UD Racing Upgrade Kit 50cc for Polini 911 (type 2)

This kit only fits engines of Polini 911 Pocket Bikes.

This kit will replace the piston of 36mm diameter by a piston of 40mm diameter and will increase the engine displacement to 50cc.

This complete kit allows for greater responsiveness, torque and top speed.

This is the only kit with such a low price!

Warning: this kit can only be mounted on Polini 911 Pocket Bikes with the cooling inlet on the side of the intake pipe.

Included:
- 1x 5 transfer ports cylinder,
- 1x cylinder head,
- 1x gasket set,
- 1x piston kit (40mm piston, 10mm wrist pin)