Turning the mixture screw CCW leans so the screw missing completely should create a VERY lean condition....but would run like it had a large vacuum leak.
Morley can fix you up with a new one.
i thought it was a fuel passageway so turning it 'out' made it richer? also why if you're more than 4-5 turns out they recommend a larger pilot jet?
although from this pic it seems like it controls a 'mixture' not just fuel or air.
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