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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