Thoughts on Johnson A-50

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  • April 12, 2020 at 11:20 am #199760
    David Bartlett
    Participant

      US Member - 2 Years

      I am looking at a Johnson A-50 near me. Motor appears complete in pics provided by seller. Anybody out there have anything to say about these? Serial # 151377

      Thanks.

      David Bartlett
      Pine Tree Boating Club Chapter

      "I don't fully understand everything I know!"

      April 12, 2020 at 12:19 pm #199770
      squierka39
      Participant

        US Member

        Dave, they are just a scaled down K-50. Very similar to your KA37 but, old style lower unit and carb. Nice little motors.

        April 12, 2020 at 1:07 pm #199774
        David Bartlett
        Participant

          US Member - 2 Years

          Mike,

          Thanks. I noticed the older style carb and lower unit. I will probably go look at it. Pictures show a dirty, dusty motor, but as I said it looks complete. One dent in the tank. Decals are either gone or covered in dirt.

          Gotta have something to do besides eating and sleeping. 😷

          David Bartlett
          Pine Tree Boating Club Chapter

          "I don't fully understand everything I know!"

          April 12, 2020 at 5:36 pm #199780
          opposedtwin
          Participant

            US Member - 2 Years

            First year of alternate firing design for the SA model. Decent little runners.

            April 12, 2020 at 6:25 pm #199784
            10717
            Participant

              I have an A70 that I use regularly on a 12’ Thompson cartopper. It is a smooth easy to run little motor.

              April 12, 2020 at 10:08 pm #199869
              need2fish
              Participant

                I have 2 A-70s. One to run and a pretty one to hang on the wall to get oohs-and aahs. a little bit of Mothers Metal Polish cleans them up really nice.

                Bullet proof magneto, not so fun to start when the temp approaches freezing (fuel doesn’t want to atomize).

                I have Ks and Js of the same era and I notice in my (cold) lake they carbon up in the exhaust outlet on the bottom of the powerhead — it effectively prevents scavenging of exhaust gases. Maybe that’s a place to inspect before you spend hours of pulling to produce a few pops.

                April 13, 2020 at 7:12 am #199879
                stanley
                Participant

                  US Member - 2 Years

                  The crank case bushings and rotary valve clearance are the Achilles heel of these engines.Check for excessive play by trying to move flywheel side to side.

                  April 13, 2020 at 10:05 am #199889
                  David Bartlett
                  Participant

                    US Member - 2 Years

                    Thanks for the input. I picked it up this morning on my way to work.

                    I will post some pics when I get a chance.

                    David Bartlett
                    Pine Tree Boating Club Chapter

                    "I don't fully understand everything I know!"

                    April 13, 2020 at 10:46 am #199895
                    squierka39
                    Participant

                      US Member

                      Cool, I look forward to seeing it in projects.

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