Set #3 at 3 full turns out and leave it there. You ABSOLUTELY will not notice any difference in how the tractor runs UNLESS the engine is wide open under FULL load. If the engine sputters and stumbles under full load, then open the #3 screw in 1/2 turn increments until it smooths out. If the tractor is doing ONLY light work, such as tractor rides or parade duty, then the #3 screw can probably be turned IN to 1 1/2 to 2 turns out for better fuel efficiency.
Try to understand the "load adjustment" screw. It provides a way to adjust the amount of fuel the engine receives in order to realize the greatest fuel effiency under varying WORK LOADS.
The factory initial setting IS 3 turns out.
For what it's worth, that carburetor in the picture is for an M. It is NOT a Super M carburetor, but will work equally well. A Super M carburetor will have the choke lever on the INSIDE.
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