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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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