Base gasket for Chinese scooter engine 139QMA

This base gasket is for Chinese 139QMA scooter.

It is designed for GY6 4-stroke engines type 139QMA.

This base gasket is intended for engines having a piston with the following dimensions :
- shaft diameter: 13mm,
- Piston diameter: 38.4 mm (diameter taken from the rings),
- Piston diameter: 39 mm (diameter taken from the bottom of the piston),
- Piston height: 31.6 mm.