Has the governor been adjusted according to the procedure listed in the Kohler manual? If so and it still hunts, it's a mixture issue. If you haven't followed the service manual to adjust the gov, do that first. The only way it could hunt from mixture is if the high speed were nearly closed and extremely lean. Also, have you got a constant flow of clean fuel to the carb?
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149, 2072, Original, 1772, 1782, #1 cart, Parker 48" sweeper,
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