My lawn tractor with a Kawasaki engine had the same problem. I found that the linkage for the gas throttle had a lot of dirt on it and would not let the throttle close completely. So when I shut off the warm engine, gas leaked into the cylinder. It would take a lot of cranking to start. When it did start, the exhaust put out black smoke.
Testimonial: "its easy to start but wont idle right till you drive it then idles fine and everything till you shut it off."
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