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DT125R FORUM

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  4. Dt125 mikuni carb

Dt125 mikuni carb

Scheduled Pinned Locked Moved Carburetor
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  • Irongamer727I Irongamer727

    My Haynes manual says stock pilot jet fit the Dtx is 17.5? What the hell? Thought it was 25.

    K Offline
    K Offline
    kevin
    wrote on last edited by
    #15

    @irongamer727 first flatslides came with 22.5 and later models 17.5 and 210 mainjet

    Irongamer727I 1 Reply Last reply
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    • K kevin

      @irongamer727 first flatslides came with 22.5 and later models 17.5 and 210 mainjet

      Irongamer727I Offline
      Irongamer727I Offline
      Irongamer727
      wrote on last edited by
      #16

      @kevin Alright, thx

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      • Irongamer727I Offline
        Irongamer727I Offline
        Irongamer727
        wrote on last edited by
        #17

        So I was finally able to unscrew my pilot jet for my dtx. It is a nightmare to start now with the Athena kit. I looked in the Haynes manual and it claimed stock pilot jet for the dtx was 17.5.
        Mine was a 35! What on earth? How is it possible it is hard to start NOW and not when it was 100% stock?

        Pilot jet size 35 https://imgur.com/gallery/fS02dV8

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        • Irongamer727I Offline
          Irongamer727I Offline
          Irongamer727
          wrote on last edited by
          #18

          Either way, it is too big right?

          1 Reply Last reply
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          • Irongamer727I Offline
            Irongamer727I Offline
            Irongamer727
            wrote on last edited by
            #19

            Response please...

            K 1 Reply Last reply
            0
            • CalumC Offline
              CalumC Offline
              Calum
              wrote on last edited by
              #20

              Ask any tuner how to set up a carburettor and you'll get the same response.

              It depends on your setup.

              Everything from Atmospheric conditions to state of the engine and even altitude will affect jetting.

              It's imperative that ones carb is tuned to these varying conditions.

              20 years ago, Yamaha spent thousands on designing the perfect carburettor settings to get the DT roughly in the right ball park.

              The moment you started modifying the bike, you throw all of Yamaha's hard work out the window.

              Just because it had some ridiculous settings on it, doesn't necessarily mean it was wrong.

              Jetting should be done to suit, and there is reams of guides on here to help you get the bike in right area.

              Always Originate, Never Pirate!

              Irongamer727I 1 Reply Last reply
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              • CalumC Calum

                Ask any tuner how to set up a carburettor and you'll get the same response.

                It depends on your setup.

                Everything from Atmospheric conditions to state of the engine and even altitude will affect jetting.

                It's imperative that ones carb is tuned to these varying conditions.

                20 years ago, Yamaha spent thousands on designing the perfect carburettor settings to get the DT roughly in the right ball park.

                The moment you started modifying the bike, you throw all of Yamaha's hard work out the window.

                Just because it had some ridiculous settings on it, doesn't necessarily mean it was wrong.

                Jetting should be done to suit, and there is reams of guides on here to help you get the bike in right area.

                Irongamer727I Offline
                Irongamer727I Offline
                Irongamer727
                wrote on last edited by
                #21

                @calum guess so. Only way is to buy and try stuff I guess

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                • Irongamer727I Irongamer727

                  Response please...

                  K Offline
                  K Offline
                  kevin
                  wrote on last edited by
                  #22

                  @irongamer727 I’m a firm believer in leaving things the way they are and not thinking I’m better than the designers.
                  To answer your question 35 is very big for your carb.
                  Does Athena give any tips on resetting.
                  You say it’s hard to start, have you checked the fuel feed pipe when the cold start lever is on as it’s very narrow and often gets blocked.

                  Irongamer727I 1 Reply Last reply
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                  • K kevin

                    @irongamer727 I’m a firm believer in leaving things the way they are and not thinking I’m better than the designers.
                    To answer your question 35 is very big for your carb.
                    Does Athena give any tips on resetting.
                    You say it’s hard to start, have you checked the fuel feed pipe when the cold start lever is on as it’s very narrow and often gets blocked.

                    Irongamer727I Offline
                    Irongamer727I Offline
                    Irongamer727
                    wrote on last edited by
                    #23

                    @kevin nope. Athena don't give any recommendations at all. Do you mean the fuel hose itself? That's brand new. The choke works, could there be some debris in the mechanism you think?

                    K 1 Reply Last reply
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                    • Irongamer727I Irongamer727

                      @kevin nope. Athena don't give any recommendations at all. Do you mean the fuel hose itself? That's brand new. The choke works, could there be some debris in the mechanism you think?

                      K Offline
                      K Offline
                      kevin
                      wrote on last edited by
                      #24

                      @irongamer727 thin brass pipe near to the hole the pilot jet drops in is the fuel pipe whilst on the choke cycle, very thin wire needs poking down to the bottom and then through the cross holes.

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                      • Irongamer727I Offline
                        Irongamer727I Offline
                        Irongamer727
                        wrote on last edited by
                        #25

                        Alright so as I'm getting progressively better at them wheelies and can ride longer, I've noticed stuff. The carb wants to piss out the transparent liquid gold (petrol).

                        Is tilting the carb the only way to go? Or could a float adjustment do the trick?

                        CalumC 1 Reply Last reply
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                        • Irongamer727I Irongamer727

                          Alright so as I'm getting progressively better at them wheelies and can ride longer, I've noticed stuff. The carb wants to piss out the transparent liquid gold (petrol).

                          Is tilting the carb the only way to go? Or could a float adjustment do the trick?

                          CalumC Offline
                          CalumC Offline
                          Calum
                          wrote on last edited by
                          #26

                          @irongamer727 Sounds like the flat is causing you issues.

                          Always Originate, Never Pirate!

                          Irongamer727I 1 Reply Last reply
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                          • CalumC Calum

                            @irongamer727 Sounds like the flat is causing you issues.

                            Irongamer727I Offline
                            Irongamer727I Offline
                            Irongamer727
                            wrote on last edited by
                            #27

                            @calum the flat?

                            CalumC 1 Reply Last reply
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                            • Irongamer727I Irongamer727

                              @calum the flat?

                              CalumC Offline
                              CalumC Offline
                              Calum
                              wrote on last edited by
                              #28

                              @irongamer727 Float sorry.

                              Always Originate, Never Pirate!

                              Irongamer727I 1 Reply Last reply
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                              • CalumC Calum

                                @irongamer727 Float sorry.

                                Irongamer727I Offline
                                Irongamer727I Offline
                                Irongamer727
                                wrote on last edited by
                                #29

                                @calum would I want to raise or lower it?

                                CalumC 1 Reply Last reply
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                                • Irongamer727I Irongamer727

                                  @calum would I want to raise or lower it?

                                  CalumC Offline
                                  CalumC Offline
                                  Calum
                                  wrote on last edited by
                                  #30

                                  @irongamer727 Just make sure it's shutting off the fuel bud

                                  Always Originate, Never Pirate!

                                  Irongamer727I 1 Reply Last reply
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                                  • CalumC Calum

                                    @irongamer727 Just make sure it's shutting off the fuel bud

                                    Irongamer727I Offline
                                    Irongamer727I Offline
                                    Irongamer727
                                    wrote on last edited by Irongamer727
                                    #31

                                    @calum won't that affect my crusing, regular riding?

                                    I mean the carb will tilt almost 90° on a real wheelie.

                                    I've spoken to some guys really good at that rear wheel (they ride a dt) and some of them just plug the overflow. But I mean it's clearly leaking for a reason. Can't understand how plugging the owerflow works.

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                                    • Glynn123G Offline
                                      Glynn123G Offline
                                      Glynn123
                                      wrote on last edited by
                                      #32

                                      As far as I'm aware if you plug the overflow it will still dump the fuel, but it will dump it out the rear intake of the carb into the airbox, which will then get sucked into the engine. Never had or seen any problems with standard Dt carb during wheelies, and I know people who regularly scrape and coast.

                                      Irongamer727I 1 Reply Last reply
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                                      • Glynn123G Glynn123

                                        As far as I'm aware if you plug the overflow it will still dump the fuel, but it will dump it out the rear intake of the carb into the airbox, which will then get sucked into the engine. Never had or seen any problems with standard Dt carb during wheelies, and I know people who regularly scrape and coast.

                                        Irongamer727I Offline
                                        Irongamer727I Offline
                                        Irongamer727
                                        wrote on last edited by
                                        #33

                                        @glynn123 someone's got to be the first😛🔫

                                        Glynn123G 1 Reply Last reply
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                                        • Irongamer727I Irongamer727

                                          @glynn123 someone's got to be the first😛🔫

                                          Glynn123G Offline
                                          Glynn123G Offline
                                          Glynn123
                                          wrote on last edited by
                                          #34

                                          @irongamer727 doesn't seem like you're having much luck with this build mate haha

                                          Irongamer727I 1 Reply Last reply
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