The theory is that the air screw will increase/decrease the revs and they'll peak when you reach the optimum setting on the air screw. If the revs peak between 1 and 2.5 turns you have the right pilot. If its less than 1 turn out you need a richer pilot. Further than 2.5 out and you need a leaner pilot. If you change the pilot you are meant to set the air screw at 1.5 and repeat.
To be honest I find this circuit really sensitive on the gasser where it will only really start easily and idle well when you have the right pilot jet in it, which is why my personal method is to set the AS at 1.5, the slide a few mm open only, and then change pilots until it starts and idles. Then you can set the idle and air screw all within a half a turn in either direction.
Remember increasing the idle by raising the slide will also allow more air to pull through so may need more fuel to sustain the idle as well. Thats why the stock needle always ends up with everyone screwing the idle in deep. To lean things out.
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