Light four imperial

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  • March 3, 2020 at 9:12 pm #196580
    Mike M
    Participant

      Can anyone tell me what kind of spark plug to use in a evinrude light four imperial model # 4178
      Thank you

      March 3, 2020 at 10:25 pm #196583
      Buccaneer
      Participant

        US Member

        The old charts called for a Champion M5. Do some searches
        and see what a modern equivalent may be.

        Prepare to be boarded!

        March 4, 2020 at 11:09 am #196633
        Mike M
        Participant

          Thanks for your help.. Having trouble finding a plug .. the closet I can find is a champion RD16 for a1942 light four 9.7
          Do you think that would work?

          March 4, 2020 at 4:56 pm #196654
          Buccaneer
          Participant

            US Member

            Are your plugs holes 18 mm?
            According to this chart, a 5M Champion, which I assume
            is the same as a M5, is 18 mm, and is on the cold end
            of the heat range.

            Champion-Spark-Plug-Charts

            Prepare to be boarded!

            March 4, 2020 at 5:05 pm #196658
            Buccaneer
            Participant

              US Member

              I see RD16 is 18 mm, but a resister type plug, which I’m told to avoid in magneto
              type outboards.
              This chart say you need a Champion 509 or D9…..

              Champion-Spark-Plug-Replacement-Chart

              Prepare to be boarded!

              March 4, 2020 at 5:09 pm #196661
              Mike M
              Participant

                Thanks for all your help I think I’ll go with the D9

                March 4, 2020 at 5:09 pm #196662
                Buccaneer
                Participant

                  US Member

                  The 509’s appear to be readily available on EBay…….
                  https://www.ebay.com/itm/Spark-Plug-Copper-Plus-Champion-Spark-Plug-509/254443926839?epid=223400202&hash=item3b3e0a3537:g:t-UAAOSwr6deVjBy

                  Prepare to be boarded!

                  March 4, 2020 at 5:15 pm #196664
                  Mike M
                  Participant

                    Yes I’ll pick up the 509 they’re available at Napa auto.. Thanks for all your help on this man

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