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I use NGK plugs, go by how much plating is scorched on the plug plus exhuast temp readings. I was told you like to see about 2/3 of the plating scorched at the base of the plug, or the surface that is even with the chamber wall.


I found that after only one run on a plug, if the plating has burnt off just down off the ground strap onto the top ring of the plug you are close. It is very hard to tell. They will tan up after a few runs if you are close. You can tell if it is rich because the plug looks washed but lean is another story even with egt gauge. I had good temp reading and leaned out. Took the porcelian right off the electrode.