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Polini Corsa for Yamaha Zuma '02-'11 & Yamaha Jog

The Corsa is Polini's revised 70cc sport cylinder. Extreme port timing, polished exhaust port and increased primary compression result in up to 2-3 hp more power as compared to standard 70cc cylinders. The piston is equipped with a chrome and a grey cast iron piston ring. To be able to exploit full power, the cylinder should be used in conjunction with a sport exhaust, or better still a racing exhaust such as Stage6 or Polini ForRace. Also necessary is at least a 17.5 carb to ensure sufficient internal cooling.

Replacement piston

https://www.scooterswapshop.com/products/polin-zuma-replacement-piston