This is a kit for upgrading your 50cc scooters to 80cc offering better and stronger power.
This kit is for most of Chinese 139QMB Scooters. Kit includes
- Cylinder Head
- Piston Ring
- Piston Pin
- Base Gasket
Please note that Jet Size of Carburetor need to be changed as well.
- 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.