Vespa Piaggio Polini 4 Stud Reed Valve Race Cases - CDI cvt Excellent performing pipe

Excellent performing pipe

- High durability

resulting in less power lost due to heat

This pipe will greatly increase low end acceleration and moderately increase top speed

Even though these are incredibly rare in the United States

Vespa Piaggio Polini 4 Stud Reed Valve Race Cases - CDI cvt Excellent performing pipe4 stud, reed valve engine from Polini for Vespa Ciao, Bravo, Grande, Si, etc These cases feature both 3 and 4 stud options so there are lots of choices there. They even left the rotary intake intact so you can block that off or use it. Comes with a block off plate for that. This is for CDI, not points. You have to use the factory CDI or the Polini ignition with these cases. These cases are set up for the 46mm kits. Can you use the smaller cylinders?