1950 Speeditwin Carburetor Leaking Fuel

Home › Forum › Ask A Member › 1950 Speeditwin Carburetor Leaking Fuel

Viewing 10 posts - 11 through 20 (of 33 total)
1 2 3 4
  • Author
    Posts
  • February 29, 2016 at 6:21 pm #32682
    crosbyman
    Participant

      Canada Member

      http://boatinfo.no/lib/johnson/manuals/ … hnson.html

      this may provide lots of info around page 88

      Joining AOMCI has priviledges 🙂

      February 29, 2016 at 7:34 pm #32684
      david-bartlett
      Participant

        Viking66,

        If you go to page 2 of this forum, you can see my thread "Speeditwin,Speedifour owners manuals wanted". Garry Spencer sent me a parts and operating manual for them. It could be useful.

        David

        March 2, 2016 at 12:05 am #32754
        viking66
        Participant

          Thanks again. I did see the info put out on you thread. I actually saw that before I had mine running, very informative.

          Now I am still having issues that I hope someone who has a bit on knowledge on these engine can guide me in the right direction.

          My Speeditwin will not start with the hood on it. It wants to and it will sputter and try, but it will not go.

          When I remove the hood it will start, and then I can see the gas really coming out of the throat. I have a video I will see how to upload. Basically if I hold my hand in the front of the throat and count to 3, gas is running off of my off the palm of my hand…no BS. Any idea what could cause this much gas to be expelled from the throat while running? I have tried a bunch of different setting on both the High side jet, and low side jets. This gas still expels out big time.

          I am also not getting any water to pump. I may not have the LU in the bucket far enough. I have it to the top of the inlet holes like it shows in the book. Does that sound right?

          Thanks to all who help me with my outboard addiction 😆 😆

          March 3, 2016 at 11:49 am #32831
          viking66
          Participant

            Finally had time to get the video of my Carb situation posted.

            Please advise if you have any ideas.

            Thanks as always!!!

            https://www.youtube.com/watch?v=j5BD5sndPfo

            March 3, 2016 at 11:50 am #32832
            viking66
            Participant

              Notice at the end how much is running off of my hand…Arghhhh

              March 3, 2016 at 1:58 pm #32839
              Buccaneer
              Participant

                US Member

                It seems to idle pretty good with the extra fuel, but guess it’s because it’s
                expelling it. Is it a rotory valve or reed engine? Perhaps worn internals?
                Also, if it was mounted on a boat leaning "back" another 12 degrees,
                perhaps less gas would be blowing out.

                Prepare to be boarded!

                March 3, 2016 at 2:04 pm #32840
                george-emmanuel
                Participant

                  US Member

                  Somethings not right. The video doesn’t show the complete engine but I think I caught a glimpse of the mag handle and it looks quite advanced. For that engine to idle that slow the mag should be in a retarded position especially in light of the no-load in the barrel.

                  Maybe I’m wrong on this and someone else will chime in. I also want to check mine and see where the carb lever position is.

                  George

                  March 3, 2016 at 2:35 pm #32841
                  viking66
                  Participant

                    Thanks for the responses.

                    I set the mag handle to close to where it says start on the hood. I have the High speed wheel set to start as well, and the speed control handle. The Low Speed jet is 1.5 turns out as stated in the manual.

                    If I try to bring it to a lower idle it dies at this point.

                    Correct, no load in the barrel, I have the prop off so water doesn’t fly all ober the place.

                    March 4, 2016 at 8:11 am #32885
                    david-bartlett
                    Participant
                      quote George Emmanuel:

                      Somethings not right. The video doesn’t show the complete engine but I think I caught a glimpse of the mag handle and it looks quite advanced. For that engine to idle that slow the mag should be in a retarded position especially in light of the no-load in the barrel.

                      Maybe I’m wrong on this and someone else will chime in. I also want to check mine and see where the carb lever position is.

                      George

                      I agree! The throttle stop looks in the approximate correct position, but the throttle lever seems to be advanced too far for the speed the engine is running at. It should really be turning up at that position.

                      You mentioned the low speed needle was 1 & 1/2 turns out. What I read says it should be 1/2 turn out. It seems to be getting too much fuel from the low speed side of the carb when running, and not enough from the high speed side.

                      March 4, 2016 at 11:54 am #32887
                      viking66
                      Participant

                        I took the Carb off last night and stripped it down to Parade Rest. I blew out every passage, looked at both the low and high speed needles and jets, both looked good. I also checked the Primer valve, it seals shut solid so no fuel coming from there.

                        The only thing I noticed was the Low speed assembly had 2 gaskets on it and both were not in the best of shape. I replaced them with a new fiber gasket I had. Could this be it…maybe?

                        I did not have a chance to start it back up last night because it was to late. Today is my day off so I will start it again this morning for a test.

                        As far as the Low speed jet adjustment goes it states in the Operating and General Instruction manual on page 6 says that it is 1 1/2 turns. I then looked at the instructions decal on top of the tank and it to says 1 1/2 turns out and then to adjust after the motor is warm and under running conditions.

                        I made myself a real nice test tank from an abandoned bin I found so I can have the prop on and run this motor under semi normal conditions and see better exactly what is going on. Having this tank also confirmed that I did not have the LU down far enough in the water for it to pump correctly. It does pump water quite well so that can be checked off of the list as working now.

                        I hope to report later today that I don’t have a gallon of fuel a minute spurting out of the throat…lol

                        Thanks all for the support. I do know these old beasts can be very finicky when we want them to wake from their many years of slumber.

                      • Author
                        Posts
                      Viewing 10 posts - 11 through 20 (of 33 total)
                      1 2 3 4
                      • You must be logged in to reply to this topic.