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DT125R FORUM

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  4. DTR 125 new piston ?

DTR 125 new piston ?

Scheduled Pinned Locked Moved DTR
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  • B Offline
    B Offline
    Blaze.Vile
    wrote on last edited by
    #1

    Today I was riding home when my dt lifted, then went back down (without any loud noise, bang or anything). After that my bike has now got extreme amounts of pull, what feels like a very small power-band at the most and sounds like that of a 4 stroke engine, the bike sounds deeper and the engine feels a lot softer than it used to. Could this be a sign that I will need a new piston or could it just be an air leak ?

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    • B Offline
      B Offline
      Blaze.Vile
      wrote on last edited by
      #2

      Also, the bike only gets up to 8k revs, feels like the powerband kicks in at about 5k instead of 6k and sounds nothing like a 2 stroke,

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

        You got the right colour powerband installed?

        Always Originate, Never Pirate!

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        • CalumC Calum

          You got the right colour powerband installed?

          B Offline
          B Offline
          Blaze.Vile
          wrote on last edited by
          #4

          @Calum I believe so. It's the same power band that has been installed for the last 1500 miles (in which it has been running fine) the bike has also lost the signature "brap" a 2 stroke usually has.

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          • CalumC Online
            CalumC Online
            Calum
            wrote on last edited by
            #5

            Best take the exhaust off and have a look up the port. See if the piston/bore is damaged.

            Always Originate, Never Pirate!

            B 1 Reply Last reply
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            • CalumC Calum

              Best take the exhaust off and have a look up the port. See if the piston/bore is damaged.

              B Offline
              B Offline
              Blaze.Vile
              wrote on last edited by Blaze.Vile
              #6

              @Calum There is no rattle at all, could there still be a possibility of a new piston ? Or could I just need to re pack my end can ? As the bike was bought second hand with the exhaust system already on it I cannot tell you how many miles it has been used for.

              CalumC 1 Reply Last reply
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              • B Blaze.Vile

                @Calum There is no rattle at all, could there still be a possibility of a new piston ? Or could I just need to re pack my end can ? As the bike was bought second hand with the exhaust system already on it I cannot tell you how many miles it has been used for.

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

                @Blaze-Vile Just take the exhaust off and have a nosey. Literally 10 minutes and you'll know if it needs a new piston.

                Always Originate, Never Pirate!

                B 1 Reply Last reply
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                • CalumC Calum

                  @Blaze-Vile Just take the exhaust off and have a nosey. Literally 10 minutes and you'll know if it needs a new piston.

                  B Offline
                  B Offline
                  Blaze.Vile
                  wrote on last edited by
                  #8

                  @Calum okay, just look for scratches on the barrel and wear on the piston ay ?

                  CalumC 1 Reply Last reply
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                  • B Blaze.Vile

                    @Calum okay, just look for scratches on the barrel and wear on the piston ay ?

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

                    @Blaze-Vile Yeah, see if the piston is damaged.

                    It could be that you have exhaust leakage.

                    Always Originate, Never Pirate!

                    B 1 Reply Last reply
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                    • CalumC Calum

                      @Blaze-Vile Yeah, see if the piston is damaged.

                      It could be that you have exhaust leakage.

                      B Offline
                      B Offline
                      Blaze.Vile
                      wrote on last edited by
                      #10

                      @Calum I've felt around the connections and I couldn't feel a leakage, No scratches on the piston or barrel either.

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                      • CalumC Online
                        CalumC Online
                        Calum
                        wrote on last edited by
                        #11

                        Power valve operating as expected

                        Always Originate, Never Pirate!

                        B 1 Reply Last reply
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                        • CalumC Calum

                          Power valve operating as expected

                          B Offline
                          B Offline
                          Blaze.Vile
                          wrote on last edited by
                          #12

                          @Calum The servo still moves it when the ignition turn on however the powerband opens up earlier than usual.

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