With the engine warmed up, idle it down to 450-500 RPM. Back the screw out some then turn it in to best idle. Turning it in richens the mix, it adjusts air bleed not fuel.
If the adjustment has no effect, the idle circuit may be clogged. There is an idle jet, and 2 tiny holes in the throttle bore, right where the throttle plate closes against the bore. Important those holes are clear.
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Today's Featured Article - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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