1937 Johnson 210, 3.3 hp, runs “Doggy”

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  • May 14, 2022 at 6:33 pm #259859
    Buccaneer
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      US Member

      First time I had this one in the barrel today after going through the motor this
      last winter. It idles better than it runs fast. When you try going fast it
      sounds real “doggy”….. like a slow dog on a hot day.
      The carb was tuned-in to it’s sweet spot, and there’s not much leeway either
      way on the needle adjustment.
      The cylinders are running nice and cool, so it’s not over heating.
      Both plugs were hot to the touch.
      The longer I ran it, the worse it got going “fast”, and eventually quit on me.
      Being that it idles better than it goes fast, I’m thinking maybe the coil is B.O.
      I only tested it with an ohm meter and it seemed okay.
      Any other ideas on what’s wrong?
      I’ll have to see if I can find one running on YouTube for comparison.
      https://youtu.be/EyuYx2Goruw

      Prepare to be boarded!

      May 14, 2022 at 7:06 pm #259861
      dave-bernard
      Participant

        US Member

        partly blocked exhaust???????????

        May 14, 2022 at 9:26 pm #259868
        Buccaneer
        Participant

          US Member

          Exhaust was sandblasted inside and out. It’s just a big can with two inlets,
          one outlet, all wide open.

          Prepare to be boarded!

          May 14, 2022 at 9:39 pm #259869
          Buccaneer
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            US Member

            I just listened to several Johson 210’s run on YouTube.
            Some of them sounded a little “doggy” as well, but seem to
            wind up a little more.
            This one sounded the best……..
            https://youtu.be/zuhrqldL1hA

            Prepare to be boarded!

            May 14, 2022 at 10:15 pm #259870
            HARRY D. NICHOLSON
            Participant

              US MEMBER PAY BY CHECK

              Some motors can’t stand running in smoky air thats’ already been through combustion.  Set up a window fan blowing onto the front to keep smoke away from the carb.

              May 14, 2022 at 11:09 pm #259871
              Buccaneer
              Participant

                US Member

                Harry, I’ll try the fan tomorrow after I get the gas leaks fixed. Thanks.
                I put 11:1 fuel mixture in the motor……. not sure what it’s suppose to be.
                Also, I should verify what spark plugs it takes.

                Prepare to be boarded!

                May 15, 2022 at 8:37 am #259875
                Tubs
                Participant



                  Too much prop maybe?
                  Tubs                  .

                  A "Boathouse Repair" is one that done without having tools or the skills to do it properly.

                  May 15, 2022 at 9:05 am #259879
                  Buccaneer
                  Participant

                    US Member
                    Tubs wrote:



                    Too much prop maybe?
                    Tubs                    .

                    I believe it has a three blade prop on it. I have not compared it to other 210 photos,
                    but that’s good food for thought. The reason I was thinking coil is because the
                    longer I ran it, the worse it ran at high speed, and eventually quit. Not sure if I
                    tried restarting it after that point, as I need to address the gas line leaks.
                    Thanks.

                    Prepare to be boarded!

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