Spark Plug Heat Range
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Thread: Spark Plug Heat Range

  1. #1
    Cal
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    Junior Member Cal's Avatar
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    Spark Plug Heat Range

    Have you guys ever used a spark plug that is hotter or colder than the original? What were the results?
    1979 Honda Hawk CB400 T1

  2. #2
    Super Moderator J-T's Avatar
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    Some have tried with varying results. IMHO changing plugs is mostly a way of avoiding the effort involved in fixing whatever the real problem is.
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    JT
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    Senior Member ancientdad's Avatar
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    ^^^like running a bit rich or a bit lean
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    Tom

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    Senior Member 83XLX's Avatar
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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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    1983 H-D XLX-61 Sportster

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