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 - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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