Some vintage Vespas came with plugged idle jets, which have no air hole. These are available in sizes 42, 45 and 50.
Jetting is something that takes trial and error. See our blog page for more info.
Idle Jet (#50); SHA, SHB Carb
Carburetor / Fuel System
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Engine, (150 cc non-injected 5 port) ; no electric start
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