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DT125R FORUM

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  2. General Discussion
  3. How quick should a dt be?

How quick should a dt be?

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  • D DevonDtr

    Not interested in top end really, it tops 80 on a good non windy day: )

    Biker_123B Offline
    Biker_123B Offline
    Biker_123
    wrote on last edited by
    #6

    @DevonDtr That's actually decent then if it's still restricted haha 👍🏻. Has your friends bike got any mods done to it as I'd imagine your bike should still be quicker than a 125 4/

    Every problem has a solution

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    • D Offline
      D Offline
      DevonDtr
      wrote on last edited by
      #7

      Nope, it's brand new and he weighs 15 stone. I only weigh 12 and mines marginally quicker

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      • Biker_123B Offline
        Biker_123B Offline
        Biker_123
        wrote on last edited by
        #8

        Hmm weird! I know a few people with 125 4/ bikes and they can't get close to my bike although one friend has a Yamaha wr125 supermoto that's been fitted with a big bore kit and some other mods and that will keep up with my DT but accelation wise my bike destroys it lol must be because my bikes older 1997 it's full power it will happily sit behind my cousins YZ 125 and acceleration wise it isn't far behind it

        Every problem has a solution

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        • CalumC Offline
          CalumC Offline
          Calum
          wrote on last edited by
          #9

          It should piss all over the yzf r125.

          You're confusing.

          You say its got a dep and a big one full system.

          Which is it. You can't have both.

          You either have a big one full system.

          Or a dep.

          Or do you mean you have a big one expansion chamber and a dep end can.

          Even as stock the dt should destroy the r125. I remember kids around me having one back in the day. Unless they got a whole lot faster!

          The DT isn't a pocket rocket though. They are just an all round good two stroke. Get something like an rs that will make 250 four strokes look silly.

          Always Originate, Never Pirate!

          1 Reply Last reply
          1
          • D Offline
            D Offline
            DevonDtr
            wrote on last edited by
            #10

            So it's a big one expansion and tail pipe, just had dep sticker (my bad)

            CalumC 1 Reply Last reply
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            • D DevonDtr

              So it's a big one expansion and tail pipe, just had dep sticker (my bad)

              CalumC Offline
              CalumC Offline
              Calum
              wrote on last edited by
              #11

              @DevonDtr Fair enough.

              Yeah these bikes are easy enough to derestrict. But mine was restricted and it was far superior than a YZF R125. But I hear really bad things about the Big One Pipe!

              Always Originate, Never Pirate!

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              • D Offline
                D Offline
                DevonDtr
                wrote on last edited by
                #12

                Yeah I wanted an fmf full system but they are Mega bucks. Next month she in again for another batch of goodies so hopefully I will see better performance

                CalumC 1 Reply Last reply
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                • D DevonDtr

                  Yeah I wanted an fmf full system but they are Mega bucks. Next month she in again for another batch of goodies so hopefully I will see better performance

                  CalumC Offline
                  CalumC Offline
                  Calum
                  wrote on last edited by
                  #13

                  @DevonDtr didn't realise fmf did a system.

                  I have done them all.mate. Best bang for buck is to get yourself a Zeeltronic ignition system mate. So much more power.

                  Always Originate, Never Pirate!

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                  • D Offline
                    D Offline
                    DevonDtr
                    wrote on last edited by
                    #14

                    Apparently they do, or so I got told by local mx shop 😀

                    Biker_123B 1 Reply Last reply
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                    • D DevonDtr

                      Apparently they do, or so I got told by local mx shop 😀

                      Biker_123B Offline
                      Biker_123B Offline
                      Biker_123
                      wrote on last edited by
                      #15

                      @DevonDtr I've been looking into exhaust systems for a DTR SM project I'm currently building up at the moment but it seems the FMF system isn't official from what I've been reading. A ktm 125 FMF system can be made to fit the dt's with some modification there's a few videos on YouTube with dt's using them.

                      Every problem has a solution

                      CalumC 1 Reply Last reply
                      0
                      • Biker_123B Biker_123

                        @DevonDtr I've been looking into exhaust systems for a DTR SM project I'm currently building up at the moment but it seems the FMF system isn't official from what I've been reading. A ktm 125 FMF system can be made to fit the dt's with some modification there's a few videos on YouTube with dt's using them.

                        CalumC Offline
                        CalumC Offline
                        Calum
                        wrote on last edited by
                        #16

                        @Biker_123 makes sense. KTM did a model with dtr engine in. So would make sense a pipe exists for it.

                        Always Originate, Never Pirate!

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                        2
                        • D Offline
                          D Offline
                          DevonDtr
                          wrote on last edited by
                          #17

                          This zeeltronic system, I found the site but can't find a price, are they expensive?

                          DartyD CalumC 2 Replies Last reply
                          0
                          • D DevonDtr

                            This zeeltronic system, I found the site but can't find a price, are they expensive?

                            DartyD Offline
                            DartyD Offline
                            Darty
                            wrote on last edited by
                            #18

                            @DevonDtr Last time I enquired about just the unit alone it was £220. You do kind of need the handheld programmer, they are really helpful. They were £60 :L

                            Keep it real

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                            0
                            • D DevonDtr

                              This zeeltronic system, I found the site but can't find a price, are they expensive?

                              CalumC Offline
                              CalumC Offline
                              Calum
                              wrote on last edited by
                              #19

                              @DevonDtr i went directly to Yamaha and got mine for 160. But he bought mine in bulk.

                              Could give them a bell and ask Yamaha Skellerns a ring and ask.

                              Always Originate, Never Pirate!

                              1 Reply Last reply
                              0
                              • D Offline
                                D Offline
                                DevonDtr
                                wrote on last edited by
                                #20

                                I got a yam dealer close so I will pop in and ask 🙂 is it a massive differenc for the price?

                                CalumC 1 Reply Last reply
                                0
                                • D DevonDtr

                                  I got a yam dealer close so I will pop in and ask 🙂 is it a massive differenc for the price?

                                  CalumC Offline
                                  CalumC Offline
                                  Calum
                                  wrote on last edited by
                                  #21

                                  @DevonDtr

                                  As I keep saying.

                                  In my experience it is THE BEST bang for buck.

                                  The power is increased throughout the rev range. The torques are massively noticeable. The peak power not so much.

                                  Bare this is mind, any thing else you do to the engine will be multiplied when you run an aftermarket ECU.

                                  I have had barrels ported, exhausts, Carbs, different rare "super teen" engine, and the one thing that stood above the rest was the CDI

                                  Always Originate, Never Pirate!

                                  Yamboy46Y 1 Reply Last reply
                                  1
                                  • CalumC Calum

                                    @DevonDtr

                                    As I keep saying.

                                    In my experience it is THE BEST bang for buck.

                                    The power is increased throughout the rev range. The torques are massively noticeable. The peak power not so much.

                                    Bare this is mind, any thing else you do to the engine will be multiplied when you run an aftermarket ECU.

                                    I have had barrels ported, exhausts, Carbs, different rare "super teen" engine, and the one thing that stood above the rest was the CDI

                                    Yamboy46Y Offline
                                    Yamboy46Y Offline
                                    Yamboy46
                                    wrote on last edited by
                                    #22

                                    @calum what's a super teen engine calum?

                                    CalumC 1 Reply Last reply
                                    0
                                    • Yamboy46Y Yamboy46

                                      @calum what's a super teen engine calum?

                                      CalumC Offline
                                      CalumC Offline
                                      Calum
                                      wrote on last edited by Calum
                                      #23

                                      @tdrgreg2 Super teen was a racing series for teenagers to enter. Due to their age and experience, the series was designed to race 125 two strokes.

                                      Teens would predominately race Aprilia RS125's, Honda RS125's and the Occassional Yamaha TZR 125 RR

                                      alt text

                                      The engine in that bike is a direct fit into the Yamaha DT125R.

                                      I fitted that into my DT.

                                      Always Originate, Never Pirate!

                                      N 1 Reply Last reply
                                      1
                                      • Yamboy46Y Offline
                                        Yamboy46Y Offline
                                        Yamboy46
                                        wrote on last edited by
                                        #24

                                        Thank-you buddy! Sounds very interesting. Are you currently running the engine on the Leviathan build?

                                        CalumC 1 Reply Last reply
                                        0
                                        • Yamboy46Y Yamboy46

                                          Thank-you buddy! Sounds very interesting. Are you currently running the engine on the Leviathan build?

                                          CalumC Offline
                                          CalumC Offline
                                          Calum
                                          wrote on last edited by
                                          #25

                                          @tdrgreg2 No it was worse than the RE engine lol.

                                          It's all in that build thread.

                                          It's a very special engine, it was an engine cast using motori minerelli stamps, indicating that it was a genuine Italian built engine.

                                          But the casting is week, the cylinder is, well poor and it is in fact the SP you really want. Good luck getting one, it would be easier and cheaper to run another 125 super teen engine in the DT frame, like oh I don't know the Rotax 122 engine which can be had cheap and tuned better!

                                          alt text

                                          alt text

                                          Can't find an example of the porting. but it's insane.

                                          Until you look at the rotax engine, which again was mass produced, then you realise you're paying a lot of money for not much really.

                                          Always Originate, Never Pirate!

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