Up for sale here is a genuine Dellorto main jet for all ME carburetors.  Three sizes available that give you a good, correct range for running these carburetors.  These are genuine Dell'Orto jets, obtained from Cosmopolitan Motors who was the exclusive Dell'Orto importer for the US in the 1960s and 1970s.  

Popular vintage motorcycles, scooters and mopeds that these are correct for include; Wards Benelli, Sears Gilera, Harley Davisdon Aermacchi, Ducati, Laverda, Morini, VESPA, Laverda, PUCH, and many many more.

Again, these are genuine Dellorto jets, guaranteed to be precision drilled and tested at Dellorto in Italy.  Do not mistake other poorly made Chinese jets for the real thing!