Resistor Spark Plugs?

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  • March 10, 2015 at 9:21 pm #891
    Buccaneer
    Participant

      US Member

      In looking to order spark plugs for my 1936 Muncie Neptune OB34A, 4 hp twin,
      I found a chart that suggested using Auto-lite 386 (18mm plugs).
      They are listed as "Resistor" type spark plugs.
      What’s your thoughts as far as using resistor type spark plugs in a magneto
      system?
      Thanks, TG

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      March 10, 2015 at 10:45 pm #11759
      frankr
      Participant

        US Member

        That’s the trouble with spark plug charts. They’ll tell you to use anything that fits the hole. As a general rule, resistor plugs are to be avoided in outboards, with a few exceptions. And I don’t think that Muncie would be one of them.

        March 11, 2015 at 1:07 am #11766
        RICHARD A. WHITE
        Participant

          Lifetime Member

          I have an OB34A in the shop I am going to restore, ,it has Champion UD-14 plugs in it. My Champion Spark plug chart shows usage of the 6M plug

          http://www.richardsoutboardtools.com
          classicomctools@gmail.com

          March 11, 2015 at 2:00 am #11770
          Buccaneer
          Participant

            US Member

            Thanks for the input guys. I’ll check out the champion 6M

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            March 11, 2015 at 2:29 am #11773
            Mumbles
            Participant

              Save the resistor plugs for the modern CD ignition systems.

              March 11, 2015 at 3:57 am #11785
              jcrigan
              Participant

                I Have Champion #516 or D-16 in mine. Set at 0.025". I was recommended those Autolight 386’s some time back and bought a dozen of them. They don’t work on any of our old motors.

                March 11, 2015 at 1:39 pm #11808
                Buccaneer
                Participant

                  US Member

                  Glad I asked! Thanks, TG

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                  March 11, 2015 at 1:46 pm #11810
                  Anonymous

                    The Champion spark plug list shows the 6M plug. The modern plug number for the 6M is a D14 #514 gaped at .025 , the D16 #516 is a hotter heat range, possibly too hot and may cause problems if used.

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