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Air Screw as far as I can tell
Just experimented on another Mikuni of exact same model (My Spare) and screwed and unscrewed the air screw in and out and blew into the air pilot in the venturi tube edge, and you could tell (though hard to tell and ever so slightly different) by listening to the air escape the tiny port behind the needle jet (about 3/8" behind it) and the intersection of the rear of the slide and the bottom curve of carb tunnel, with finger covering and uncovering the tiny port you could hear the difference in air flow. So I'm pretty sure this is an air screw.
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