GOOFIT Big Bore Cylinder Rebuild Kit for GY6 50cc 139QMB Racing Scooter Parts 64mm Valve
- It can be Only Used for GY6 4stroke 49cc 50cc engine upgrade.
- Easy installation with video instruction,you can visit the video on our facebook homepage and Youtube..
- Best way to get more RPM,maximum upgrade kit for GY6 50cc 139QMB engine and 1P39QMB Engine..
- Valve Length 64mm ,does not for 69mm one.
- The Belt Cover/CVT Cover Gasket is for a Short Case Version.