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  • Suzuki DT 85 1989 CLK

    Hello,
    First of all thanks to any collaboration.
    I have a 1989 suzuki dt 85 CLK. Rebuild carb, new sparkplugs, revised enter gasoline, new filters
    Between 75%-100% of power it makes a sound of intermitance.
    Any ideas of whats happening, could be the level of gas inside the carburator that is quite low?A problem with the revolution counter in carb nš2?
    Video attached https://youtu.be/ejPiDaz3JbA
    Last edited by PonsBor; 09-09-2021, 09:11 AM.

  • #2
    It doesn't sound like it's running on all cylinders? It could be fuel related, or electrical? The video is not very good for diagnosis.

    Good luck, post back on what you find out.

    Comment


    • #3
      Thanks for the answer. I am going to put another video. The problem its at maximum speed.
      I have check the sparkplugs and they are working. May be is with the level of gas inside the carburator. I am putting the float almost in paralel with the carb.
      I am wondering is not a electrical problem.

      Comment


      • #4
        Originally posted by Solarman View Post
        It doesn't sound like it's running on all cylinders? It could be fuel related, or electrical? The video is not very good for diagnosis.

        Good luck, post back on what you find out.
        https://youtu.be/ejPiDaz3JbA

        Comment


        • #5
          Ponsbor, it is extremely difficult to listen to a video and try to diagnose a problem?
          It would be better to describe what happened, that started this problem. Then explain all you have done to correct your problem.

          Good luck, post back and share what information you have.

          Comment


          • #6
            Thank You Solarman,

            I know its difficult to now whats happening only with the video and the sound.
            was loosing fuel in the three carburator at the surplus. Sometimes in the one at the bottom, sometimes the one in the middle, and sometimes the one on the top, so i see it was necessary to change needle.

            So i am nputting out the three carburator and rebuid. The carburator on the top was very clean in comparation with the others two. I have change the locks for the fuel on the bottom of the carburettors and the boards. I am putting the float almost in paralel to the carbs. Seeing the level putting the carburator in the other way around and blowing to see where is closing the carb.
            May be there is the posibility i am putting quite low the float so its not getting enough fuel. If i am increasing the level then the dock of the float (needle valvue assembly) will touch with the top of the carburattors.

            I wasnt sure that the three cilinders are working so i have check there is spark in each one. Didnt do a compress proof with the machine, but seems to be compression closing with one finger.
            There is no any alarms sounding or with the light. I am putting new impeler.
            Also i am changing the fuel filter inside the motor and the one that is outside for the water. The conection with the rubber tube are checked.
            I have checked all three carburators are working at the same time, they are oppening together and closing together.

            In the picture attached, (throttle rod adjustment there is a little gap between "c" and the "6" and may be this is the reason for not working at full throttle.
            I didnt rebuild fuelpump at any time since the last ten years, and didnt check the revolution counter attached at the middle carburator.

            I dont know what else could be.
            Thanks a lot,
            Dont worry in ask something else
            Attached Files

            Comment


            • #7
              Originally posted by Solarman View Post
              Ponsbor, it is extremely difficult to listen to a video and try to diagnose a problem?
              It would be better to describe what happened, that started this problem. Then explain all you have done to correct your problem.

              Good luck, post back and share what information you have.
              Thank You Solarman,

              I know its difficult to now whats happening only with the video and the sound.
              was loosing fuel in the three carburator at the surplus. Sometimes in the one at the bottom, sometimes the one in the middle, and sometimes the one on the top, so i see it was necessary to change needle.

              So i am nputting out the three carburator and rebuid. The carburator on the top was very clean in comparation with the others two. I have change the locks for the fuel on the bottom of the carburettors and the boards. I am putting the float almost in paralel to the carbs. Seeing the level putting the carburator in the other way around and blowing to see where is closing the carb.
              May be there is the posibility i am putting quite low the float so its not getting enough fuel. If i am increasing the level then the dock of the float (needle valvue assembly) will touch with the top of the carburattors.

              I wasnt sure that the three cilinders are working so i have check there is spark in each one. Didnt do a compress proof with the machine, but seems to be compression closing with one finger.
              There is no any alarms sounding or with the light. I am putting new impeler.
              Also i am changing the fuel filter inside the motor and the one that is outside for the water. The conection with the rubber tube are checked.
              I have checked all three carburators are working at the same time, they are oppening together and closing together.

              In the picture attached, (throttle rod adjustment there is a little gap between "c" and the "6" and may be this is the reason for not working at full throttle.
              I didnt rebuild fuelpump at any time since the last ten years, and didnt check the revolution counter attached at the middle carburator.

              I dont know what else could be.
              Thanks a lot,
              Dont worry in ask something else
              Attached Files

              Comment


              • #8
                Ponsbor, the rev "gear counting coil" should be next to flywheel to count teeth, must be proper distance by Suzuki manual. The TPS (throttle positon sensor) is usually mounted on the middle carb, connected to the throttle linkage.

                Do not change linkages unless you know they are messed up? If they are still set from factory don't change them.

                This is an old motor, and compression by "finger over plug hole" is NOT a proper test.

                Good luck, post back on what you find out.

                Comment


                • #9
                  Hello Solarman,

                  I am quite sure that is going to be a bad level in the cube of carburator bowl. By the way is no more loosing fuel by the surplus, this is a good news. I am putting again carburators outside and trying to increase the level of fuel a little, and tell if this was the problem

                  The linkages are still set from factory, i will not change them. Like almost all the motor. I am quite satisfied with this 32 years old motor.

                  I am trying a good test compression with the manometer and telling the results.

                  Thanks a lot

                  Comment


                  • #10
                    Hello,
                    Nice to meet you all, in special to Solarman.
                    I have a one question, In the picture attached, the bar with the number "1", it suposed to open the carburators, and in the manual says should be 14,5cm and after adjust. This circuit is working in middle revolution, at 25% open gas, so i think the effort should be direct, i mean, i could play with the distance, so carburators are opening earlier or later, it depends of the distance. If i am putting the bar number "1" short, it will open carburators early, and if i am putting quite long, it will a little more time to open carburators.
                    Any ideas, sugestion?
                    For what i know the force has to be direct, so it means to have the bar number "1" as short as posibble, How about if should be more short and its at maximum of the regulation with the screw (this is number 7 in the picture)
                    Thanks a lot
                    Attached Files

                    Comment

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