IT'S A MONSTER MONTH OF SAVINGS! - 20% OFF ALL ACCESSORIES (Click for details)
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20% Off All Accessories!


This offer is valid October 22th, 2017 through October 29nd at 2:00am EST.
  • Applicable to new orders only.
  • No coupon code required. Savings are automatically applied to the purchase price.
  • Discount does not include shipping charges.
  • Excludes used and "Scratch and Dent" Items. Other exclusions may apply.
  • 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
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    Product Features
    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