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Discussion Starter · #1 ·
I've read several good posts about reading plugs lately. Thanks Monte and Mike. The pics make all the difference in putting the info to practical use. I still have a few questions though. How does the heat range of the spark plug affect the tune-up? If the plug is too hot or cold how does it affect the look of the plug? Does anyone have pics of a plug that has the wrong heat range vs. the correct heat range with same tune-up?
 
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