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    Spark plug

    Welcome New Owners!
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    • shaunp1912
      shaunp1912 last edited by

      Afternoon
      I have just pulled the plug and it’s balck and oily, I take it it’s running rich. How do you adjust the mixer ? Or is there something else that needs doing

      NINJA 1 Reply Last reply Reply Quote 0
      • NINJA
        NINJA @shaunp1912 last edited by NINJA

        @shaunp1912 Hi, it's always advisable to say hello and introduce yourself if your new to the forum. There's a screw on the side of the carb to adjust the mixture, but I would strongly suggest you check the manuals before tinkering. Plus you have not stated which bike version you have. We're happy to help but are not mind readers, please provide more details and better yet photos of your bike. A Haynes manual is a must have and can be easily found on ebay and service manuals can be downloaded from here;

        https://www.manualslib.com/manual/611219/Yamaha-Dt125r.html

        http://www.scrimsmustangclassicyamahadtrestoration.com/yamaha-dt-parts-book-list-and-service-manuals-free-download.html

        1 Reply Last reply Reply Quote 0
        • shaunp1912
          shaunp1912 last edited by

          Sorry not had the bike long it’s a 1990 125 dtr Swiss import. Have tried to up load some photos but no joy.
          Looks like it has not been touched for years. Got a new plug air filter exhaust tyres. Changed the oil and it runs ok very quick up to 60 then dies a death

          NINJA 1 Reply Last reply Reply Quote 1
          • NINJA
            NINJA @shaunp1912 last edited by

            @shaunp1912 As in the engine cuts out at 60mph or it just tops out and won't go any faster???

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            • shaunp1912
              shaunp1912 last edited by

              Just tops out, and won’t pull, did have issues when I 1st got it the battery was shot and the power valve didn’t move. But fitted new battery and was a lot better, but worried at the condition of the plug

              NINJA 1 Reply Last reply Reply Quote 0
              • NINJA
                NINJA @shaunp1912 last edited by

                @shaunp1912 It sounds like the bike is being restricted, see here on how to remove those restrictions;

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

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                • shaunp1912
                  shaunp1912 last edited by

                  ![alt text](image url)[url=https://postimg.cc/bSf5q70s][img]https://i.postimg.cc/prmMJxpY/8-E04586-B-0038-4-ED3-8031-3102-BB56898-F.jpg[/img][/url]

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                  • shaunp1912
                    shaunp1912 last edited by

                    Cannot see a mixture screw

                    NINJA 2 Replies Last reply Reply Quote 0
                    • NINJA
                      NINJA @shaunp1912 last edited by

                      @shaunp1912 It's the big phillips screw in the center of that picture. 😉

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                      • NINJA
                        NINJA @shaunp1912 last edited by

                        @shaunp1912 Oh and BTW see this also;

                        https://dt125r.co.uk/topic/5/embedding-images

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                        • shaunp1912
                          shaunp1912 last edited by

                          I thought that was the idle screw. Oh well every days a school day
                          Cheers

                          NINJA 1 Reply Last reply Reply Quote 0
                          • NINJA
                            NINJA @shaunp1912 last edited by NINJA

                            @shaunp1912 There's lots of info on here, please use the search engine;

                            See here dude;

                            https://dt125r.co.uk/topic/32/how-to-carburettor-tuning

                            http://www.ngksparkplugs.co.za/technical/technical-spark-plugs/

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