Save 10% All Week! - 2nd Annual ScooterFest Use Code: SCOOTERFEST17 Some restrictions apply. (Click for details)
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 2nd Annual ScooterFest - Save 10% All Week! 

Use Coupon Code: SCOOTERFEST17


  • Applicable to new orders only.
  • Coupon code must be entered at the time order is placed.
  • This offer ends on August 21st, 2017 at 2:00 AM Eastern Time.
  • Piston for 50cc GY6 139QMB Scooter Engines
    Item: E88-9540
    Piston for 50cc GY6 139QMB Scooter Engines
    All Images © 2017 Monster Scooter Parts
    $ 11 99
    11.99
    Save 10% with code: SCOOTERFEST17
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    Ships Mon, Aug 21st!
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    Product Features
  • Warranty: 30 Days
  • Description
    This is a 39 mm outer diameter piston for 50cc GY6 139QMB scooter engines. The 39 mm piston is a stock size for many Chinese built 50cc GY6 139QMB gas scooter engines, however you should carefully check the dimensions on the Specs tab to see if this is the correct 39 mm outer diameter piston for your scooter.

    The Chinese built 50cc GY6 139QMB engine has been in production by many brands and manufacturers over the years, and it is safe to say that these little pistons are powering millions of scooters around the world.
    Specifications
  • Outer Diameter: 39 mm
  • Overall Height: 33 mm
  • Piston Pin: 13 mm
  • Compression Height: 17.25 mm
  • Circlips included