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

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    carburetor
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    • claws
      claws last edited by

      So what carburetors do you recommend to buy for my DT? I am currently running the stock carb but I'm planning on buying a bigger carburetor. I bought the bike with the 170cc cylinder kit and stock carb and it works fine but I think it needs a bigger carb though. Oh yea it's an 04 DT125RE

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

      1 Reply Last reply Reply Quote 0
      • Calum
        Calum last edited by

        I reckon a VHSA would be a good car for that application

        Always Originate, Never Pirate!

        claws 1 Reply Last reply Reply Quote 0
        • claws
          claws @Calum last edited by

          @Calum buying a 36mm keihin pwk. yes its a bit overkill but i got it for cheap. and im also buying a pro circuit 304 silencer as well

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

          1 Reply Last reply Reply Quote 0
          • Calum
            Calum last edited by

            36 is HUGE!

            that will be horrendous on fuel!

            Always Originate, Never Pirate!

            claws 1 Reply Last reply Reply Quote 0
            • claws
              claws @Calum last edited by

              @Calum it is already because my ypvs is locked to the up right position and the carburetor isnt in perfect tune

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

              Calum 1 Reply Last reply Reply Quote 0
              • Calum
                Calum @claws last edited by

                @claws Well you've definitely got more money than me.

                Once upon a time my brother ran a kehien 38 on his 170 Athena. The fueling was mental and the performance did not match.

                That's just my advice, you don't have to take it. Bigger is not always better. You'd do well to lower it to get more performance and fuel economy.

                My brother is currently running a 34mm on a 170cc two stroke, and he's looking at a 28mm for more performance and better economy.

                Always Originate, Never Pirate!

                claws 1 Reply Last reply Reply Quote 0
                • claws
                  claws @Calum last edited by

                  @Calum i cant really tune my current carb and i dont have that much money haha

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

                  Calum 1 Reply Last reply Reply Quote 0
                  • Calum
                    Calum @claws last edited by

                    @claws You're throwing good money after bad, a few jets is considerably cheaper than a 36mm carb. Besides, do you really think slapping on a carb will make your bike run right?

                    Fueling is no something you scrimp on, run it lean, and you'll run into detonation destroying both the bottom and top end. So don't scrimp on fueling.

                    Always Originate, Never Pirate!

                    claws 1 Reply Last reply Reply Quote 1
                    • claws
                      claws @Calum last edited by

                      @Calum getting the keihin for 60 euros isnt a bad deal besides the screws for the carburetor are seized so i cant mess with the float or jets. also i can just sell the carb if i need to. im not an expert at tuning carbs but i can make it run ok

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

                      Calum 1 Reply Last reply Reply Quote 0
                      • Calum
                        Calum @claws last edited by

                        @claws It needs to run spot on, is my point. Even the new carb will need jetting.

                        Always Originate, Never Pirate!

                        O claws 2 Replies Last reply Reply Quote 1
                        • O
                          oldman @Calum last edited by

                          @Calum said in Whats a good carburetor for my DT125 with a 170cc athena cylinder kit?:

                          @claws It needs to run spot on, is my point. Even the new carb will need jetting.

                          I second that

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                          • claws
                            claws @Calum last edited by

                            @Calum gonna get it running great. better than with the original carb

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

                            Calum 1 Reply Last reply Reply Quote 1
                            • Calum
                              Calum @claws last edited by Calum

                              @claws That's great to hear! I know from experience going too big is detrimental. But maybe I didn't spend enough time tweaking it!

                              Always Originate, Never Pirate!

                              claws 1 Reply Last reply Reply Quote 0
                              • claws
                                claws @Calum last edited by

                                @Calum wouldnt be making any sense to not get it running great. gonna send a video of it running later

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

                                Darty 1 Reply Last reply Reply Quote 0
                                • Darty
                                  Darty @claws last edited by

                                  @claws alt text

                                  Not to sound boring, but, Keihin PWK 36mm of a KDX220

                                  Been there done that, mental, makes no sense. Actually slower overall..

                                  A 32mm can be spot on, if you like to 'hoon' constantly, but these engines are fussy to jet on a bigger carb, I don't recommend it.

                                  Keep it real

                                  Calum claws 2 Replies Last reply Reply Quote 3
                                  • Calum
                                    Calum @Darty last edited by

                                    @Darty Long time no post 😛

                                    Always Originate, Never Pirate!

                                    1 Reply Last reply Reply Quote 0
                                    • claws
                                      claws @Darty last edited by

                                      @Darty cant be slower than now though

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

                                      Calum Darty 2 Replies Last reply Reply Quote 0
                                      • Calum
                                        Calum @claws last edited by

                                        @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.

                                        Always Originate, Never Pirate!

                                        claws 1 Reply Last reply Reply Quote 1
                                        • claws
                                          claws @Calum last edited by

                                          @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

                                          1 Reply Last reply Reply Quote 0
                                          • Calum
                                            Calum last edited by

                                            Oh yeah! Report back to us your findings 😃

                                            Always Originate, Never Pirate!

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