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No mods, new stainless stock-type exhaust.
Fuel lines OK.
This morning I adjusted the main enrichment 6 clicks rich. It was really rich, smoke, and I could race the engine on butterflies alone, pump disconnected. So I reset it lean 3 clicks past where I started. Smoke cleared up, the engine did not race when I opened the throttles and idle went down to a relatively plesant 1400 rpm. I was pretty excited about that. I put the air cleaner on and went for a ride. The engine ran rough, misfired occasionally and I got small backfires from the fuel. So I reset it one click rich. The misfires went away, the engine ran very nicely on the road, but idle went to 1800. At least that is down 200. For the first time I feel like I have some control over what is going on. I redid the exercise with the main screw two more times going one click back and forth. I could predict the onset of rough running and the idle speed. It appears that the main screw is in control. I went to the idle screw, made a dramatic change and it didnt make any difference with the fully warmed up engine.
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