Cylinder Kit Polini Corsa 70 12Mm Pin Minarelli Vertical

Polini Corsa 70cc cylinder kit The "Corsa" is Polini's modified, more powerful version of their 70cc sport cylinder, here for Yamaha BW's / MBK Booster or other 50cc scooters with Minarelli vertical engine. Technical data Polini Corsa: Cast iron cylinder, bore = 47mm, with 5 transfer ports and single, oval outlet 2-ring piston, 12mm piston pin High-compression cylinder head, aluminum Gasket set 2x carbon reed petals 0.30mm for original reed valve Performance Polini Corsa 70: Slightly longer port timings, larger port cross-sections and higher compression significantly increase the performance of this cast iron cylinder. The "Corsa" delivers an outstanding performance, especially at high rpms, and is very durable on top of that. With the right configurationn (carburetor with at least 17.5 mm diameter, reinforced crankshaft and racing exhaust), the Corsa can deliver 10 to 11 hp. The Polini Corsa is not approved for road use. ATTENTION: For this model with 12mm pin you need a crankshaft with a connecting rod with 12mm small end bearing.