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50cc QMB139 4-stroke 50mm, Non Emissions Cylinder Head with 69mm Valves for use with 81.3cc Big Bore Kit! (See Related Items)
*You may need to modify your engine case to accommodate the larger cylinder.
- For Use With 81.3cc Big Bore Kit
- Valve Length: 69mm
- Overall Height: 59.5mm
- Intake Port Diameter: 18mm
- Exhaust Port Diameter: 17mm
- Intake Bolt Hole Spacing: 44.5mm
- Exhaust Bolt Hole Spacing: 50mm
Supported ModelsQMB139 50cc/49cc , Various unlisted makes/models
Important Parts Notice: Not all replacement or upgrade parts come with instructions. It is the customer's responsibility to have common knowledge of the 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 non returnable and the buyer assumes all risks.
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