Polini offers a so called Big Valve carburetor kit for most of the scooters which are originally only equipped with a 2-petal reed block. The kit consists of a reed valve with 4 petals, a 21mm Dellorto carburetor, as well as the respective intake manifold. Thanks to the considerably increased intake cross-section of the 4-petal reed valve and a bigger bore carburetor, you have the advantage of greater cylinder filling and the engine's performance is better throughout the whole power band