If it's all the way in, back it out about 3.5 turns and go from there. If it's out all the way out, screw it in till it stops (don't torque it down) then back it out 3.5 turns and go from there. The motor should have a nice transition from idle to speed, then at wide open throttle should smoke nicely without bogging. If it's too lean it will spudder and sound as if it's "missing out".