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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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  • clawsC Offline
    clawsC Offline
    claws
    wrote on last edited by
    #1

    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
    0
    • CalumC Offline
      CalumC Offline
      Calum
      wrote on last edited by
      #2

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

      Always Originate, Never Pirate!

      clawsC 1 Reply Last reply
      0
      • CalumC Calum

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

        clawsC Offline
        clawsC Offline
        claws
        wrote on last edited by
        #3

        @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
        0
        • CalumC Offline
          CalumC Offline
          Calum
          wrote on last edited by
          #4

          36 is HUGE!

          that will be horrendous on fuel!

          Always Originate, Never Pirate!

          clawsC 1 Reply Last reply
          0
          • CalumC Calum

            36 is HUGE!

            that will be horrendous on fuel!

            clawsC Offline
            clawsC Offline
            claws
            wrote on last edited by
            #5

            @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

            CalumC 1 Reply Last reply
            0
            • clawsC claws

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

              CalumC Offline
              CalumC Offline
              Calum
              wrote on last edited by
              #6

              @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!

              clawsC 1 Reply Last reply
              0
              • CalumC Calum

                @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.

                clawsC Offline
                clawsC Offline
                claws
                wrote on last edited by
                #7

                @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

                CalumC 1 Reply Last reply
                0
                • clawsC claws

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

                  CalumC Offline
                  CalumC Offline
                  Calum
                  wrote on last edited by
                  #8

                  @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!

                  clawsC 1 Reply Last reply
                  1
                  • CalumC Calum

                    @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.

                    clawsC Offline
                    clawsC Offline
                    claws
                    wrote on last edited by
                    #9

                    @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

                    CalumC 1 Reply Last reply
                    0
                    • clawsC claws

                      @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

                      CalumC Offline
                      CalumC Offline
                      Calum
                      wrote on last edited by
                      #10

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

                      Always Originate, Never Pirate!

                      O clawsC 2 Replies Last reply
                      1
                      • CalumC Calum

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

                        O Offline
                        O Offline
                        oldman
                        wrote on last edited by
                        #11

                        @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

                        1 Reply Last reply
                        0
                        • CalumC Calum

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

                          clawsC Offline
                          clawsC Offline
                          claws
                          wrote on last edited by
                          #12

                          @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

                          CalumC 1 Reply Last reply
                          1
                          • clawsC claws

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

                            CalumC Offline
                            CalumC Offline
                            Calum
                            wrote on last edited by Calum
                            #13

                            @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!

                            clawsC 1 Reply Last reply
                            0
                            • CalumC 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!

                              clawsC Offline
                              clawsC Offline
                              claws
                              wrote on last edited by
                              #14

                              @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

                              DartyD 1 Reply Last reply
                              0
                              • clawsC claws

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

                                DartyD Offline
                                DartyD Offline
                                Darty
                                wrote on last edited by
                                #15

                                @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

                                CalumC clawsC 2 Replies Last reply
                                3
                                • DartyD Darty

                                  @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.

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

                                  @Darty Long time no post 😛

                                  Always Originate, Never Pirate!

                                  1 Reply Last reply
                                  0
                                  • DartyD Darty

                                    @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.

                                    clawsC Offline
                                    clawsC Offline
                                    claws
                                    wrote on last edited by
                                    #17

                                    @Darty cant be slower than now though

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

                                    CalumC DartyD 2 Replies Last reply
                                    0
                                    • clawsC claws

                                      @Darty cant be slower than now though

                                      CalumC Offline
                                      CalumC Offline
                                      Calum
                                      wrote on last edited by
                                      #18

                                      @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!

                                      clawsC 1 Reply Last reply
                                      1
                                      • 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

                                        1 Reply Last reply
                                        0
                                        • 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
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