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DT125R FORUM

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  4. 3rd piston ring please help

3rd piston ring please help

Scheduled Pinned Locked Moved Engine
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  • CalumC Offline
    CalumC Offline
    Calum
    wrote on last edited by
    #5

    Something isn't right if you are losing compression mate.

    Are you sure this is what is happening?

    Always Originate, Never Pirate!

    declanD 1 Reply Last reply
    0
    • CalumC Calum

      Something isn't right if you are losing compression mate.

      Are you sure this is what is happening?

      declanD Offline
      declanD Offline
      declan
      wrote on last edited by
      #6

      @calum not at all I've got it down to either fueling under load or weak spark under load as on the garden it's okay but if I take it out and select 2nd the bike comes to a stop at the end of the gear then after that it starts running weird like a splutter withough the noise if you know what I mean then I have to push it as it won't ride at all but will still run and rev

      ZrakoZ 1 Reply Last reply
      1
      • declanD declan

        @calum not at all I've got it down to either fueling under load or weak spark under load as on the garden it's okay but if I take it out and select 2nd the bike comes to a stop at the end of the gear then after that it starts running weird like a splutter withough the noise if you know what I mean then I have to push it as it won't ride at all but will still run and rev

        ZrakoZ Offline
        ZrakoZ Offline
        Zrako
        wrote on last edited by
        #7

        @declan well , is your clutch set up properly? I mean the tension .

        1979 Jawa Mustang 50
        2003 Gilera DNA 125 R.I.P
        2015 Keeway TX 125 SM
        2006 Yamaha DT 125 X

        CalumC 1 Reply Last reply
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        • ZrakoZ Zrako

          @declan well , is your clutch set up properly? I mean the tension .

          CalumC Offline
          CalumC Offline
          Calum
          wrote on last edited by
          #8

          @zrako yeah, if it's losing power under load then it sounds like clutch is slipping.

          Always Originate, Never Pirate!

          declanD 1 Reply Last reply
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          • CalumC Calum

            @zrako yeah, if it's losing power under load then it sounds like clutch is slipping.

            declanD Offline
            declanD Offline
            declan
            wrote on last edited by
            #9

            @calum the clutch was in a bad state but since I got a new lever and adjuster it will pop the front wheel up but it's losing the power after initially using the clutch it feels good but after then it's losing power I don't believe it to be the clutch but I really thought it was till I got a new lever the other day before that I could redline drop the clutch and barely move

            ZrakoZ 1 Reply Last reply
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            • declanD declan

              @calum the clutch was in a bad state but since I got a new lever and adjuster it will pop the front wheel up but it's losing the power after initially using the clutch it feels good but after then it's losing power I don't believe it to be the clutch but I really thought it was till I got a new lever the other day before that I could redline drop the clutch and barely move

              ZrakoZ Offline
              ZrakoZ Offline
              Zrako
              wrote on last edited by
              #10

              @declan is there plenty of free play on the lever?

              1979 Jawa Mustang 50
              2003 Gilera DNA 125 R.I.P
              2015 Keeway TX 125 SM
              2006 Yamaha DT 125 X

              declanD 1 Reply Last reply
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              • ZrakoZ Zrako

                @declan is there plenty of free play on the lever?

                declanD Offline
                declanD Offline
                declan
                wrote on last edited by
                #11

                @zrako yes mate

                1 Reply Last reply
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                • CalumC Offline
                  CalumC Offline
                  Calum
                  wrote on last edited by
                  #12

                  Yeah but the load on the clutch in 1st is going to be minimal.

                  Always Originate, Never Pirate!

                  declanD 1 Reply Last reply
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                  • CalumC Calum

                    Yeah but the load on the clutch in 1st is going to be minimal.

                    declanD Offline
                    declanD Offline
                    declan
                    wrote on last edited by
                    #13

                    @calum so what would you lean to will bad plates have this effect?

                    CalumC 1 Reply Last reply
                    0
                    • declanD declan

                      @calum so what would you lean to will bad plates have this effect?

                      CalumC Offline
                      CalumC Offline
                      Calum
                      wrote on last edited by
                      #14

                      @declan Wouldn't be a bad place to start.

                      An idea would be to see if it pulls fine with no load on the engine.

                      So first just put the bike on a paddock, start it and go through all the gears. If that works no problems then jump on bike and od the same but keep it part throttle only. No load.

                      Always Originate, Never Pirate!

                      declanD 1 Reply Last reply
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                      • CalumC Calum

                        @declan Wouldn't be a bad place to start.

                        An idea would be to see if it pulls fine with no load on the engine.

                        So first just put the bike on a paddock, start it and go through all the gears. If that works no problems then jump on bike and od the same but keep it part throttle only. No load.

                        declanD Offline
                        declanD Offline
                        declan
                        wrote on last edited by
                        #15

                        @calum I've tried it with no load it works pretty much as it should

                        CalumC 1 Reply Last reply
                        0
                        • declanD declan

                          @calum I've tried it with no load it works pretty much as it should

                          CalumC Offline
                          CalumC Offline
                          Calum
                          wrote on last edited by
                          #16

                          @declan With load on the engine does it revs hard and no power. Clutch is slipping then.

                          Either adjust it or replace it.

                          Always Originate, Never Pirate!

                          declanD 1 Reply Last reply
                          0
                          • CalumC Calum

                            @declan With load on the engine does it revs hard and no power. Clutch is slipping then.

                            Either adjust it or replace it.

                            declanD Offline
                            declanD Offline
                            declan
                            wrote on last edited by
                            #17

                            @calum no it lacks power off the line when moving its decent shift into 3rd the revs die down to a slow idle and you go about 3mph

                            CalumC 2 Replies Last reply
                            0
                            • declanD declan

                              @calum no it lacks power off the line when moving its decent shift into 3rd the revs die down to a slow idle and you go about 3mph

                              CalumC Offline
                              CalumC Offline
                              Calum
                              wrote on last edited by
                              #18

                              @declan Nah doesn't sound like clutch then.

                              Sounds like it's a carb setting.

                              Take the plug out and have a look.

                              Could simply just not getting enough fuel.

                              Always Originate, Never Pirate!

                              declanD 1 Reply Last reply
                              0
                              • CalumC Calum

                                @declan Nah doesn't sound like clutch then.

                                Sounds like it's a carb setting.

                                Take the plug out and have a look.

                                Could simply just not getting enough fuel.

                                declanD Offline
                                declanD Offline
                                declan
                                wrote on last edited by
                                #19

                                @calum that's what I'm thinking as after I try hit 3rd and stop it feels starved not revving clean and real slow idle but sorts it's self out after a rest I've been doing some tests as it's got an open filter not the box as I have no rubber or filter for the air box but I haven noticed anything by restricting air flow

                                1 Reply Last reply
                                0
                                • declanD declan

                                  @calum no it lacks power off the line when moving its decent shift into 3rd the revs die down to a slow idle and you go about 3mph

                                  CalumC Offline
                                  CalumC Offline
                                  Calum
                                  wrote on last edited by
                                  #20

                                  @declan Sounds like fueling to me mate.

                                  Always Originate, Never Pirate!

                                  declanD 1 Reply Last reply
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                                  • CalumC Calum

                                    @declan Sounds like fueling to me mate.

                                    declanD Offline
                                    declanD Offline
                                    declan
                                    wrote on last edited by
                                    #21

                                    @calum I'll pick up a new carb and see how it goes thank you

                                    CalumC 1 Reply Last reply
                                    0
                                    • declanD declan

                                      @calum I'll pick up a new carb and see how it goes thank you

                                      CalumC Offline
                                      CalumC Offline
                                      Calum
                                      wrote on last edited by
                                      #22

                                      @declan Just sort heone you got outmate.

                                      Always Originate, Never Pirate!

                                      declanD 1 Reply Last reply
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                                      • CalumC Calum

                                        @declan Just sort heone you got outmate.

                                        declanD Offline
                                        declanD Offline
                                        declan
                                        wrote on last edited by
                                        #23

                                        @calum ive been through it more times I can count and never found any issues it's spotless and as for the settings I wouldn't have a clue I'm guess it's way lean on the a:f screw but it turns off on command when hot using the choke

                                        1 Reply Last reply
                                        0
                                        • J Offline
                                          J Offline
                                          Jens Eskildsen
                                          wrote on last edited by
                                          #24

                                          Sounds rich to me. Lean would cause a high hanging idle. The bike should still rev out, just without much power.

                                          When rich, everything is sluggish, and going WOT can feel like youre hitting a rev limiter, or as if the bike has a restriction.

                                          Have you done all the basics? Fresh plug and clean airfilter? Is your floathight correct?

                                          declanD 1 Reply Last reply
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