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4 to 5 year old Craftsman mower with a 13.5 hp B&S starts good, runs good. Until I engage the blade, then it runs rough and blows black smoke. If I return the throttle to an idle it will smooth out. I can slowly move the throttle to about halfway before it goes to running rough again. Rebuilt carb, set valves and governor.

Post up your engine #'s and Craftsman model #.

Thanks for the reply. Fixed it yesterday. Even though the carb looked good, I replaced it and the problem went away.

Sounds good, glad you got it fixed.