There was a post or a webpage that someone posted several months ago which described what the condition of the spark plug means.  IE, if its black you are running rich, white, lean.. etc.. (I don't remember what it was).. Anyone have that post or can post a summary of what a plug should look like?

See if this helps.  It may not be the same info that was posted before, but it's good stuff!

http://www.dansmc.com/sparkplugs1.htm

Don't miss the Click Here link in the second paragraph.

relevant thread resurrection