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DT125R FORUM

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  3. Bike will start but not Tick over ?

Bike will start but not Tick over ?

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  • CalumC Calum

    @Leftyno1 Definitely would not recommend 180 main jet.

    Have yoy read the guide on tuning carbs on here?

    The main jet has nothing to do with idle!

    Very odd why that has sorted itself out.

    Is the needle correct?

    180 main jet will cause it to lean out on wide open throttle.

    Of course every engine is different and no two jettings will work the same. But Yamaha set it to 240 for a reason.

    Definitely seems like an underlying problem.

    Leftyno1L Offline
    Leftyno1L Offline
    Leftyno1
    wrote on last edited by
    #15

    @Calum Yes agree it does seem small took it out and engine is smoking when revved hard but also clutch slipping at 5500 rpm I changed oil Castrol GTX 10w 30 oil ,so something new to investigate changed oil because it was slipping a bit before .
    Going to try 230 Jet back in tomorrow and see how it goes but bike is definitely not running lean as I leave a trail of smoke every where like a good un.,but it is ticking over well and not cutting out like before.

    CalumC 1 Reply Last reply
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    • Leftyno1L Leftyno1

      @Calum Yes agree it does seem small took it out and engine is smoking when revved hard but also clutch slipping at 5500 rpm I changed oil Castrol GTX 10w 30 oil ,so something new to investigate changed oil because it was slipping a bit before .
      Going to try 230 Jet back in tomorrow and see how it goes but bike is definitely not running lean as I leave a trail of smoke every where like a good un.,but it is ticking over well and not cutting out like before.

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

      @Leftyno1 Just because it smokes doesn't mean its not running lean.

      Sounds like if it's smoking excessively that the oil is too rich. However the fuel, which remember is critical in keeping yhe engine cool, can still run lean!

      The oil is controlled via a separate pump and bares no relation to the fuel.

      If the clutch is slipping then it could be assembled incorrectly. I have described how to balance the clutch amd install it on this forum.

      Always Originate, Never Pirate!

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

        Do not despair, five minute job worth doing right to avoid catastrophic failure!

        Always Originate, Never Pirate!

        Leftyno1L 2 Replies Last reply
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        • CalumC Calum

          Do not despair, five minute job worth doing right to avoid catastrophic failure!

          Leftyno1L Offline
          Leftyno1L Offline
          Leftyno1
          wrote on last edited by
          #18

          @Calum Just remembered when engine seized I sprayed some WD (moment of madness) in Barrel so Transmission oil probably contaminated which in turn probably contaminated clutch plates so even though I've changed the oil it is still on the plates themselves .
          will fit the 240 jet in morning and see how it runs, this bike is like a show jumping horse always another fence to clear it is now the most worked on Bike I have ever owned not feeling the love at this moment lol.

          CalumC 1 Reply Last reply
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          • Leftyno1L Leftyno1

            @Calum Just remembered when engine seized I sprayed some WD (moment of madness) in Barrel so Transmission oil probably contaminated which in turn probably contaminated clutch plates so even though I've changed the oil it is still on the plates themselves .
            will fit the 240 jet in morning and see how it runs, this bike is like a show jumping horse always another fence to clear it is now the most worked on Bike I have ever owned not feeling the love at this moment lol.

            CalumC Offline
            CalumC Offline
            Calum
            wrote on last edited by
            #19

            @Leftyno1 Doubt the wd will cause the plates to slip.

            I appreciate how you feel but these bikes take such a battering it's amazing there are still so many left.

            Always Originate, Never Pirate!

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            • Leftyno1L Offline
              Leftyno1L Offline
              Leftyno1
              wrote on last edited by
              #20

              Well thats good news about the WD and clutch, after rebuild Clutch was way out and took a lot of adjustment ,will check tutorial link and also have a haynes so maybe he says with fingers crossed it might just need adjusting. But with cars i have found once there slipping you have to change them ,is it the same with the DT.

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              • Leftyno1L Offline
                Leftyno1L Offline
                Leftyno1
                wrote on last edited by
                #21

                240 jet fitted and running just as well ,ticking over nicely got a jet change down to 20 minutes thanks to plug on bottom of bowl ,could not face another re-bore as 5000 miles from mechanic lol, now just clutch to adjust, cheers for help so far.

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                • Leftyno1L Offline
                  Leftyno1L Offline
                  Leftyno1
                  wrote on last edited by
                  #22

                  Set clutch up took 5 minutes and yes the bike is running like a good un no clutch slip ,and no smoke trail any more correct Jet maybe or carb was not set right anyway all is good ,and feeling the love once more, now just another 450 miles and it is run in .Thanks for help.

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                  • CalumC Calum

                    Do not despair, five minute job worth doing right to avoid catastrophic failure!

                    Leftyno1L Offline
                    Leftyno1L Offline
                    Leftyno1
                    wrote on last edited by
                    #23

                    @Calum Hi Calum
                    Bike running perfect, thanks for help, posted what I did so Post is complete, my pet hate on another forum was old posts that were void of the fix or work done. Thanks again.

                    CalumC 1 Reply Last reply
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                    • Leftyno1L Leftyno1

                      @Calum Hi Calum
                      Bike running perfect, thanks for help, posted what I did so Post is complete, my pet hate on another forum was old posts that were void of the fix or work done. Thanks again.

                      CalumC Offline
                      CalumC Offline
                      Calum
                      wrote on last edited by
                      #24

                      @Leftyno1 yeah nice one man.

                      Yes and no. Of course when the clutch wears significantly it will slip. But it will not disengaged before it slips so theres that.

                      What I mean is when the clutch is on ots way out. With the clutch lever pulled in the clutch with not disengage and still pass power to the wheels.

                      You them adjust it to its max setting on yhe lever, perch and clutch drum. If that still fails then new plates amd springs.

                      But I mean you would need serious mileage before that happens. By which time you will do a full engine rebuild and why you wouldn't build yhe clutxh at that stage is madness.

                      Always Originate, Never Pirate!

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