reed valve Polini Oversize Big Evolution for Aprilia, Derbi, Gilera, Piaggio, Vespa 213.0055

Big Evolution diaphragm block from Polini - more air, more fuel, more power!

The diaphragm block is made of vulcanized rubber and equipped with 0.3mm thick carbon diaphragm plates. This makes it particularly resistant to fuel and high operating temperatures.

Notes:

• Polini recommends the installation of a 24-28 carburetor.
.
• To be able to mount the diaphragm block, the engine case must be modified.