This is for the Dellorto 13.13 SHA carburetor for Vespa, Piaggio and Kinetic mopeds.. Excellent upgrade for stock and larger cc cylinders. Comes with a 66 main jet. Too rich for stock 50cc. About right for larger 60cc-70cc engines. Best to pick up a range of jets to tune for your application.
Intake ID = 16mm
Air filter= 50mm