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    Yamaha DT 125 DERESTRICTING

    Derestricting
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    • L
      Lukas55 last edited by Lukas55

      Hello! I have Yamaha DT125 1999 and I want to derestrict it. It has 16t front and 57t rear sprocket and top speed is just around 80km/h (50mph) and in 6. gear it revs up only to 6k rpms.
      I have a problem with derestricting. I choose the method with black/green wire that is behind a speedo because I found it easiest, but I can not find any wire that looks like that... There is a mess with those wires and it has anlaser starter so that might be the thing why it is so messy...
      https://i.postimg.cc/D8pRrbCy/1.jpg

      1. wire that is going from speedo has 6 wires on top (not 3), and the same is on the bottom, and it has some wires that are not in that white block but none of them is black/green...

      https://i.postimg.cc/SYyHrLFj/2.jpg
      https://i.postimg.cc/SjyPHG3x/3.jpg
      https://i.postimg.cc/tYRHtbpD/4.jpg
      2. one is messy asf
      https://i.postimg.cc/sQzLjP2K/5.jpg
      https://i.postimg.cc/dDBb0frC/6.jpg

      1. which I think that is supposed to be the one with black/green wire, have 5 wires on top and the same on the bottom and neither of them is black/green one…
        https://i.postimg.cc/946xxdTC/7.jpg
        https://i.postimg.cc/QHJRHy75/8.jpg
        https://i.postimg.cc/FY854Jcn/9.jpg
        https://i.postimg.cc/gwXSqSxg/10.jpg
        And there is also this thing...
        https://i.postimg.cc/phQgzGSg/11.jpg

      Its quite a mess so can't really see wires...If anyone knows how to check which is rev limiter wire or something please help...

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      • D
        DTR+NSR @Lukas55 last edited by

        @Lukas55 the black green wire restriction is on later dt125re and dt125x models only. Yours may have the read switch behind the speedo that needs moving away from the speedo but left connected.

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        • L
          Lukas55 @DTR+NSR last edited by

          @DTR-NSR Thanks for the answer. I thought that it might be a reed switch... What should I do with it now?

          declan 1 Reply Last reply Reply Quote 0
          • declan
            declan @Lukas55 last edited by declan

            @Lukas55 just search for a de restricting guide

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            • L
              Lukas55 @declan last edited by

              @declan I did but there is nothing specific about reed switches... This is where I am at now.
              https://i.postimg.cc/QB42SB8b/obanow.jpg

              Is the reed switch under the speedometer panel: https://i.postimg.cc/8Fz8hdSc/kmh.jpg
              https://i.postimg.cc/2LxFSsT5/kmh2.jpg
              https://i.postimg.cc/0b8h0xTc/kmh3.jpg

              or under RPMs one?
              https://i.postimg.cc/Z98mcY9s/rpm.jpg
              https://i.postimg.cc/YhQwkqRr/rpm2.jpg

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              • D
                DTR+NSR @Lukas55 last edited by

                @Lukas55 I believe it's behind the speedo. White plastic block with what looks like a glass fuse. Think it has a blue/red and black/white wire. Just wants pulling away from the speedo but not disconnecting.

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                • T
                  Thomas_Chr @Lukas55 last edited by

                  @Lukas55 https://yamahaclub.com/forums/topic/16405-dt125r-de-restriction/ This might be helpful

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                  • L
                    Lukas55 last edited by

                    Thanks for your advice. This is what I have under the clocks (pictures under the post) and I think there is no reed switch (maybe it is somewhere but I don't know how it looks), there are just some wires... There is a possibility that someone changed those wires and there is no black/green wire anymore... Please help!

                    This is under the km/h clock:
                    [url=https://postimg.cc/z32j7qCk][img]https://i.postimg.cc/z32j7qCk/kmh-2.jpg[/img][/url]

                    And this is under the RPMs clock:

                    [url=https://postimg.cc/Thd7QkZT][img]https://i.postimg.cc/Thd7QkZT/IMG-20200922-141049.jpg[/img][/url]

                    [url=https://postimg.cc/QKdfttpF][img]https://i.postimg.cc/QKdfttpF/IMG-20200922-141100.jpg[/img][/url]

                    [url=https://postimg.cc/9rxvG303][img]https://i.postimg.cc/9rxvG303/IMG-20200922-141106.jpg[/img][/url]

                    [url=https://postimg.cc/dkBWwdTM][img]https://i.postimg.cc/dkBWwdTM/IMG-20200922-141115.jpg[/img][/url]

                    [url=https://postimg.cc/BLshrNbc][img]https://i.postimg.cc/BLshrNbc/IMG-20200922-141119.jpg[/img][/url]

                    [url=https://postimg.cc/WD0WYxN1][img]https://i.postimg.cc/WD0WYxN1/IMG-20200922-141356.jpg[/img][/url]

                    D markus.w 2 Replies Last reply Reply Quote 0
                    • D
                      DTR+NSR @Lukas55 last edited by

                      @Lukas55 stolen from the Internet. alt text

                      It's hard to tell in your pics but is there slot/hole, where the reed switch would be fitted behind the speedo?

                      1 Reply Last reply Reply Quote 1
                      • Minia
                        Minia last edited by

                        https://dt125r.co.uk/topic/578/derestricting-guide

                        There is a guide on this forum already. Literally in the "derestricting" sub-forum.

                        Owned: Yamaha PW50 - Yamaha PW80 - Yamaha RT100 - Yamaha DT125R Black, 2000
                        Own: Yamaha DT125R Blue 2002, GasGas 250 Pampera 2001, XT 125 1982, Benelli BN302 2015, Yamaha WR250 1992

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                        • markus.w
                          markus.w @Lukas55 last edited by

                          @Lukas55 it is hard to see the picture but it looks to me that just under the Speedo cable connector is the place where the reed switch was, maybe it's there but the wires are not. Try tracing the wires back it may be tucked away somewhere if it's already been done or you may just find the wires had been cut with no reed switch on the end of them (it looks like a glass fuse or bulb) now I understand they shouldn't be cut off because it could cause you problems with the way it runs so maybe that is your problem.

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                          • L
                            Lukas55 @Minia last edited by

                            @Minia I know that but there is nothing similar like in my case...

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                            • L
                              Lukas55 @markus.w last edited by

                              @markus-w Thats what I thought, but there is no slot or anything where reed switch could be...
                              This is how it looks:

                              [url=https://postimg.cc/7J0LL548][img]https://i.postimg.cc/7J0LL548/IMG-20200922-181715.jpg[/img][/url]

                              [url=https://postimg.cc/pmpL9cRJ][img]https://i.postimg.cc/pmpL9cRJ/IMG-20200922-181721.jpg[/img][/url]

                              [url=https://postimg.cc/FkZ2Gvgk][img]https://i.postimg.cc/FkZ2Gvgk/IMG-20200922-181728.jpg[/img][/url]

                              [url=https://postimg.cc/vDsTPvtG][img]https://i.postimg.cc/vDsTPvtG/IMG-20200922-181733.jpg[/img][/url]

                              That means there must be some cable but obviously its not black/green because someone changed wires and made mess...
                              Like there is no white block where wires are supposed to go...It looks like this:

                              [url=https://postimg.cc/pmtsr4Dg][img]https://i.postimg.cc/pmtsr4Dg/IMG-20200922-193040.jpg[/img][/url]

                              [url=https://postimg.cc/RJHTVLqS][img]https://i.postimg.cc/RJHTVLqS/IMG-20200922-193042.jpg[/img][/url]

                              [url=https://postimg.cc/CBtNgQhr][img]https://i.postimg.cc/CBtNgQhr/IMG-20200922-193103.jpg[/img][/url]

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                              • D
                                DTR+NSR @Lukas55 last edited by

                                @Lukas55 you first need to work out what model of dtr you have, it looks like it could be a bitsa'. Be worth looking to see what markings are on the cdi and wether it has a 3 or 5 wire power valve servo.

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                                • L
                                  Lukas55 @DTR+NSR last edited by

                                  @DTR-NSR I am not sure but I think that 3 wires are coming out of servo...Markings on CDI are a little bit erased so it is not clear what does it say...
                                  https://i.postimg.cc/vDXz2TwH/cc.jpg
                                  https://i.postimg.cc/NK2k0x95/ccccc.jpg
                                  https://i.postimg.cc/ns8Y9QBT/cdi.jpg
                                  https://i.postimg.cc/RNDT9Y0k/cdii.jpg

                                  Btw what is bitsa'?

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                                  • D
                                    DTR+NSR @Lukas55 last edited by

                                    @Lukas55 bitsa = bike made up from parts from several different bikes.
                                    It sounds like your bike might have early wiring and cdi. I'd be checking the powervalve is in the open position and the exhaust has had the restrictions removed if it's a original yamaha one. Hard to make out much out from your pics.

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                                    • L
                                      Lukas55 last edited by

                                      @DTR-NSR Yea I know pictures are not great but I can not even see better with my eyes xD. It has some different exhaust I would say that it have yz 125 silincer... Okay so if the black/green wire is going into the speedo it must come from somewhere...

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                                      • L
                                        Lukas55 last edited by

                                        Btw that is 3MB cdi.

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                                        • D
                                          DTR+NSR @Lukas55 last edited by

                                          @Lukas55 the black green wire comes from the cdi, but your bike will not have the black green wire. It's only found on later bikes 2004/5 onwards. I've got a feeling yours is running about 1998 wiring and cdi. The restrictions in the exhaust are in the front expansion chamber part.

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                                          • L
                                            Lukas55 @DTR+NSR last edited by

                                            @DTR-NSR So it has only exhaust restriction?

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