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DT125R FORUM

  1. Home
  2. Tuning
  3. Top End
  4. Athena 170

Athena 170

Scheduled Pinned Locked Moved Top End
112 Posts 14 Posters 31.8k Views
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  • Irongamer727I Offline
    Irongamer727I Offline
    Irongamer727
    wrote on last edited by
    #48

    What do you think? The DT is refusing to start cold. Always have to bumpstart it. Choke or not. Once warm everything is more than good.

    CalumC 1 Reply Last reply
    0
    • Irongamer727I Irongamer727

      What do you think? The DT is refusing to start cold. Always have to bumpstart it. Choke or not. Once warm everything is more than good.

      CalumC Online
      CalumC Online
      Calum
      wrote on last edited by
      #49

      @irongamer727 You running the stoke carb?

      I always had issues with the stock carb.

      What plug you running.

      Always Originate, Never Pirate!

      Irongamer727I 1 Reply Last reply
      0
      • CalumC Calum

        @irongamer727 You running the stoke carb?

        I always had issues with the stock carb.

        What plug you running.

        Irongamer727I Offline
        Irongamer727I Offline
        Irongamer727
        wrote on last edited by
        #50

        @calum br9eix 90km from brand new. Will try to fiddle with the air screw.

        CalumC 1 Reply Last reply
        0
        • Irongamer727I Irongamer727

          @calum br9eix 90km from brand new. Will try to fiddle with the air screw.

          CalumC Online
          CalumC Online
          Calum
          wrote on last edited by
          #51

          @irongamer727 Before you mess with the settings, try stifling the airbox, restrict the air box, see if that makes it better or worse. Or take the snorkel out. That'll give you a hint as to what the problem is.

          Always Originate, Never Pirate!

          Irongamer727I 1 Reply Last reply
          0
          • CalumC Calum

            @irongamer727 Before you mess with the settings, try stifling the airbox, restrict the air box, see if that makes it better or worse. Or take the snorkel out. That'll give you a hint as to what the problem is.

            Irongamer727I Offline
            Irongamer727I Offline
            Irongamer727
            wrote on last edited by
            #52

            @calum the entire snorkel and the top plastic is cut out. I'll comment on the post I did a while back and you'll see

            1 Reply Last reply
            0
            • CalumC Online
              CalumC Online
              Calum
              wrote on last edited by
              #53

              Ah yeah, so with that then, it probably just wants a tad more fuel to compensate.

              Always Originate, Never Pirate!

              Irongamer727I 1 Reply Last reply
              0
              • CalumC Calum

                Ah yeah, so with that then, it probably just wants a tad more fuel to compensate.

                Irongamer727I Offline
                Irongamer727I Offline
                Irongamer727
                wrote on last edited by
                #54

                @calum I guess I could order a bigger idle jet or wait for the summer...

                CalumC 1 Reply Last reply
                0
                • Irongamer727I Irongamer727

                  @calum I guess I could order a bigger idle jet or wait for the summer...

                  CalumC Online
                  CalumC Online
                  Calum
                  wrote on last edited by Calum
                  #55

                  @irongamer727 Either way it doesn't sound right.

                  If it were fueling, it would start if you opened the throttle ajar.

                  Always Originate, Never Pirate!

                  Irongamer727I 1 Reply Last reply
                  0
                  • CalumC Calum

                    @irongamer727 Either way it doesn't sound right.

                    If it were fueling, it would start if you opened the throttle ajar.

                    Irongamer727I Offline
                    Irongamer727I Offline
                    Irongamer727
                    wrote on last edited by Irongamer727
                    #56

                    @calum recommendations then?
                    It has never ever wanted to start with throttle. With or without the big bore. With the previous cylinder it would at least start fast cold.

                    CalumC 1 Reply Last reply
                    0
                    • Irongamer727I Irongamer727

                      @calum recommendations then?
                      It has never ever wanted to start with throttle. With or without the big bore. With the previous cylinder it would at least start fast cold.

                      CalumC Online
                      CalumC Online
                      Calum
                      wrote on last edited by
                      #57

                      @irongamer727 Better carb mate.

                      I had issues with my Athena as well. Carb sorted that out.

                      I had issues with the stock cylinder. Carb sorted that out.

                      Always Originate, Never Pirate!

                      Irongamer727I 1 Reply Last reply
                      0
                      • CalumC Calum

                        @irongamer727 Better carb mate.

                        I had issues with my Athena as well. Carb sorted that out.

                        I had issues with the stock cylinder. Carb sorted that out.

                        Irongamer727I Offline
                        Irongamer727I Offline
                        Irongamer727
                        wrote on last edited by
                        #58

                        @calum ehm. No. Won't change that. Problem lies somewhere else.

                        CalumC 1 Reply Last reply
                        0
                        • Irongamer727I Offline
                          Irongamer727I Offline
                          Irongamer727
                          wrote on last edited by
                          #59

                          If I only had a kickstart...

                          1 Reply Last reply
                          0
                          • Irongamer727I Irongamer727

                            @calum ehm. No. Won't change that. Problem lies somewhere else.

                            CalumC Online
                            CalumC Online
                            Calum
                            wrote on last edited by
                            #60

                            @irongamer727 That's what you want mate.

                            alt text

                            https://www.ebay.co.uk/itm/YAMAHA-TZR-125-4DL-yr-92-CARBURETTOR-DELLORTO-VHSA-32-GS/282744266127?hash=item41d4df1d8f:g:GTwAAOSwrhhaFTOk

                            That'll fix your problem guaranteed!

                            I literally don't know why the original carb sucks balls lol.

                            Always Originate, Never Pirate!

                            declanD 1 Reply Last reply
                            0
                            • CalumC Calum

                              @irongamer727 That's what you want mate.

                              alt text

                              https://www.ebay.co.uk/itm/YAMAHA-TZR-125-4DL-yr-92-CARBURETTOR-DELLORTO-VHSA-32-GS/282744266127?hash=item41d4df1d8f:g:GTwAAOSwrhhaFTOk

                              That'll fix your problem guaranteed!

                              I literally don't know why the original carb sucks balls lol.

                              declanD Offline
                              declanD Offline
                              declan
                              wrote on last edited by
                              #61

                              @calum I’d rathet bump start it than pay that price lol

                              CalumC 1 Reply Last reply
                              0
                              • declanD declan

                                @calum I’d rathet bump start it than pay that price lol

                                CalumC Online
                                CalumC Online
                                Calum
                                wrote on last edited by
                                #62

                                @declan Yeah but that's just the cost of tuning for you bud.

                                Always Originate, Never Pirate!

                                declanD 1 Reply Last reply
                                0
                                • CalumC Calum

                                  @declan Yeah but that's just the cost of tuning for you bud.

                                  declanD Offline
                                  declanD Offline
                                  declan
                                  wrote on last edited by
                                  #63

                                  @calum cost of genuine carbs tbh carbs are quite pricey

                                  1 Reply Last reply
                                  0
                                  • Irongamer727I Offline
                                    Irongamer727I Offline
                                    Irongamer727
                                    wrote on last edited by
                                    #64

                                    Things are not going my way. 180km into break in I spotted 2 small holes on the cylinder. I have spoken to the company I bought the kit from and they will contact Athena for assistance. Hopefully this ends well..

                                    https://youtu.be/JSdh4gz1p8w

                                    1 Reply Last reply
                                    0
                                    • 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.

                                          1 Reply Last reply
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