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DT125R FORUM

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  4. Jetting the carb

Jetting the carb

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

    Was it doing this before the exhaust change?

    Always Originate, Never Pirate!

    1 Reply Last reply
    1
    • E Offline
      E Offline
      Elan n
      wrote last edited by
      #6

      @calum @hotshot-iii yes i did a full carb clean, took everything apart and cleaned it and i dont know, the seller told me it drives good and gave the original exhaust with the bike too. I also ordered an fully overhauled carb to replace it. Came in today and dontacted the seller from the exhaust and told me to use a 245 jet but havent tried it yet. Tomorrow im gonna install everything back

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      • R Offline
        R Offline
        Rallyfinnen
        wrote last edited by
        #7

        You should get a set of main jets and go up in size significantly until it runs too rich, then start going down until you find the sweet spot. You might need to raise the needle too if it bogs when you twist the throttle. You will probably notice problems when running abt half throttle if the needle is wrong. Keep an eye on the plug when you are jetting, if you have some experience in jetting, the feel and sound of the engine will tell you when you are close. I sometimes use Chinese jet kits and think they work ok, especially for the price, but you can't compare the numbering on them with anything else, you have to stay with that kit when you are jetting.

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        • E Offline
          E Offline
          Elan n
          wrote last edited by
          #8

          @rallyfinnen installed the overhauled carb, tried a whole lot of jets and ended with 210 but now it suddenly runs really bad, cant get past 4k rpm because it stutters really hard, sounds like a rev limiter.

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          0
          • R Offline
            R Offline
            Rallyfinnen
            wrote last edited by
            #9

            Then I guess it's ignition related, might be hard to find the problem..

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            0
            • CalumC Offline
              CalumC Offline
              Calum
              wrote last edited by
              #10

              Are you using a genuine coil?

              I had something very similar with a Chinese 'race' coil. Took me absolutely ages to get to the bottom of as I rebuilt the whole bike from the ground up and the coil was one of an assortment of new parts.

              So I am very wary now of aftermarket coils.

              Always Originate, Never Pirate!

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              • E Offline
                E Offline
                Elan n
                wrote last edited by
                #11

                @calum found the problem, servo cable snapped so the powervalve didnt work properly.

                HOTSHOT IIIH 1 Reply Last reply
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                • E Elan n

                  @calum found the problem, servo cable snapped so the powervalve didnt work properly.

                  HOTSHOT IIIH Online
                  HOTSHOT IIIH Online
                  HOTSHOT III
                  wrote last edited by
                  #12

                  @Elan-n You can make your own using stainless MTB gear cables, use the inline cable oilers as well and you can quickly re-lube them after every wash:

                  https://dt125r.co.uk/post/28693

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                  • E Offline
                    E Offline
                    Elan n
                    wrote last edited by
                    #13
                    This post is deleted!
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                    • E Offline
                      E Offline
                      Elan n
                      wrote last edited by
                      #14

                      @calum @hotshot-iii @rallyfinnen All right! But so abaut the jetting, so i should have no restrictions on my 2006 dtx. The only upgrades that i have are the reeds that were switched to carbon ones and a spacer between the intake and the reeds. and also the purtagal pipe from romeuhenriques. Current jetting is: idle 17.5 and main 210. Am i supposed to follow the older model with the 240 jets or what should i start with?

                      HOTSHOT IIIH 1 Reply Last reply
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                      • CalumC Offline
                        CalumC Offline
                        Calum
                        wrote last edited by
                        #15

                        Go with the 210 main jet, do a plug chop and adjust to suit.

                        The CDI on the 2006 DTX (at least in the UK) is restricted. So you won't be getting full power until you derestrict it, even then the performance is still stifled.

                        Biggest upgrade I noticed to overall performance was a Zeeltronic ignition system.

                        Vastly improved the performance on my DTRE.

                        Always Originate, Never Pirate!

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                        • E Elan n

                          @calum @hotshot-iii @rallyfinnen All right! But so abaut the jetting, so i should have no restrictions on my 2006 dtx. The only upgrades that i have are the reeds that were switched to carbon ones and a spacer between the intake and the reeds. and also the purtagal pipe from romeuhenriques. Current jetting is: idle 17.5 and main 210. Am i supposed to follow the older model with the 240 jets or what should i start with?

                          HOTSHOT IIIH Online
                          HOTSHOT IIIH Online
                          HOTSHOT III
                          wrote last edited by
                          #16

                          @Elan-n Agree with @calum about the Zeeltronic, I enjoyed the process of installing mine and making it look as stock as possible.

                          Re jetting, I think I'd be contacting Romeu Henriques, tell him about your other mods (intake spacer dimensions etc.) and see what he says. Everyone speaks very highly of his exhaust systems so he will probably have enough knowledge to plug the numbers into some two-stroke tuning equations and help you out.

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