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DT125R FORUM

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  4. ATHENA 170cc

ATHENA 170cc

Scheduled Pinned Locked Moved Engine
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  • CalumC Offline
    CalumC Offline
    Calum
    wrote on last edited by
    #2

    Quality is lovely to be fair and when setup properly they go well.

    There is a huge loss of over-rev, but the midrange is brilliant. Dies off around 10,000RPM.

    Couple this with a pipe and a proper ignition system then you're in for a real treat.

    The bore is nikasil plated and the head is independent from the skull cap. So overall it's nice quality.

    I had mine ported by Mick Abbey as well.

    Always Originate, Never Pirate!

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    • StanKnS Online
      StanKnS Online
      StanKn
      wrote on last edited by
      #3

      Sounds excellent, not a huge fan of revving of 10,000 anyways I love the sound of some midrange power, I've currently got a DEP silencer and de-restricted pipe, How would you go about upgrading the Ignition system?

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

        I highly recommend the Zeeltronic ignition systems. I own 4 of them. That was the single biggest improvement on my Yamaha IMO.

        Yeah, I've grown to like the Athena I must admit. If you go back 10 years, you'll find posts of me not loving it so much. The reason is, my friends all had Aprilia RS125s and they just run rings around the DTRs. The fact is, I wanted something like a YZ or Aprilia in terms of performance.

        I've now grown to realise that the DTR was never going to be on par with those bikes, no matter how much I spend. So now it's just about appreciating the DTR for what it is. The Athena is more akin to my type of riding, when I'm on my DTR.

        When I'm on my RS, it's all about revving the nuts off of it 😛

        Always Originate, Never Pirate!

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        • StanKnS Online
          StanKnS Online
          StanKn
          wrote on last edited by
          #5

          Seriously thanks for all the help, I swear any question asked you've answered. You know everything about DTs, absolute wizard,

          CalumC 1 Reply Last reply
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          • StanKnS StanKn

            Seriously thanks for all the help, I swear any question asked you've answered. You know everything about DTs, absolute wizard,

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

            @StanKn I'm not sure about that, I've just been around DTRs for a long time. Probably done every modification under the sun and back again. So I know a little more than average about them. True masters are people like @oldman @scrimsmustang @HOTSHOT-III to name a few.

            Always Originate, Never Pirate!

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            • MadGyverM Offline
              MadGyverM Offline
              MadGyver
              wrote on last edited by
              #7

              Yes it worth's the money ported or stock will give you mid range and the ability to cruise at nice speeds around 5K rpm depending the gearing,if you go the tuning way depending the depth of tuning,you can still have mid range like above but scream at about 13K rpm.
              Zeeltronic is excellent as @Calum said.
              You can "play" nice with Yamaha's CDI from other models if you want or some unrestricted.
              @Calum has done extensive mods the other members mentioned from him have their respected history also,I will add @SpookDog and @Louis-DT-WR.

              I need my tools and a pile of junk.....

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              • StanKnS Online
                StanKnS Online
                StanKn
                wrote on last edited by
                #8

                Cheers Guys the help is massively appreciated, My Dads is very experienced with composite work so I plan on making mine a one of kind front fairing, and having the engine about as perfect as it can be, I'm glad a joined this forum seems to have all the answers!!

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                • StanKnS Online
                  StanKnS Online
                  StanKn
                  wrote on last edited by
                  #9

                  Oh meant to ask this too, do I need to do many changes to the jetting if I get the 170cc kit or do the stock jets work fine?
                  Thanks again

                  S 1 Reply Last reply
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                  • CalumC Offline
                    CalumC Offline
                    Calum
                    wrote on last edited by
                    #10

                    You'll want to adjust the jetting to suit.

                    To get the most out of the Athena you'll want a bigger carburettor. I run the VHSA out of the TZR 4DL Belgarda.

                    Always Originate, Never Pirate!

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                    • StanKnS StanKn

                      Oh meant to ask this too, do I need to do many changes to the jetting if I get the 170cc kit or do the stock jets work fine?
                      Thanks again

                      S Offline
                      S Offline
                      SpookDog
                      wrote on last edited by SpookDog
                      #11

                      @StanKn

                      Stock work fine with me.

                      I got a nice improvement in mid and (especially) low rev range torque. I never get tired of cruising along at just over 5K~RPM doing 60mph nice and lazily…

                      I’m sure a bigger carb would be a boon, but myself I hardly ever go over half~3/4 throttle, so it’d be wasted on me 😜
                      I kinda think if you love WOT revving the nuts off of it, it’d be better sticking with the 3MB barrel…

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                      • CalumC Offline
                        CalumC Offline
                        Calum
                        wrote on last edited by
                        #12

                        My mate used to ride his Athena everywhere pinned.

                        https://www.youtube.com/shorts/bOGAEzTaBgI

                        Was very reliable.

                        Always Originate, Never Pirate!

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                        • StanKnS Online
                          StanKnS Online
                          StanKn
                          wrote on last edited by
                          #13

                          Thanks for all the info sounds absolutely perfect for me, I'll definitely buy!

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