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DT125R FORUM

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Under power

Scheduled Pinned Locked Moved Welcome New Owners!
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  • shaunp1912S Offline
    shaunp1912S Offline
    shaunp1912
    wrote on last edited by
    #1

    Got myself a 1990 dt125r starts first kick and runs through the gears great but flat out struggling to hit 60 mph
    Just serviced by me new air filter oil new full exhaust
    Revs fine up to 9500 but just doesn’t feel right, last one I had hit 75 plus no issues
    Any ideas

    RandallR 1 Reply Last reply
    0
    • shaunp1912S shaunp1912

      Got myself a 1990 dt125r starts first kick and runs through the gears great but flat out struggling to hit 60 mph
      Just serviced by me new air filter oil new full exhaust
      Revs fine up to 9500 but just doesn’t feel right, last one I had hit 75 plus no issues
      Any ideas

      RandallR Offline
      RandallR Offline
      Randall
      wrote on last edited by
      #2

      @shaunp1912 check behind the clocks for a reed valve switch little green thing In a glass tube tape it up put some vas on it to stop it getting damp should re-restrict it depending if it's the dtr pre 2003 if it's the re2004 model then it's electrical to de restrict

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      • CalumC Offline
        CalumC Offline
        Calum
        wrote on last edited by
        #3

        Sounds like powervalve to me.

        Always Originate, Never Pirate!

        shaunp1912S 1 Reply Last reply
        0
        • CalumC Calum

          Sounds like powervalve to me.

          shaunp1912S Offline
          shaunp1912S Offline
          shaunp1912
          wrote on last edited by
          #4

          @Calum
          I have just removed the power valve cover the power valve does not move when I rev the cables are attached, what could be the issue

          CalumC 1 Reply Last reply
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          • shaunp1912S shaunp1912

            @Calum
            I have just removed the power valve cover the power valve does not move when I rev the cables are attached, what could be the issue

            CalumC Offline
            CalumC Offline
            Calum
            wrote on last edited by
            #5

            @shaunp1912 Don't worry about that for now.

            Just make sure the valve is completely open, then disconnect the servo. Then take the bike for a spin.

            It'll be down on bottom end, but should pull hard to the red line. If it doesn't then it'll be something else.

            Always Originate, Never Pirate!

            1 Reply Last reply
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            • shaunp1912S Offline
              shaunp1912S Offline
              shaunp1912
              wrote on last edited by
              #6

              Is the power valve controlled electricly ?
              As my battery is flat and won’t hold a charge,

              CalumC 1 Reply Last reply
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              • shaunp1912S shaunp1912

                Is the power valve controlled electricly ?
                As my battery is flat and won’t hold a charge,

                CalumC Offline
                CalumC Offline
                Calum
                wrote on last edited by
                #7

                @shaunp1912 The DTR's, unlike the E, don't generate enough power to operate the electrical components properly. A flat battery, even on an E, causes issues with the valve.

                So that sounds like your problem.

                Always Originate, Never Pirate!

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