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50cc 4-stroke QMB139 scooter complete engine assembly. Short case .

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50cc 4-stroke QMB139 complete engine assembly. Short crankcase version.

Engine is set up for PAIR Emissions System. 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.

Please Read The Following Important Notices:

  • This engine is shipped dry, included oil not installed. Includes 1 Liter of Bel-Ray Gear Saver Hypoid Oil 80W-90 and 1 Liter of Bel-Ray EXL Mineral 4T Engine Oil 10W-40. DO NOT RUN ENGINE WITHOUT ADDING SPECIFIED AMOUNTS OF OIL.
  • Check oil level after letting the engine idle for a few minutes, add additional oil if needed.


  • Set Up For Drum Brakes


In stock (20 items available)
  • $329.99
  • SKU
  • Output Shaft Length: 54mm
  • CVT Cover (short case): 16 inches
  • Set up for drum brake
  • Set Up for PAIR Emissions System
  • 8 Pole A/C Stator
  • Includes Premium Bando Drive Belt & NGK Spark Plug
  • Engine Oil: 0.8 Liters
  • Gear Oil: 0.12 Liters (filling) and 0.10 Liters (changing) 
  • Shipped Dry, Included Oil Not Installed - Do NOT Run Engine Without Adding Specified Amounts of Oil (Bel-Ray Oil Included)
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