If you have the time and / or are retired . Anything is possible.
Lets all stand by for his next project
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Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStopPerformance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn
There is a brass idle air jet at the mouth of the venturi on the later VM28's circa late '74Z1 and all '75 Z1, the ones with the small drain screw. The brass jet is just upstream of the idle mix screw. The orifice of the brass jet is fairly large, guessing .035 or so if calibrated eyeball isn't failing. Should be able to see a tiny portion of the tapered end of the idle mix screw using good light & maybe some magnification.
The earlier earlier VM28's circa '72 through late '74 Z1, the ones with the large drain plug, have no brass idle air jet.
Note that Mama Kaw/Mikuni changed the taper of the idle air screw concurrent with the myriad of other changes made to the late-74/all '75 VM28's.
slmjim & Z1BEBE
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.