I have a Kohler 18 hp, twin-cylinder engine on a Craftsman 44" mower. It
started running rough yesterday--little power, very rough idle, black puffs
of smoke out the muffler. Any ideas what's wrong and how to fix it?
Too much gas causes the black smoke. It could be the float valves (if
your model has them) are stuck open. In the old days we fixed that
with a sharp wrap up the side of the carb with a rubber mallet. Less
aggressive folk rebuild the carb using a kit from a repair shop.
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