Polini has become the leader in Italian racing cylinder kits.  Their entry level Contessa options are relitively easy to install, tune, and improve the performance of your scooter.  This 72cc kit for Minarelli-based 50cc horizontal engines with a 12mm wrist pin is the ideal starter big bore kit for someone looking to get significant gain without excess tuning time.

This kit will also fit on many addtional minarelli based engines like:

• CPI Scooters (Various Models)
• Eton 50cc Models
• Keeway 50cc Models
• Maluguti (Various Models)
• Other 50cc 2-stroke 1PE40QMB Based Chinese Scooters

Don't forget to properly break in your big bore kit and add about an ounce of 2 stroke oil to your gas tanks.  50cc oil injectors are not meant to lubricate 72cc bores.  For break in, we recommend 200-300 mile before running your bike full throttle for any extensive length of time.

 replacement wrist pin circlips can be found here

*This kit will has a 12mm wrist pin.  Please confirm your model before purchase.*

*All big bore kits are non returnable and have no warranty*

Not legal for use in California on pollution controlled vehicles. Check local laws before installing.

This product is not intended for use on public roads or land.