Originally Posted by danthurs

I just looked at the link, and what it shows does look very much like what you have. Here are the examples I go by. http://www.verrill.com/moto/sellingg...colorchart.htm And here normal is clean. I guess it comes down to personal preference. I learned that plugs are clean, if not you find out why. Plugs can tell you just about everything about your engine, if you just know what to look at. I really like your observation about the electron flow and wear on the electrodes. And as I said, it's not something I would be worried about. But if I were to say pull my valve covers for some reason, I would change out valve seals. But that's just me.