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I don’t notice any change as I alter the air screws. Definitely runs richer set anything less than 3 1/2 turns out. It was on pod filters so no shortage of air.
I understand why you’d say that. However I can’t imagine it would be possible to make a bendy guitar string go through a hole which was smaller than it. Anyhow, I’ve replaced the slow idle jets with 38’s and balanced the carbs. It’s much improved but coughs a bit going up the road, lacking power. Once revs are at about 3500 it’s much better. That’d be Main jet though at that stage. The exhaust still indicates running rich, any attempt to put a filter in the airbox makes that worse. I’m contemplating dropping the needle to lean that off, currently needles are on the middle setting. Vacuum gauges are on about 8 inches which if I’ve converted correctly equates to the book 16-24 cm HG
There is a lot of overlap of jets when going from idle jets to main jets, so at 3500 rpm it could be either jet. Nigel (K2-K6) posted a brilliant graph showing the overlap but i can't find it again now. Also, as long as the vacuum gauges are showing parity, it doesn't matter what the reading is within reason.