George I would not mess with it too much. You have gotten 1500 hours out of it. That is pretty good for a Kohler Command engine. I buy several mowers each year that have "bad" Kohler Command motors. Most of them have around 500 hours. The most common issue is broken rings from over heating. This is usually from them running too lean.
I personally do not think much of Kohler motors anymore. I just have not gotten the life out of them that the Hondas and Kawasaki motors seem to give.
As for looking for a adjustable carb. all you really need to match is Horse power and displacement. So if yours is a CH20 that is rated at 20 HP at 3600 PRM you just need to find a carb from a motor with the same rating. The air flow and fuel requirements would be about the same. So you should be able to adjust yours to where you want it to run.
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Today's Featured Article - Threshin Demonstration - by Michael Delaney. Introduction I bring you greetings from Prince Edward Island, Canada. We are Canada�s smallest province but big on farming. Maybe you�ve heard of us. Potatoes are our biggest crop. However, there is lots of mixed farming here also. I have a small mixed farm with 25-30 cattle. I make very good use of old machinery. I have a 135 MF Diesel, Farmall H and 1/3 share in an Allis B. I have complete lines of tillage and harvest equipment, and a saw gear etc. I have everything one would
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