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DT125R FORUM

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  4. Athena 170

Athena 170

Scheduled Pinned Locked Moved Top End
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  • Irongamer727I Offline
    Irongamer727I Offline
    Irongamer727
    wrote on last edited by
    #65

    What do you think? I've now fitted a 310 main jet and she's still a bit down on power. It felt better than the 290 for sure. Now I'm thinking about buying a couple of extra jets, 320-350.
    Is this even possible? I've not spoken to anyone running higher than 280.

    1 Reply Last reply
    0
    • 2 Offline
      2 Offline
      2stroketerry
      wrote on last edited by
      #66

      If using a TM28 carb then need a 300 main jet with a 27.5 idle jet. Main jets go up to 430. Put clip in the bottom groove on needle.
      https://www.sip-scootershop.com/en/products/main+jet+mikuni+300+_40703000

      https://www.sip-scootershop.com/en/products/idle+jet+mikuni+275+_40726000

      Irongamer727I 1 Reply Last reply
      0
      • 2 2stroketerry

        If using a TM28 carb then need a 300 main jet with a 27.5 idle jet. Main jets go up to 430. Put clip in the bottom groove on needle.
        https://www.sip-scootershop.com/en/products/main+jet+mikuni+300+_40703000

        https://www.sip-scootershop.com/en/products/idle+jet+mikuni+275+_40726000

        Irongamer727I Offline
        Irongamer727I Offline
        Irongamer727
        wrote on last edited by
        #67

        @2stroketerry I'm running 310 now and it's certainly not optimal. Idle is 35 now, definitely too big.

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        • Irongamer727I Offline
          Irongamer727I Offline
          Irongamer727
          wrote on last edited by
          #68

          In reality, what would cause the bike not to start on the first or second spin on the starter. Is it just down to the pilot jet and fuel/Air mix?
          Obviously a good battery and fresh electric components will make things easier but I got that covered.

          I've read in the Haynes that there is supposed to be a starter jet in the later carbs? Much of what that books says makes no sense...

          1 Reply Last reply
          0
          • Louis-DT-WRL Offline
            Louis-DT-WRL Offline
            Louis-DT-WR
            wrote on last edited by
            #69

            I run the autolube on my dt125r bottom end with wr200 top end. I just adjusted it to suit the larger capacity. I've run it for years. Autolube is brilliant

            Irongamer727I 1 Reply Last reply
            2
            • Louis-DT-WRL Louis-DT-WR

              I run the autolube on my dt125r bottom end with wr200 top end. I just adjusted it to suit the larger capacity. I've run it for years. Autolube is brilliant

              Irongamer727I Offline
              Irongamer727I Offline
              Irongamer727
              wrote on last edited by Irongamer727
              #70

              @louis-james hows that thing to start?

              1 Reply Last reply
              0
              • Louis-DT-WRL Offline
                Louis-DT-WRL Offline
                Louis-DT-WR
                wrote on last edited by
                #71

                First kick 99% of the time

                Irongamer727I 1 Reply Last reply
                0
                • Louis-DT-WRL Louis-DT-WR

                  First kick 99% of the time

                  Irongamer727I Offline
                  Irongamer727I Offline
                  Irongamer727
                  wrote on last edited by
                  #72

                  @louis-james you run the 28mm carb? The flat one?

                  1 Reply Last reply
                  0
                  • Louis-DT-WRL Offline
                    Louis-DT-WRL Offline
                    Louis-DT-WR
                    wrote on last edited by
                    #73

                    I used to, I had the tmx30 for a while, now a tm34ss

                    Irongamer727I 1 Reply Last reply
                    0
                    • Louis-DT-WRL Louis-DT-WR

                      I used to, I had the tmx30 for a while, now a tm34ss

                      Irongamer727I Offline
                      Irongamer727I Offline
                      Irongamer727
                      wrote on last edited by
                      #74

                      @louis-james you ran the 28 with the wr200?

                      1 Reply Last reply
                      0
                      • Louis-DT-WRL Offline
                        Louis-DT-WRL Offline
                        Louis-DT-WR
                        wrote on last edited by
                        #75

                        No, I had the 30 when it was still a 125. Lid was cut off the air box the the 28mm btw

                        Irongamer727I 1 Reply Last reply
                        0
                        • Louis-DT-WRL Louis-DT-WR

                          No, I had the 30 when it was still a 125. Lid was cut off the air box the the 28mm btw

                          Irongamer727I Offline
                          Irongamer727I Offline
                          Irongamer727
                          wrote on last edited by
                          #76

                          @louis-james alright

                          Louis-DT-WRL 1 Reply Last reply
                          0
                          • Irongamer727I Irongamer727

                            @louis-james alright

                            Louis-DT-WRL Offline
                            Louis-DT-WRL Offline
                            Louis-DT-WR
                            wrote on last edited by
                            #77

                            @irongamer727 recommend getting a decent reed block on there. Many can be modified to fit

                            Irongamer727I 1 Reply Last reply
                            0
                            • Louis-DT-WRL Louis-DT-WR

                              @irongamer727 recommend getting a decent reed block on there. Many can be modified to fit

                              Irongamer727I Offline
                              Irongamer727I Offline
                              Irongamer727
                              wrote on last edited by
                              #78

                              @louis-james naah at the moment I simply want her to run good, start easy and stay that way.

                              1 Reply Last reply
                              0
                              • Irongamer727I Offline
                                Irongamer727I Offline
                                Irongamer727
                                wrote on last edited by Irongamer727
                                #79

                                As I suspected my pilot jet to be too big (size 35) I ordered a smaller 25. But the bike literally ran like shit and the idle was very uncontrolled and the bike just sounded wrong!

                                Is the next step to order a larger?
                                I can without a drop in rpm turn the airscrew all the way in, no change really.

                                That must be an indicator that it's to small right?

                                1 Reply Last reply
                                0
                                • J Offline
                                  J Offline
                                  Jens Eskildsen
                                  wrote on last edited by
                                  #80

                                  Yeb sounds like you need to up the idlejet in size.

                                  1 Reply Last reply
                                  0
                                  • Irongamer727I Offline
                                    Irongamer727I Offline
                                    Irongamer727
                                    wrote on last edited by
                                    #81

                                    @Calum agree?

                                    1 Reply Last reply
                                    0
                                    • Glynn123G Offline
                                      Glynn123G Offline
                                      Glynn123
                                      wrote on last edited by
                                      #82

                                      Id go a fair bit bigger idle jet than a 25, im running a 27.5 pilot on 125 bore with snorkel removed here in sunny scotland, id imagine the 170 kit would require a fair bit bigger pilot especially in your climate, maybe a 30?

                                      Irongamer727I 1 Reply Last reply
                                      0
                                      • Glynn123G Glynn123

                                        Id go a fair bit bigger idle jet than a 25, im running a 27.5 pilot on 125 bore with snorkel removed here in sunny scotland, id imagine the 170 kit would require a fair bit bigger pilot especially in your climate, maybe a 30?

                                        Irongamer727I Offline
                                        Irongamer727I Offline
                                        Irongamer727
                                        wrote on last edited by
                                        #83

                                        @glynn123 I'm running 35 now.

                                        1 Reply Last reply
                                        0
                                        • Irongamer727I Offline
                                          Irongamer727I Offline
                                          Irongamer727
                                          wrote on last edited by
                                          #84

                                          I'm now contacting Adrenalin (the company I bought the kit from) and I'm asking for a refund.

                                          The issue is that the casting is shite, there is a microscopic hole on the cylinder that leaks coolant, and that the powervalve housing is too big so the bush cannot seal properly.

                                          Exhaust gases and oil pours out if the pv, bruh.
                                          I have more or less demanded a refund, but I don't think they will give me that until Athena in Italy have examined it..

                                          In theory I won't have the Dt running for over a month, unless I immediately mount another cylinder I had from a spare engine..

                                          That means all my jets have been bought in vain and all that, great.

                                          The lesson here is: Do not buy the stupid Athena big bore kit. Even if you don't get a really bad one the power gains are barely notable.
                                          To really benefit from it a lot more have to be done.

                                          Sometimes life isn't easy..

                                          CalumC D 2 Replies Last reply
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