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Plug color?

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Can you go by the color of the plug on a 4 stroke to determine if it's rich or lean? I took my plug out of my CRF250R and it is pretty white, if it was a 2 stroke I'd say it was pretty lean but someone said you cant go by that with a 4 stroke.

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The CRF idle is relatively lean with a #40 PJ on the '04 models, but not above that. Unleaded fuels make plug checks difficult to interpret, try to judge by how it feels and if the bike seems to be running too hot.

James

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