Polini Corsa for Yamaha Zuma '02-'11 & Yamaha JogThe 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 4Race. Also necessary is