Before you play too much try and bring the idle down nice and low with the idle screw, and then adjust the air screw. I'd suggest 1.5 turns from fully seated, but you may come out further. If it idles up when you open the air screw you can bring the idle back down again with the idle screw. When its on the money it'll tick over like a sewing machine, and the air screw will be quite effective where opening it up causes a lean condition and going rich makes it want to flame out a bit.
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