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DT125R FORUM

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  3. 2003 DT125R tops out at 65mph ?

2003 DT125R tops out at 65mph ?

Scheduled Pinned Locked Moved Tuning
15 Posts 8 Posters 2.1k Views
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  • CalumC Offline
    CalumC Offline
    Calum
    wrote on last edited by
    #2

    Have you tried just pinning the powervalve in the open position. If the reed switch has been removed then you should be able to get max revs. So it sounds like a PV issue to me.

    Always Originate, Never Pirate!

    1 Reply Last reply
    0
    • 2 Offline
      2 Offline
      2stroketerry
      wrote on last edited by
      #3

      Hi @Calum when I turn my ignition on the powervalve goes through cleaning cycle then stops with notch in pully lined up exactly with the hole behind it. The bike is an import and supposed to be fully working powervalve, has plenty of power bottom end and can feel the powervalve come in around 7,000rpm. Just won't rev past 8500 or 65mph for some reason, don't know if silencer is holding me back and no idea what the silencer is just says 3MB on it. The hole in silencer is smaller than it looks from the side, should I get another silencer ?
      0_1519594913077_t.JPG

      0_1519594926687_kl.JPG

      declanD 1 Reply Last reply
      0
      • F Offline
        F Offline
        finnerz89
        wrote on last edited by
        #4

        Still sound restricted to me mate. Who moved the reed switch?

        Current bikes:
        DT125X '07
        Street Triple R '11
        Aprilia ETV1000 '02

        Previous:
        DR650RSE '96
        FJ1200 '92

        CalumC 1 Reply Last reply
        1
        • F finnerz89

          Still sound restricted to me mate. Who moved the reed switch?

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

          @2stroketerry Yeah I just want to rule it out bud. When the valve is lined perfectly with the exhaust port (I recommend taking the exhaust off and double checking, disconnect the valve completely from the loom so that it cannot operate. Then go and take the bike for a blast up a dual carriage way. Should pull hard to the red line with compromised power below 6K. If that's the case, then you know the PV isn't setup probably.

          Always Originate, Never Pirate!

          1 Reply Last reply
          0
          • J Offline
            J Offline
            Jens Eskildsen
            wrote on last edited by
            #6

            Some upjet a lot with a different exhaust, eventhough its rarely needed.
            How big is the mainjet? Try a stock sized.

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            0
            • 2 2stroketerry

              Hi @Calum when I turn my ignition on the powervalve goes through cleaning cycle then stops with notch in pully lined up exactly with the hole behind it. The bike is an import and supposed to be fully working powervalve, has plenty of power bottom end and can feel the powervalve come in around 7,000rpm. Just won't rev past 8500 or 65mph for some reason, don't know if silencer is holding me back and no idea what the silencer is just says 3MB on it. The hole in silencer is smaller than it looks from the side, should I get another silencer ?
              0_1519594913077_t.JPG

              0_1519594926687_kl.JPG

              declanD Offline
              declanD Offline
              declan
              wrote on last edited by
              #7

              @2stroketerry I found out when the pv is lined up with the hole it’s not correct it’s still part closed so as @Calum says take the exhaust off and do it properly

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              • 2 Offline
                2 Offline
                2stroketerry
                wrote on last edited by
                #8

                Hi , yes going to do what @Calum said and remove the exhaust and make sure fully open then unplug my servo from the harness. Can't do it at the moment as my bike is outside and it's -4 and snowing so will have to wait for better weather, my girlfriend won't let me bring it in the kitchen to work on it. She went mad the other day when she got home and found the kitchen table and chairs all took apart, just need to bribe her.lol

                CalumC 1 Reply Last reply
                0
                • 2 2stroketerry

                  Hi , yes going to do what @Calum said and remove the exhaust and make sure fully open then unplug my servo from the harness. Can't do it at the moment as my bike is outside and it's -4 and snowing so will have to wait for better weather, my girlfriend won't let me bring it in the kitchen to work on it. She went mad the other day when she got home and found the kitchen table and chairs all took apart, just need to bribe her.lol

                  CalumC Offline
                  CalumC Offline
                  Calum
                  wrote on last edited by
                  #9

                  @2stroketerry Some girlfriend....Tell her I said that by the way

                  Always Originate, Never Pirate!

                  1 Reply Last reply
                  1
                  • 2 Offline
                    2 Offline
                    2stroketerry
                    wrote on last edited by
                    #10

                    Yes @Calum terrible and I bought her an Astra for xmas top of the range Elite that cost me £7000.

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                    0
                    • 2 Offline
                      2 Offline
                      2stroketerry
                      wrote on last edited by
                      #11

                      Wanted to treat myself to this to replace crappy shed she keeps her lawnmowers etc in but can't have it she said as takes up too much Lawn, garden mad she is so all I get is a bit of patio.lol
                      https://www.gardenbuildingsdirect.co.uk/wooden-storage/billyoh-28mm-premium-motorbike-store

                      1 Reply Last reply
                      1
                      • Sgt Robuck 5S Offline
                        Sgt Robuck 5S Offline
                        Sgt Robuck 5
                        wrote on last edited by
                        #12

                        dump her mate XD

                        1 Reply Last reply
                        0
                        • Irongamer727I Offline
                          Irongamer727I Offline
                          Irongamer727
                          wrote on last edited by
                          #13

                          Agree, it's for the best.

                          1 Reply Last reply
                          1
                          • terry.tzT Offline
                            terry.tzT Offline
                            terry.tz
                            wrote on last edited by
                            #14

                            its never going to work out :face_with_tears_of_joy: :face_with_tears_of_joy: :face_with_tears_of_joy: 🤣

                            "Muddy water is best cleared by leaving it alone" Alan Watts

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                            1
                            • CalumC Offline
                              CalumC Offline
                              Calum
                              wrote on last edited by
                              #15

                              Oh dear, back on topic anyhow....Let us know how you get on with the PV. If it still struggling then it would sound like it's still restricted and needs sorting ASAP! 2003 models were the WORST for restrictions!

                              Always Originate, Never Pirate!

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