139qmb gy6-50 80cc Big bore kit 47mm

139qmb gy6-50 80cc Big bore kit 47mm
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  • Item #: 0323-06

This kit includes everything you need to upgrade your 50cc 4stroke to 72cc. Many places commonly call this an 80cc kit. Bore diameter is 47mm. This is over a 60% increase in engine size. Expect overall engine performance to improve almost as much. Great deal. Fits most GY6 scooter ATV 139qmb ( QMB139 ) engines.  Check your engine number on your case. Works great with your stock head, and bolts right up with no modifications. Super deal, no one is lower than this!

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Price $69.95
Availability In-Stock