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50cc QMB139, Performance Cylinder Kit

50cc QMB139, Performance Cylinder Kit
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Item #:169-54

50cc QMB139 4-stroke 50mm, Racing Big Bore Cylinder Set. Kit includes cylinder, piston, rings, piston pin, cir clips, head gasket, and base gasket.

We recommend that you use our part #169-70 cylinder head with this set as some stock cylinder heads will not fit.

  • 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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