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Polini has become the leader in Italian racing cylinder kits.
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.
Polini Cast Iron 70cc 47mm Big Bore Cylinder Kit for 50cc 2 Stroke Air Cooled Minarelli Based Scooters with 12mm Wrist pin
Polini Part Number 166.0108