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Message: <blockquote data-quote="Pappy" data-source="post: 469430" data-attributes="member: 3278">Your idle needle controls the fuel/air emulsion. You are correct in how it works. In will close of the emulsion and lean the engine and out will richen it. When in the water and doing your final adjustments you will want to lean the needle to the point the engine spits lean and then back the needle out 1/8-1/4 turn for best idle. Make your adjustments slowly and listen to the engine. As you are finding out, it will tell you what it wants. High speed needle should start a bit on the rich side and then at WOT you lean it to the highest RPM and keep going until you hear the engine slow a bit. Bring the needle back out to the highest RPM and richen another 1/8 turn or so. There should be an idle throttle stop that is adjustable on that engine down at the gear on the port side under the pan. You can use it to set minimum idle RPM</blockquote>