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DT125R FORUM

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Scheduled Pinned Locked Moved Engine
31 Posts 7 Posters 2.7k Views
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  • 2 Offline
    2 Offline
    2stroketerry
    wrote on last edited by
    #22

    Hi @Bluestoesonnose £85 posted ?

    declanD 1 Reply Last reply
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    • 2 2stroketerry

      Hi @Bluestoesonnose £85 posted ?

      declanD Offline
      declanD Offline
      declan
      wrote on last edited by
      #23

      @2stroketerry 85s a good price

      1 Reply Last reply
      0
      • BluestoesonnoseB Bluestoesonnose

        Hi,
        Looks good to me, no idea what the going rate is for one, ummm £75 posted?

        BluestoesonnoseB Offline
        BluestoesonnoseB Offline
        Bluestoesonnose
        wrote on last edited by
        #24

        Hi, sorry to say I got offered one for £50 all in so I've bought that.

        Thanks anyways

        2002 DT125R

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        • 2 2stroketerry

          To get DT to pull a lot harder should of fitted Athena 170 kit rather than a ported 125 barrel, have got a ported head and barrel off Mick and the 170 is miles better with the extra torque and being 20 stone the torque makes so much difference. My 170 is fully ported and revs to over 11,000 on a 2003 DT R using standard TM 28 carb with the powerjet blocked and standard air filter with snorkel on.
          People who say ports are 3mm to low don't know anything about tuning as when mapped the ports and they are 125 ports and same hieght as 125 ports. The reason they don't rev past around 8,000 or so is because of the exhaust port width as on 2 strokes exhaust port width has to be a certain percent of the bore diameter, so going from 56mm bore to 65mm bore totaly screws up the engine. Exhaust port width limit is 73% of the bore diameter (measured straight across). So 56mm bore is 41mm and the 65mm bore can be opened up to 47mm.
          Double check the pv cable setting on Athena kit as with holes lined up standard the powervalve is only 3/4 open, on mine set powervalve in cylinder flush then drilled a new 4mm hole in center of powervalve pully.
          Engine tuning is all about everything working together and a combination of ports, compression, carb, ignition all perfectly matched. With the Athena kit most people run wrong plugs to suit it best like br9es or a br9eix irridium plug. The plugs to use on any ported DT are NGK B10EG non resister plugs along with 7mm HT lead copper core and a non resister plug cap.
          The bottom end makes cruising more relaxed, and the extra top end means it'll now do a wheelie in 4th gear easy.

          S Offline
          S Offline
          sprintall84
          wrote on last edited by
          #25

          @2stroketerry what’s top speed you had out of your dt with the 170 kit on ?? Coz A few people saying there no good get a 4fu00 barrel and head ??

          CalumC 1 Reply Last reply
          0
          • S sprintall84

            @2stroketerry what’s top speed you had out of your dt with the 170 kit on ?? Coz A few people saying there no good get a 4fu00 barrel and head ??

            CalumC Offline
            CalumC Offline
            Calum
            wrote on last edited by
            #26

            @sprintall84 It's not necessary speed you benefit from, but more torque. So gear it appropriately you should be fine.

            As a general whole, the Athena kit isn't brilliant. A 3MB00SP Barrel is what you want. But the price for those is astronomical.

            4FU is a decent barrel which is plated rather than steel liner. This benefits from better heat transfer. But draws back from expensive repairs. Ultimately the DT is limited.

            A decent spec'd Athena 170 should top out at 100mph. Plenty for a 125.

            Always Originate, Never Pirate!

            S 1 Reply Last reply
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            • T Offline
              T Offline
              theportingmaster
              wrote on last edited by
              #27

              Here is my ported 170 athena when first fitted it using standard gearing and went off the clock. Fitted an Athena exhaust and a 34mm polini carb with top of air box cut out to it after this video, did 110mph with an 18t front sprocket but really scary on nobbly tyres,lol😵
              https://www.youtube.com/watch?v=8a_sBkpuQ14

              S 2 Replies Last reply
              0
              • T theportingmaster

                Here is my ported 170 athena when first fitted it using standard gearing and went off the clock. Fitted an Athena exhaust and a 34mm polini carb with top of air box cut out to it after this video, did 110mph with an 18t front sprocket but really scary on nobbly tyres,lol😵
                https://www.youtube.com/watch?v=8a_sBkpuQ14

                S Offline
                S Offline
                sprintall84
                wrote on last edited by
                #28

                @theportingmaster is that your dt in the YouTube clip ??

                1 Reply Last reply
                0
                • J Offline
                  J Offline
                  jonne123
                  wrote on last edited by
                  #29

                  That 110 is really fast closer to over 30hp

                  1 Reply Last reply
                  0
                  • CalumC Calum

                    @sprintall84 It's not necessary speed you benefit from, but more torque. So gear it appropriately you should be fine.

                    As a general whole, the Athena kit isn't brilliant. A 3MB00SP Barrel is what you want. But the price for those is astronomical.

                    4FU is a decent barrel which is plated rather than steel liner. This benefits from better heat transfer. But draws back from expensive repairs. Ultimately the DT is limited.

                    A decent spec'd Athena 170 should top out at 100mph. Plenty for a 125.

                    S Offline
                    S Offline
                    sprintall84
                    wrote on last edited by
                    #30
                    This post is deleted!
                    1 Reply Last reply
                    0
                    • T theportingmaster

                      Here is my ported 170 athena when first fitted it using standard gearing and went off the clock. Fitted an Athena exhaust and a 34mm polini carb with top of air box cut out to it after this video, did 110mph with an 18t front sprocket but really scary on nobbly tyres,lol😵
                      https://www.youtube.com/watch?v=8a_sBkpuQ14

                      S Offline
                      S Offline
                      sprintall84
                      wrote on last edited by
                      #31

                      @theportingmaster you got any 170 barrel and head for sale ??

                      1 Reply Last reply
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