm
  • Valve Length: 69mm
  • Emission Control System: Pulsed Secondary Air Injection System(PAIR)

Additional information

Weight 2.4 lbs