1960 40 HP – Bottom cylinder misfire

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  • October 29, 2026 at 6:37 pm #330708
    Don
    Participant

      US Member
      TJ Brandon wrote:

      I just got a NOS breaker point and so far the barrel test in the driveway looks like it is promising. I can’t get to the lake until Saturday morning though. I really don’t know why this set of points would have worked.

      Well, at this point, don’t argue with success!  Hope it works out on the water….

      October 31, 2026 at 2:45 pm #330766
      TJ Brandon
      Participant

        US Member

        The lake test was a bust. Initially it ran great, then the misfire started then went away, then started again. Really inconsistent. I am almost out of time for the year in Michigan…

        October 31, 2026 at 3:54 pm #330767
        JOSEPH BRINCAT
        Participant

          US MEMBER PAY BY CHECK

          Frustrating for sure !  I wish that I could help, where are you in MI? are an AOMCI member ? We have been blessed with remarkable weather here in MI , but it won’t last much longer I fear. Your issue sure sounds like the problem that I referenced in my previous post about the 9.5 hp.

          Joe B

          November 1, 2026 at 10:45 am #330850
          TJ Brandon
          Participant

            US Member

            I’m in Oakland county but keep the boat in the water in northern michigsn in the summer. I think at this point i am going to swap powerheads from a 58 evinrude 35 and see how that goes

            November 1, 2026 at 11:14 am #330851
            JACQUES
            Participant

              never give up    Never-give-up

              oops sorry !  can’t delete  the file for this  one

              Joining AOMCI has priviledges 🙂

              November 2, 2026 at 8:13 am #330890
              Don
              Participant

                US Member

                Well, I wouldn’t go that far.   But, you need to abolutely make sure that it is an ignition issue that is causing the cylinder to misfire/drop out.  Are you sure there is no internal water leak causing this problem?   It is time to start over again with the ignition, I fear we have missed something…

                That being said, you could simply swap the mag plate assemblies with the 58 engine, perhaps that might point something out…..

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