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6 Yrs
22, Ekkamai 2, Sukhumvit 63
Bangkok, Bangkok-10110, Thailand+(66)-2-3910066
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Big Bore Cylinder

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This is a kit for upgrading your 50cc scooters to 80cc offering better and stronger power.

This kit is for most of Chinese 139QMB Scooters. Kit includes

  • Cylinder Head
  • Cylinder
  • Piston
  • Piston Ring
  • Piston Pin
  • Clips
  • Gasket
  • Base Gasket

Please note that Jet Size of Carburetor need to be changed as well.

  • Upgrades to 80cc
  • Cylinder Bore: 50mm
  • Wrist Pin Diameter: 13mm
  • Total Piston Height: 34.8mm
  • Compression Height (from center of wrist pin hole to top edge of piston): 18.3mm
  • Please see below for measurements.


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