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DT125R FORUM

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  3. Bike running fast revs

Bike running fast revs

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  • CalumC Calum

    Air Leak

    declanD Offline
    declanD Offline
    declan
    wrote on last edited by
    #4

    @calum the idle scre has no effect I really think the revs stuck on but I don’t see how it’s possible since I have slack and smooth running cable

    1 Reply Last reply
    0
    • ZrakoZ Offline
      ZrakoZ Offline
      Zrako
      wrote on last edited by
      #5

      Do you have a nice play on throttle? Check the rubber if it sits nicely on filter housing.

      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

        Do you have a nice play on throttle? Check the rubber if it sits nicely on filter housing.

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

        @zrako yes it all seems sweet

        declanD 1 Reply Last reply
        0
        • declanD declan

          @zrako yes it all seems sweet

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

          @declan carb has been sealed so not debris can get in it

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          • CalumC Calum

            Air Leak

            declanD Offline
            declanD Offline
            declan
            wrote on last edited by
            #8

            @calum the cable has come out the carb again why has it done this again?

            CalumC 1 Reply Last reply
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            • declanD declan

              @calum the cable has come out the carb again why has it done this again?

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

              @declan Dunno mate. Have a look

              Always Originate, Never Pirate!

              declanD 1 Reply Last reply
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              • CalumC Calum

                @declan Dunno mate. Have a look

                declanD Offline
                declanD Offline
                declan
                wrote on last edited by
                #10

                @calum no idea why it was out it’s back in again do you have any tips to fit the carb rubber to the air box as I have a right shit time struggling to do it

                CalumC 1 Reply Last reply
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                • declanD declan

                  @calum no idea why it was out it’s back in again do you have any tips to fit the carb rubber to the air box as I have a right shit time struggling to do it

                  CalumC Offline
                  CalumC Offline
                  Calum
                  wrote on last edited by
                  #11

                  @declan Oh dear.

                  Yes, take the air filter out.

                  Work from inside of the box outwards.

                  Use a soft spudger (dull flat edge NOT A SCREW DRIVER!!!!!) to prise the angle of it into the box.

                  Once you learn how to do it, it's easy.

                  Do not force it in. It will go in without hesitation once you have that technique down

                  Always Originate, Never Pirate!

                  declanD 1 Reply Last reply
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                  • CalumC Calum

                    @declan Oh dear.

                    Yes, take the air filter out.

                    Work from inside of the box outwards.

                    Use a soft spudger (dull flat edge NOT A SCREW DRIVER!!!!!) to prise the angle of it into the box.

                    Once you learn how to do it, it's easy.

                    Do not force it in. It will go in without hesitation once you have that technique down

                    declanD Offline
                    declanD Offline
                    declan
                    wrote on last edited by
                    #12

                    @calum I’ve done it twice now and I hate it lol

                    CalumC 1 Reply Last reply
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                    • declanD declan

                      @calum I’ve done it twice now and I hate it lol

                      CalumC Offline
                      CalumC Offline
                      Calum
                      wrote on last edited by
                      #13

                      @declan Technique my boy! It's all in the technique.

                      Always Originate, Never Pirate!

                      declanD 1 Reply Last reply
                      0
                      • CalumC Calum

                        @declan Technique my boy! It's all in the technique.

                        declanD Offline
                        declanD Offline
                        declan
                        wrote on last edited by
                        #14

                        @calum lol got it in pretty easy but it’s still revving to the moon no air leaks cable is 100% free safe to say I’m pretty clue less and pissed off

                        CalumC 1 Reply Last reply
                        0
                        • declanD declan

                          @calum lol got it in pretty easy but it’s still revving to the moon no air leaks cable is 100% free safe to say I’m pretty clue less and pissed off

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

                          @declan If it was working fine before hand, then it's going to be something properly simple. Rushing isn't going to fix the problem.

                          My guess is that it's an air leak, because this is the most common type of problem.

                          The inlet manifold gasket should be renewed. As said previously, these are prone to failure upon renewal.

                          You said your inlet had a split in it, have you replaced the inlet? Sounds like it's past its best and I would renew it with a new one whilsy Yamaha still make them...

                          Always Originate, Never Pirate!

                          declanD 1 Reply Last reply
                          0
                          • CalumC Calum

                            @declan If it was working fine before hand, then it's going to be something properly simple. Rushing isn't going to fix the problem.

                            My guess is that it's an air leak, because this is the most common type of problem.

                            The inlet manifold gasket should be renewed. As said previously, these are prone to failure upon renewal.

                            You said your inlet had a split in it, have you replaced the inlet? Sounds like it's past its best and I would renew it with a new one whilsy Yamaha still make them...

                            declanD Offline
                            declanD Offline
                            declan
                            wrote on last edited by
                            #16

                            @calum your right it just has to be an air leak there’s no other explanation so if I use wd40 should I be looking for bubbles as rpm change will not be reliable

                            CalumC 1 Reply Last reply
                            0
                            • declanD declan

                              @calum your right it just has to be an air leak there’s no other explanation so if I use wd40 should I be looking for bubbles as rpm change will not be reliable

                              CalumC Offline
                              CalumC Offline
                              Calum
                              wrote on last edited by
                              #17

                              @declan The added WD-40 should be combustable, bringing the mixture down so the idle should drop.

                              It'll be something simple. It might be that the reeds are installed incorrectly. Too Much overlap at the end etc...

                              Always Originate, Never Pirate!

                              declanD 1 Reply Last reply
                              0
                              • CalumC Calum

                                @declan The added WD-40 should be combustable, bringing the mixture down so the idle should drop.

                                It'll be something simple. It might be that the reeds are installed incorrectly. Too Much overlap at the end etc...

                                declanD Offline
                                declanD Offline
                                declan
                                wrote on last edited by
                                #18

                                @calum checked before install they were a perfect fit and actuall were the same ones that were already in there

                                declanD 1 Reply Last reply
                                1
                                • declanD declan

                                  @calum checked before install they were a perfect fit and actuall were the same ones that were already in there

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

                                  @declan should there be a gasket between the engine and the reed block spacer

                                  CalumC 1 Reply Last reply
                                  0
                                  • O Offline
                                    O Offline
                                    oldman
                                    wrote on last edited by
                                    #20

                                    Yes 0_1507742590451_20171011_182026-979x1305.jpg

                                    1 Reply Last reply
                                    2
                                    • declanD declan

                                      @declan should there be a gasket between the engine and the reed block spacer

                                      CalumC Offline
                                      CalumC Offline
                                      Calum
                                      wrote on last edited by
                                      #21

                                      @declan That was literally one of the things I rattled off before hand...

                                      Always Originate, Never Pirate!

                                      declanD 1 Reply Last reply
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                                      • CalumC Calum

                                        @declan That was literally one of the things I rattled off before hand...

                                        declanD Offline
                                        declanD Offline
                                        declan
                                        wrote on last edited by
                                        #22

                                        @calum yes but my bike doesent have one @oldman is there two of those gaskets?

                                        CalumC 1 Reply Last reply
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                                        • declanD declan

                                          @calum yes but my bike doesent have one @oldman is there two of those gaskets?

                                          CalumC Offline
                                          CalumC Offline
                                          Calum
                                          wrote on last edited by Calum
                                          #23

                                          @declan No

                                          alt text

                                          Item 8 and be sure to buy either genuine or Athena.

                                          As said, it's common for them to go there on these bikes because people either do naff copies, use inferior parts or reuse gaskets.

                                          Always Originate, Never Pirate!

                                          declanD 1 Reply Last reply
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