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how can i stop my toro walk behind mower from blowing out black smoke ?

I've changed the oil and filter. My mower is a 15 hp Kawaski 44" walk behind. It is putting out noticeably black smoke and not idling right. what can I do ?
Tiffany, March 2010
Black smoke would suggest it is running too rich, clean/change the air filter, could be carb needle leaking and flooding.

Husqvarna man, March 2010
change the piston rings

jason, March 2010
link Click here to see other fixes for Toro.