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DT125R FORUM

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  4. Whats a good carburetor for my DT125 with a 170cc athena cylinder kit?

Whats a good carburetor for my DT125 with a 170cc athena cylinder kit?

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carburetor
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  • CalumC Calum

    @claws You'd be surprised.

    I'm not going into the specifics.

    But Pressure=force/area

    The force is generated via the vacuum of the engine, the area is the size of the carb.

    If the carb increases sizes, but the vacuum remains the same then you will see a drop in pressure. Aka, the pressure to actuate the carb will lower and it may not be as effective, sine the carb works off the venturi effect, getting this balance right is important. Going too big can have adverse affects. Is 36mm too big? I'm not saying that, I'm just saying bigger is not always better.

    clawsC Offline
    clawsC Offline
    claws
    wrote on last edited by
    #19

    @Calum of course a bigger carburetor isnt always better but i dont think that i can go slower with the keihin and if i cant get it to run great with the bike i will trade it for a smaller one. but a guy that i know put a 38mm carb in his 1998 dt125r and said that it runs great. still i believe that the new carburetor will out perform the one i have now but if it doesnt i will be a bit disappointed but anyways i wont lose anything with this new carb

    2̶0̶0̶4̶ ̶D̶T̶1̶2̶5̶R̶E̶ ̶w̶i̶t̶h̶ ̶s̶u̶p̶e̶r̶m̶o̶t̶o̶ ̶w̶h̶e̶e̶l̶s̶ ̶a̶n̶d̶ ̶a̶ ̶1̶7̶0̶c̶c̶ ̶a̶t̶h̶e̶n̶a̶ ̶k̶i̶t̶
    1999 YZ250 with a 1999 DTR VIN

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

      Oh yeah! Report back to us your findings 😃

      Always Originate, Never Pirate!

      1 Reply Last reply
      1
      • clawsC claws

        @Darty cant be slower than now though

        DartyD Offline
        DartyD Offline
        Darty
        wrote on last edited by Darty
        #21

        @claws True, but don't forget you'll make less power under 6-8k Rpm.

        @Calum lol I don't have much to say about these bikes anymore

        Keep it real

        clawsC CalumC declanD NINJAN 4 Replies Last reply
        1
        • DartyD Darty

          @claws True, but don't forget you'll make less power under 6-8k Rpm.

          @Calum lol I don't have much to say about these bikes anymore

          clawsC Offline
          clawsC Offline
          claws
          wrote on last edited by
          #22

          @Darty doesnt matter. it doesnt have much torque in the lower rpms but its because my ypvs is locked to the up right position. gonna get it resolved as well and maybe get an athena pipe for the bike since its made for the 170cc cylinder kit

          2̶0̶0̶4̶ ̶D̶T̶1̶2̶5̶R̶E̶ ̶w̶i̶t̶h̶ ̶s̶u̶p̶e̶r̶m̶o̶t̶o̶ ̶w̶h̶e̶e̶l̶s̶ ̶a̶n̶d̶ ̶a̶ ̶1̶7̶0̶c̶c̶ ̶a̶t̶h̶e̶n̶a̶ ̶k̶i̶t̶
          1999 YZ250 with a 1999 DTR VIN

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          0
          • Glynn123G Offline
            Glynn123G Offline
            Glynn123
            wrote on last edited by
            #23

            Jetting a none standard carb on a DT is a ballache, 32mm polini pwk didn't make my DT much faster at all without any supporting mods like ignition etc. The fuel usage was well over double too even with both carbs appropriately jetted.

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            • DartyD Darty

              @claws True, but don't forget you'll make less power under 6-8k Rpm.

              @Calum lol I don't have much to say about these bikes anymore

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

              @Darty Join the club. But most of us talk about different projects these days.

              Always Originate, Never Pirate!

              clawsC 1 Reply Last reply
              0
              • DartyD Darty

                @claws True, but don't forget you'll make less power under 6-8k Rpm.

                @Calum lol I don't have much to say about these bikes anymore

                declanD Offline
                declanD Offline
                declan
                wrote on last edited by
                #25

                @Darty we kinda miss ya around here

                1 Reply Last reply
                1
                • DartyD Darty

                  @claws True, but don't forget you'll make less power under 6-8k Rpm.

                  @Calum lol I don't have much to say about these bikes anymore

                  NINJAN Offline
                  NINJAN Offline
                  NINJA
                  wrote on last edited by
                  #26

                  @Darty Which bikes are you currently working on/involved with ATM then dude???

                  SEDUCED BY THE DARK SIDE!!!

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                  0
                  • CalumC Calum

                    @Darty Join the club. But most of us talk about different projects these days.

                    clawsC Offline
                    clawsC Offline
                    claws
                    wrote on last edited by
                    #27

                    @Calum okay so the carb made the dt much better. didnt even have to tune it lol

                    2̶0̶0̶4̶ ̶D̶T̶1̶2̶5̶R̶E̶ ̶w̶i̶t̶h̶ ̶s̶u̶p̶e̶r̶m̶o̶t̶o̶ ̶w̶h̶e̶e̶l̶s̶ ̶a̶n̶d̶ ̶a̶ ̶1̶7̶0̶c̶c̶ ̶a̶t̶h̶e̶n̶a̶ ̶k̶i̶t̶
                    1999 YZ250 with a 1999 DTR VIN

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                    0
                    • clawsC Offline
                      clawsC Offline
                      claws
                      wrote on last edited by
                      #28

                      and i flipped the bike while doing a wheelie today. bent my front forks and got the rear plastic banged up. getting new ones tomorrow though

                      2̶0̶0̶4̶ ̶D̶T̶1̶2̶5̶R̶E̶ ̶w̶i̶t̶h̶ ̶s̶u̶p̶e̶r̶m̶o̶t̶o̶ ̶w̶h̶e̶e̶l̶s̶ ̶a̶n̶d̶ ̶a̶ ̶1̶7̶0̶c̶c̶ ̶a̶t̶h̶e̶n̶a̶ ̶k̶i̶t̶
                      1999 YZ250 with a 1999 DTR VIN

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