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We have an Indy 500 that has a shaved head on it. When a friend finished rebuiliding it, it wouldn't run right for him with the stock plugs in it. He replaced the RN3C's with BR9ES. It ran okay for a few hours that way, then it began to foul out plugs every couple minutes at all rpm's within the powerband. The plugs on both cylinders seemed very black. We just changed the plugs back to the stock plugs (RN3C) and now it really runs good and the insulator is a light brown as can be seen below. Do you think this color looks good, or too hot. I don't have much experience with measuring the color of spark plugs. Thanks.[attachment=50705]
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