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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.

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NGK Have to be read after one run with the engine shutoff before the turn off. Have to use new plugs every run to be able to read them.I've read hundreds. I wanted to see 2 threads discolored.

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I guess you are building a bit more heat!