You need to adjust for a richer mixture, e.g. idle air closed some, main jet opened some. You need to be sure the lean mixture isn't from manifold gasket leaks or from leaks around the throttle shaft. You can use a propane torch around those potential trouble spots. No flame just spilling propane. If the engine runs smoother you have found a leak.
The book settings on the mixture adjustments are just close enough to right to let the engine run so you can tune them properly.
On a governed engine the governor will hide the effects of your adjustments unless you override the governor, or adjust for minimum throttle opening that the governor accomplishes as you improve the tuning. The main jet may need to be a little richer than maximum engine speed lightly load when you load it to get maximum power.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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