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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 Irongamer727
    #87

    What would you do?

    Take a full refund and buy a forged piston to the original Cylinder and mount that or take another Athena cylinder?

    The carb is already set up for the Athena but it's not much work to set it back to stock.

    Could the bike be worth more with the Athena?

    F 1 Reply Last reply
    0
    • Irongamer727I Irongamer727

      What would you do?

      Take a full refund and buy a forged piston to the original Cylinder and mount that or take another Athena cylinder?

      The carb is already set up for the Athena but it's not much work to set it back to stock.

      Could the bike be worth more with the Athena?

      F Offline
      F Offline
      finnerz89
      wrote on last edited by
      #88

      @irongamer727 I don't think so, if it were me in the market for a bike I'd rather buy stock or close to it and do the work myself.

      Other people might feel differently but that's my 2p

      Current bikes:
      DT125X '07
      Street Triple R '11
      Aprilia ETV1000 '02

      Previous:
      DR650RSE '96
      FJ1200 '92

      1 Reply Last reply
      0
      • O Offline
        O Offline
        oldman
        wrote on last edited by
        #89

        Me, I would put back to stock and live with that, at least you know where you are with that. If you get another barrel could be more problems and no guarantee jetting would remain the same.
        But that's me.

        1 Reply Last reply
        0
        • Glynn123G Offline
          Glynn123G Offline
          Glynn123
          wrote on last edited by
          #90

          Would rather a standard bore than a 170 if I'm honest, get it ported and I'm doubting itd be far off the Athena. Or if you're feeling the bigger cc kits splash out for a BARacing 200kit and really feel the power 😍

          Irongamer727I 1 Reply Last reply
          1
          • Glynn123G Glynn123

            Would rather a standard bore than a 170 if I'm honest, get it ported and I'm doubting itd be far off the Athena. Or if you're feeling the bigger cc kits splash out for a BARacing 200kit and really feel the power 😍

            Irongamer727I Offline
            Irongamer727I Offline
            Irongamer727
            wrote on last edited by
            #91

            @glynn123 I'm so done with the big bore kits

            declanD 1 Reply Last reply
            0
            • Irongamer727I Irongamer727

              @glynn123 I'm so done with the big bore kits

              declanD Offline
              declanD Offline
              declan
              wrote on last edited by
              #92

              @irongamer727 I feel your pain bro

              1 Reply Last reply
              0
              • CalumC Offline
                CalumC Offline
                Calum
                wrote on last edited by
                #93

                Get the stock barrel ported and engine the 14k red line.

                Always Originate, Never Pirate!

                Irongamer727I 1 Reply Last reply
                0
                • B Offline
                  B Offline
                  Bananper
                  wrote on last edited by
                  #94

                  Does the 170 kit even give more power? I've heard so much bad about it 😂

                  CalumC 1 Reply Last reply
                  0
                  • B Bananper

                    Does the 170 kit even give more power? I've heard so much bad about it 😂

                    CalumC Offline
                    CalumC Offline
                    Calum
                    wrote on last edited by
                    #95

                    @bananper Not peak, but more power through the midrange. I want to say torque, but I always get thumbed down for saying that.

                    Always Originate, Never Pirate!

                    B 1 Reply Last reply
                    2
                    • CalumC Calum

                      @bananper Not peak, but more power through the midrange. I want to say torque, but I always get thumbed down for saying that.

                      B Offline
                      B Offline
                      Bananper
                      wrote on last edited by
                      #96

                      @calum so basically you lose some peak power in exchange for mid range power? Correct me if I'm wrong 🤓

                      CalumC 1 Reply Last reply
                      0
                      • CalumC Calum

                        Get the stock barrel ported and engine the 14k red line.

                        Irongamer727I Offline
                        Irongamer727I Offline
                        Irongamer727
                        wrote on last edited by
                        #97

                        @calum Ehmm 😬

                        1 Reply Last reply
                        0
                        • B Bananper

                          @calum so basically you lose some peak power in exchange for mid range power? Correct me if I'm wrong 🤓

                          CalumC Offline
                          CalumC Offline
                          Calum
                          wrote on last edited by
                          #98

                          @bananper Without a Dyno Graph it's hard to tell. But due to the port timings being way out, once you start climbing through the revs, the opportunity for the power to be made starts diminishing.

                          Hence why at low RPM's you have the extra CC's to help deliver more low down grunt, but the power tapers off and the gap between a stock barrel and Athena barrel starts to thin out. You definitely lose overrev with the big bore, so the stock barrel will continue to rev out further, allow you to zap out a few extra ponies with the help of porting.

                          Two strokes in general don't love over square engines, the fact that the big bore kit widens the bore whilst maintaining the stroke exacerbates this. A longer stroke is ideal for this kit. There is the potential then, for the longer stroke to correct the port timings, out by 3mm I'm led to believe, to actually correct the issues with the barrel.

                          But by the time you've done all that, you may as well have just thrown a 3XP0 cylinder and crank and be done with it.

                          I haven't the expertise or experience to really comment on how any of this translates. But it's just what I've read from various sites.

                          Always Originate, Never Pirate!

                          B 1 Reply Last reply
                          1
                          • CalumC Calum

                            @bananper Without a Dyno Graph it's hard to tell. But due to the port timings being way out, once you start climbing through the revs, the opportunity for the power to be made starts diminishing.

                            Hence why at low RPM's you have the extra CC's to help deliver more low down grunt, but the power tapers off and the gap between a stock barrel and Athena barrel starts to thin out. You definitely lose overrev with the big bore, so the stock barrel will continue to rev out further, allow you to zap out a few extra ponies with the help of porting.

                            Two strokes in general don't love over square engines, the fact that the big bore kit widens the bore whilst maintaining the stroke exacerbates this. A longer stroke is ideal for this kit. There is the potential then, for the longer stroke to correct the port timings, out by 3mm I'm led to believe, to actually correct the issues with the barrel.

                            But by the time you've done all that, you may as well have just thrown a 3XP0 cylinder and crank and be done with it.

                            I haven't the expertise or experience to really comment on how any of this translates. But it's just what I've read from various sites.

                            B Offline
                            B Offline
                            Bananper
                            wrote on last edited by
                            #99

                            @calum 3XP0 is wr200 engine right?

                            CalumC 1 Reply Last reply
                            0
                            • B Bananper

                              @calum 3XP0 is wr200 engine right?

                              CalumC Offline
                              CalumC Offline
                              Calum
                              wrote on last edited by
                              #100

                              @bananper DT200R I think.

                              Always Originate, Never Pirate!

                              B 1 Reply Last reply
                              0
                              • CalumC Calum

                                @bananper DT200R I think.

                                B Offline
                                B Offline
                                Bananper
                                wrote on last edited by
                                #101

                                @calum is there any difference between wr200 and the dt200?

                                CalumC 1 Reply Last reply
                                0
                                • B Bananper

                                  @calum is there any difference between wr200 and the dt200?

                                  CalumC Offline
                                  CalumC Offline
                                  Calum
                                  wrote on last edited by
                                  #102

                                  @bananper wr is a competition bike.

                                  Always Originate, Never Pirate!

                                  1 Reply Last reply
                                  1
                                  • Louis-DT-WRL Offline
                                    Louis-DT-WRL Offline
                                    Louis-DT-WR
                                    wrote on last edited by
                                    #103

                                    I believe the dt200r is a 3ET barrel. Dt200wr and wr200 share the same 3xp cylinder which is nickasil plated but you can buy steel sleeves for them. I believe the dt200wr is autolube and has a tachometer at generator different dor the electrics

                                    Also the dt230 cylinder and crank is a possibility 🤑 never seen this one done.

                                    1 Reply Last reply
                                    1
                                    • 2 Offline
                                      2 Offline
                                      2stroketerry
                                      wrote on last edited by
                                      #104

                                      Best option is to get your standard 125 barrel re-sleeved to 66mm then fit a Wiseco Forged Yamaha BLASTER YFS 200 Piston Kit 66mm. Piston gudgeon pin and small end bearing same size as dt 125, you will also need your head machining to suit. Kpm or Pjme will re-sleeve the barrel to 66mm and machine the head to match and also works out including forged piston kit and work to barrel and head less than half the price of the Athena kit. Also having a steel liner gives you the option of several rebores. https://www.ebay.com/itm/Wiseco-Yamaha-BLASTER-YFS-200-Piston-Kit-Top-End-Bearing-66mm-Std-Bore-1988-06-/173027889008?fits=Make%3AYamaha

                                      declanD Louis-DT-WRL 2 Replies Last reply
                                      2
                                      • 2 2stroketerry

                                        Best option is to get your standard 125 barrel re-sleeved to 66mm then fit a Wiseco Forged Yamaha BLASTER YFS 200 Piston Kit 66mm. Piston gudgeon pin and small end bearing same size as dt 125, you will also need your head machining to suit. Kpm or Pjme will re-sleeve the barrel to 66mm and machine the head to match and also works out including forged piston kit and work to barrel and head less than half the price of the Athena kit. Also having a steel liner gives you the option of several rebores. https://www.ebay.com/itm/Wiseco-Yamaha-BLASTER-YFS-200-Piston-Kit-Top-End-Bearing-66mm-Std-Bore-1988-06-/173027889008?fits=Make%3AYamaha

                                        declanD Offline
                                        declanD Offline
                                        declan
                                        wrote on last edited by
                                        #105

                                        @2stroketerry very cool I love all the little Frankenstein things you can do to engines

                                        1 Reply Last reply
                                        0
                                        • 2 Offline
                                          2 Offline
                                          2stroketerry
                                          wrote on last edited by
                                          #106

                                          Wossner do a forged piston kit for the dt 125 that is 61mm and the absolute maximum can bore a dt barrel to. Gives around 146cc. https://www.ebay.co.uk/itm/Wossner-Piston-Kit-KTM-LC2-1991-2006-Yamaha-DT125-Over-Bore-61mm/371410153446?hash=item5679c52fe6:g:YI8AAOSwHnFVyn8J
                                          0_1527803968517_mqr4k2wj 160cc.jpg

                                          declanD 1 Reply Last reply
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