Main jets come in various sizes ranging 37-88. This main jet is compatible with Dellorto SHA / SHB carburetors for Vespa small frames with 16mm and 19mm carbs, also fits PHBG carbs.
Jetting is something that takes trial and error. See our blog page for Jetting Instructions and more info.
Jet (Main,#43) Dellorto,SHA,SHB,PHBG
Carburetor / Fuel System
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