Spark Plug

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  • January 3, 2021 at 8:32 pm #226976
    yooperrigged
    Participant

      US Member

      Hello,
      Will it be ok to use a J6C plug in a 1968 Johnson SC10S? I know it calls for a J4c. I am just checking. TIA
      Yooperrigged

      January 3, 2021 at 8:57 pm #226979
      Mumbles
      Participant

        The J4C is a bit colder than the J6C but if the motor is getting worn out a bit and getting low on compression after all these years, the hotter J6C should be OK. It’s best to remove the new plug after running it a for a while and read it to see if it’s burning OK.

        January 3, 2021 at 9:41 pm #226986
        yooperrigged
        Participant

          US Member

          Ok, thanks Mumbles. I have a J6C on hand currently, but I will order a J4C as well. I guess there is no rush since the ice is 10 inches thick. 😎

          January 6, 2021 at 2:36 pm #227133
          outbdnut2
          Participant

            US Member

            If you plan on slow trolling for hours at a time the J6C will probably stay cleaner.
            Dave

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