1969 Johnson 25R69D 25hp Outboard Motor

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  • March 27, 2023 at 9:20 am #274421
    Evinrude 25
    Participant

      I picked up this Johnson 25R69D a two month ago no spark so I put a new OMC tune up kit and got spark. Compression is  118-120 psi on both cylinders so it is a good new.

      I gave a good carb clean up with Ultra sonic cleaner and let it for until yesterday (nice weather). I started it in the barrel, it ran nice but it die for a minute and I could start it back again no problem (One or two pulls). I think the fuel delivery it not enough to keep it running  (1.5 turn of the idle needle to 1.75 turn). By looking at the fuel pump, I think this fuel pump does not deliver enough fuel to the Carb ???

       

      March 27, 2023 at 9:58 am #274425
      crosbyman
      Participant

        Canada Member - 2 Years

        fuel pump is big enough .. in any event the engine should run at idle with no problem  if the carb low speed circuit  is ok

        try to pump the fuel bulb and if    the engine now runs ok then the fuel  pump is simply faulty  or not installed properly

        if the engine does not run  better with  hand pumping the fuel into the carb……  then there is another issue to resolve.   Check for sparks when it dies…   you replaced the electricals ….but

        clean..clean clean  the points..    even new condensers may be faulty      new plug cabling and boots  ?

        tank vent is open  and  working ??   new hose .. old hose ??     side connector sucking air ???

         

        Engine  PH looks super clean  must  have had lots of TLC… or a recent wash 🙂   nice kill button !

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        March 27, 2023 at 10:22 am #274433
        fleetwin
        Participant

          US Member - 2 Years

          Someone has replaced the original stop switch with that hokey set up, might be a problem.  The original wiring had connector plugs that would allow you to disconnect the stop switch from outside the mag plate.  If so, I would try running the engine with that stop switch unplugged.  Unfortunately, it looks as if whoever was messing with this engine removed the plugs as well.

          You mention the engine starts right back up again when it stalls.  Will it start without pumping up the fuel bulb again?  If so, the fuel pump is probably not the issue.  Does the engine sneeze/cough when it stalls, or just shut off?

          March 27, 2023 at 10:49 am #274435
          crosbyman
          Participant

            Canada Member - 2 Years

            the stop switch installed is a normally open switch . I ordered some years ago.   well made   solid .     If anything the old style  with connectors had very britlle wires

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            March 27, 2023 at 2:41 pm #274439
            Evinrude 25
            Participant

              Owning a couple outboards (10 plus), I am thinking about the metal stand instead of wooden stand. I draw and make one and test it out for this Johnson first.

              March 27, 2023 at 4:31 pm #274444
              fleetwin
              Participant

                US Member - 2 Years
                crosbyman wrote:

                the stop switch installed is a normally open switch . I ordered some years ago.   well made   solid .     If anything the old style  with connectors had very britlle wires

                Well, it would have been nice if the quick connectors were retained for simple troubleshooting.

                March 27, 2023 at 5:03 pm #274446
                crosbyman
                Participant

                  Canada Member - 2 Years

                  agree… any  2 wire  battery plug would do fine.

                  zdyCGTime SAE Extension Cord，Battery Cable SAE to SAE Extension Cable Quick Disconnect Wire Harness SAE Power Automotive Cable with Waterproof Cap,for Automotive, Solar Panel Panel 10AWG 1m/3ft : Amazon.ca: Automotive

                   

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                  March 27, 2023 at 5:05 pm #274447
                  crosbyman
                  Participant

                    Canada Member - 2 Years

                    agree… any  2 wire  battery plug  like this one in a smaller gauge   would do fine.

                    zdyCGTime SAE Extension Cord，Battery Cable SAE to SAE Extension Cable Quick Disconnect Wire Harness SAE Power Automotive Cable with Waterproof Cap,for Automotive, Solar Panel Panel 10AWG 1m/3ft : Amazon.ca: Automotive

                     

                    Joining AOMCI has priviledges 🙂

                    March 28, 2023 at 11:40 am #274494
                    Mumbles
                    Participant

                      To check the fuel pump operation, you can place the tank on top of a stepladder or something higher than the pump itself.  This way, fuel will syphon into the pump instead of being sucked into it.  These pumps can only lift fuel 30″ or so, anymore than that and the motor will starve.

                      Does the motor sneeze when it dies? If so, the top seal on the crank is probably worn and leaking.  Does the bulb in the fuel line need squeezing again to prime the carb?

                      It was around ’69 OMC started thinking green and began doing something about the unburned oil going thru the motor.  Where does the drain line from the front of the manifold go?  It should terminate either on a nipple on one of the bipass covers or one of the bolts holding them on.

                      Also, is this a budget aftermarket fuel pump?  If so, all the screws holding it together  will need tightening to prevent any vacumm/fuel leaks.

                      The idle quality of motors from this area has always been questionable because of the green improvements. Opening the mixture needle slightly may help a bit, especially if there are any air leaks into it. Even though they don’t idle like a Cadillac, it should run like a scalded dog at WOT.

                      Here’s how I check for a leaking top seal.

                      https://youtube.com/shorts/cXt6fV6Z5rc?feature=share

                      69-25-Johnson

                      March 29, 2023 at 9:55 am #274548
                      Evinrude 25
                      Participant

                        Hello Mumbles.

                        I put the fuel tank higher to verify your suggestion

                        The top seal on the crank is probably worn and leaking (I have replaced the top crank seal at the same time I installed the new OMC tune up kit (points, condensers)

                        Where does the drain line from the front of the manifold go?  It goes to the terminate on a nipple on one of the lower cover below the fuel pump (you may see it in the video)

                        Also, is this a budget aftermarket fuel pump? I am not sure if it is Chinese version since it was there already. I have checked the tightening and it was good so far. I have a spare pump which I may swap it out this weekend.

                        Opening the mixture needle slightly may help a bit, I have opened it additional 1/4 turn. Look like almost 2 turns now.

                        Please check the video link

                        https://youtube.com/shorts/OLI0svVpr_c?feature=share

                        https://youtube.com/shorts/RY-dCiivc4U?feature=share

                         

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