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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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