1931 EVINRUDE 401 QUESTIONS

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  • May 9, 2018 at 2:15 am #75602
    garry-in-michigan
    Participant

      Lifetime Member

      The coil ground is for the primary coil to the breaker points. The secondary (High Voltage) coil is grounded through the spark plugs being screwed into the cylinders. If one side is missing it is because the spark has found a lower resistance to ground (Engine block) than through the spark plug. Look for a crack in the plug wire insolation, usually where it is clamped to the magneto plate. . . 😉

      May 10, 2018 at 7:43 pm #75708
      keplerfan
      Participant

        US Member - 2 Years

        It looks like I have weak spark. The points light up like the fourth of july but the spark on the plugs is weak and blue. I filed the points really good and reset them several times at different gaps. I cleaned all grounds. The coil tests hot with a 10k scale multimeter from spark wire to spark wire. Kind of at a loss here. Any thoughts?

        May 10, 2018 at 11:06 pm #75727
        The Boat House
        Participant

          quote keplerfan:

          The points light up like the fourth of July but the spark on the plugs is weak


          Condenser?

          May 12, 2018 at 11:04 pm #75859
          keplerfan
          Participant

            US Member - 2 Years

            Thanks, Tubs. The problem did turned out to be the condenser. I put in a condenser from a 1933 Neptune ob4 and it works fine. I think I am going to have to find one that fits better. Am I looking for one that has particular specs or just one that works?

            Thanks to all. Here is a video of it running:
            https://www.youtube.com/watch?v=_ufUuvbFgUk

            May 13, 2018 at 1:04 am #75864
            Buccaneer
            Participant

              US Member

              Looks like your hand comes awful close to that spark
              plug when you advance the magneto…. nothing like
              30,000 volts to wake you up in the morning! 😯

              Prepare to be boarded!

              May 13, 2018 at 3:05 am #75878
              keplerfan
              Participant

                US Member - 2 Years

                Lol
                it got me right at the end of the video.
                the motor almost dies and I throttle up fast. watch my thumb hit the plug and then I pull away 😀

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