Polini Big Valve reed box with intake manifold d=21-25mm

The Polini BigValve conversion kit has been developed to allow the installation of large reed valve boxes on engines that originally come with 1 or 2-petal reed valve boxes.

With a larger diameter, more fuel enters the crankcase, which provides increased performance.
This is noticeable throughout the entire rev range.
The kit includes a reed valve box, an intake manifold, and the necessary mounting material.
On Minarelli vertical models, the Polini reed valve box has 2 petals; on Peugeot/Honda models, the Polini reed valve box has 4 petals.
Suitable for Dellorto and Arreche carburettors from 12-21mm.