Hoca 50mm QMB139 Performance Cylinder Kit

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Item Description

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

Please see our Warranty & Returns Policy.

We recommend that you use our QMB139 performance cylinder head (see Related Items) with this set as some stock cylinder heads will not fit. Use with an un-modified stock head can cause serious engine damage.

*You may need to modify your engine case to accommodate the larger cylinder.

• Upgrades to 80cc
• Cylinder Bore: 50mm
• Cylinder Sleeve Outer Diameter: 54.9mm
• Wrist Pin Diameter: 13mm
• Total Piston Height: 34.8mm
• Compression Height (from center of wrist pin hole to top edge of piston): 18.3mm

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Important Parts Notice:  Not all replacement or upgrade parts come with instructions. It is the customer's responsibility to have common knowledge of installation or hire an experienced installer. We are not responsible for any damage that may be caused by any of the items we sell, whether installed by you or a professional. We are not required to provide step by step instructions or technical support. In any case, we will always do our best to help you with any technical question you may have. Electrical parts are none returnable and buyer assumes all risks. 

Important Notes

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