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I had a serious rich-running problem I couldn't figure out, and used plugs that were one heat range hotter than usual as a stopgap measure until I could get the carbs sorted out. Turns out I needed to adjust the float levels, so now I'm back to the regular plugs. I've also used plugs that were one heat range colder than stock when I was doing some top speed testing and a lot of high rpm running many years ago.
 
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