Spark plug

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  • June 1, 2021 at 2:20 pm #239334
    james hobson
    Participant

      My 57 7.5 uses a J6J spark plug I want to run a hotter plug what spark plug can I run one or two steps hotter also any harm in doing so.

      June 1, 2021 at 6:51 pm #239359
      Mumbles
      Participant

        NGK B6S is equivalent to the old J6J which has been replaced by the J6C. I don’t think NGK makes anything hotter in that style and if they did, it would be a B4S. Champion J8C would be the next hotter plug up from the J6C.

        If your motor needs hotter plugs, you should try and find out why. If it is trolled a lot or the carb is adjusted too rich, then a hotter plug will be required. Running way too hot of a plug can cause pistons to melt but you should be OK with the J8C’s.

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