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what causes a spark plug to foul out?

My craftsman push mower is not running smooth. I cleaned the filter and checked the plug. The plug is all sooty what causes that?
Cherie, September 2008
What engne type? Briggs carb-on-tank? Change diaphragm.

If not, the symptoms are of a rich mixture. You checked the air filter - does it leak fuel? If so, and you have a float type carb - you may need to clean the inlet needle valve (inside float bowl).

phil_saunders@bigfoot.com

Phil Saunders, September 2008
Sounds like a 2 stoke engine and you adding too much oil to the petrol...

Could be a few other things but check your oil to petrol ratio

Stonesy, September 2008
link Click here to see other fixes for Craftsman.