What is the purpose of the idle mixture screw on a four-stroke engine with a carburettor? How is it adjusted? - Quora

Answer: Normally there are 2 idle adjustment screw on a carb. One for idle mixture and other for idle speed (RPM). Play with them to synch. But mixture should give you most smooth and highest RPM to decide OK. Then adjust the speed screw. Then test again for mixture if still OK. If carb. is Walbr

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The BEST Way To Fine Tune Idle Mixture Screws For Your Carburetor