Modern Vespa : Carb Jet atop air filter cover

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OP LudsVes UTC details Lurker P125X Joined: UTC Posts: 3 Location: Tucson
OP LudsVes Lurker P125X Joined: UTC Posts: 3 Location: Tucson	UTC quote Given a 1978 Vespa, model P150X. Carburetor is SI20-20D. Atop carb air filter cover is what appears to be a spring loaded carb jet. Any idea what it is as I have found to such item in manuals.

ridinhigh UTC details Hooked vespa gts 300i super Joined: UTC Posts: 326 Location: England uk
ridinhigh Hooked vespa gts 300i super Joined: UTC Posts: 326 Location: England uk	UTC quote is it a choke ?for starting

OP LudsVes UTC details Lurker P125X Joined: UTC Posts: 3 Location: Tucson
OP LudsVes Lurker P125X Joined: UTC Posts: 3 Location: Tucson	UTC quote No. Choke found to be in usual location. This jet is the longest of all the carbs jet and enters the lower portion of the carb near the slider