no expert but i think the top one where tube/shaft from governor attaches is idle stop screw, controls idle engine speed by limiting how far throttle valve closes in carb. screw it in for faster idle speed out for slower. one at bottom of carb probably faces up is load adjustment at full throttle or under load , screw out for more fuel in for leaner mixture. other one, probably located just above carb bowl is idle air adjustment, controls fuel mixture at idle speed, out is more air-leaner mixture in more fuel. suggest checking owners manual or getting one
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