well on an lt185 the only screw type mixture adjustment on the carb should be the pilot air bleed (affects idle + under 1/4 throttle). the normal procedure is reversed with this screw, since it adjusts air, not fuel (going in goes richer, out goes leaner). otherwise your other adjustments are the needle clip position (midrange + throttle response), and the main jet (top end).
this might be useful for ya:
people.morrisville.edu/~crovelp/Carburetor%20Theory.ppt
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