Skip to content
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
Skins
  • Light
  • Cerulean
  • Cosmo
  • Flatly
  • Journal
  • Litera
  • Lumen
  • Lux
  • Materia
  • Minty
  • Morph
  • Pulse
  • Sandstone
  • Simplex
  • Sketchy
  • Spacelab
  • United
  • Yeti
  • Zephyr
  • Dark
  • Cyborg
  • Darkly
  • Quartz
  • Slate
  • Solar
  • Superhero
  • Vapor

  • Default (Slate)
  • No Skin
Collapse
Brand Logo

DT125R FORUM

  1. Home
  2. Technical Zone
  3. Engine
  4. Need help

Need help

Scheduled Pinned Locked Moved Engine
167 Posts 11 Posters 46.0k Views
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • V vtrn_raptor

    Spark plugs brand new and was only sat for around a month but was doing the same thing when I put it in for a mot

    terry.tzT Offline
    terry.tzT Offline
    terry.tz
    wrote on last edited by
    #7

    @vtrn_raptor could be anything that bud but everything can be fixed so get diagnosing put a pic up of spark plug after running the engine for a 10sec's

    "Muddy water is best cleared by leaving it alone" Alan Watts

    1 Reply Last reply
    0
    • NottsbikerN Offline
      NottsbikerN Offline
      Nottsbiker
      wrote on last edited by
      #8

      You really want to do a proper plug chop by riding the bike not just running it for 10 mins

      CalumC terry.tzT 2 Replies Last reply
      0
      • NottsbikerN Nottsbiker

        You really want to do a proper plug chop by riding the bike not just running it for 10 mins

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

        @nottsbiker Well he can't it's not running right it bogs out and dies.

        Sounds like a fueling issue to me.

        What's the colour of the plug bud?

        Is it smoking heavily?

        Always Originate, Never Pirate!

        NottsbikerN 1 Reply Last reply
        0
        • NottsbikerN Nottsbiker

          You really want to do a proper plug chop by riding the bike not just running it for 10 mins

          terry.tzT Offline
          terry.tzT Offline
          terry.tz
          wrote on last edited by
          #10

          @nottsbiker this is diagnosing not tuning and it for 10 sec's just enough to see the plug fresh out from running

          "Muddy water is best cleared by leaving it alone" Alan Watts

          1 Reply Last reply
          0
          • V Offline
            V Offline
            vtrn_raptor
            wrote on last edited by
            #11

            It's smoking a bit and I've checked the plug after trying to ride it for a bit and their was no change in colour this bikes irritating the shit outa me to be fair stands me in about 2500 now and it still won't run right changed piston and rings changed carb changed coil cdi and still won't run right

            terry.tzT CalumC 2 Replies Last reply
            0
            • V vtrn_raptor

              It's smoking a bit and I've checked the plug after trying to ride it for a bit and their was no change in colour this bikes irritating the shit outa me to be fair stands me in about 2500 now and it still won't run right changed piston and rings changed carb changed coil cdi and still won't run right

              terry.tzT Offline
              terry.tzT Offline
              terry.tz
              wrote on last edited by
              #12

              @vtrn_raptor can you not take pictures and videos this all seems vague

              "Muddy water is best cleared by leaving it alone" Alan Watts

              1 Reply Last reply
              1
              • CalumC Calum

                @nottsbiker Well he can't it's not running right it bogs out and dies.

                Sounds like a fueling issue to me.

                What's the colour of the plug bud?

                Is it smoking heavily?

                NottsbikerN Offline
                NottsbikerN Offline
                Nottsbiker
                wrote on last edited by
                #13

                @calum said in Need help:

                @nottsbiker Well he can't it's not running right it bogs out and dies.

                Sounds like a fueling issue to me.

                What's the colour of the plug bud?

                Is it smoking heavily?

                I did originally suggest checking the wiring and carb 😉

                1 Reply Last reply
                0
                • V vtrn_raptor

                  It's smoking a bit and I've checked the plug after trying to ride it for a bit and their was no change in colour this bikes irritating the shit outa me to be fair stands me in about 2500 now and it still won't run right changed piston and rings changed carb changed coil cdi and still won't run right

                  CalumC Offline
                  CalumC Offline
                  Calum
                  wrote on last edited by
                  #14

                  @vtrn_raptor Right, I don't think you're really addressing the problem though.

                  You need to understand why it's not running right, rather than just swapping components out.

                  I get the impression, and I could be entirely wrong, that you're changing out components willy

                  These bikes are so simple, it should only cost a tenth of that to sort this bike out, £2500 would have been a full restoration budget, not "get it running" perse.

                  As Terry Said, pictures and videos would be so helpful to us, if that's too much then, dare I say it, maybe just take it to a bike specialist. It literally shouldn't cost you that much to get it running.

                  I feel like you need a better understanding of the core concepts to these bikes, and maybe I suggest reading about two stroke engines in general might help.

                  You literally should be able to get the engine running sweet on a bench with very minimal tools.

                  From your vague description, it sounds like a jetting issue. And I don't mean replace the carb, I mean ensure that the end to end system has been installed to factory specifications.

                  Return the bike back to how it was out the factory, get a haynes manual, look up the specs, get it boggo standard. That's the easiest way to get it running right. Then bolt on tuning parts one at a time jetting accordingly.

                  Always Originate, Never Pirate!

                  1 Reply Last reply
                  1
                  • V Offline
                    V Offline
                    vtrn_raptor
                    wrote on last edited by
                    #15

                    Well I'm just going to take it somewhere reliable I think and get it done professionally as everything I've replaced was needed and still won't run right so shouldn't cost me much putting into a shop as brought all the expensive stuff

                    terry.tzT 1 Reply Last reply
                    0
                    • V vtrn_raptor

                      Well I'm just going to take it somewhere reliable I think and get it done professionally as everything I've replaced was needed and still won't run right so shouldn't cost me much putting into a shop as brought all the expensive stuff

                      terry.tzT Offline
                      terry.tzT Offline
                      terry.tz
                      wrote on last edited by
                      #16

                      @vtrn_raptor do what you think best mate it's a safe option but personally, I think you would be better off doing it your self save a few pounds and have a better knowledge for next time

                      "Muddy water is best cleared by leaving it alone" Alan Watts

                      1 Reply Last reply
                      0
                      • V Offline
                        V Offline
                        vtrn_raptor
                        wrote on last edited by
                        #17

                        I would do it myself but I literally have no clue what's wrong with it and don't have the money to put it back standard

                        terry.tzT 1 Reply Last reply
                        0
                        • NottsbikerN Offline
                          NottsbikerN Offline
                          Nottsbiker
                          wrote on last edited by
                          #18

                          I bet that the shop will also want to put it back to standard to get it running correctly. Ideally you want to use a two stroke tuner / specialist so that they understand the issue and can both diagnose and then solve it.

                          Many shops these days might not have as much knowledge of two strokes as one was the norm 🙂

                          1 Reply Last reply
                          0
                          • V vtrn_raptor

                            I would do it myself but I literally have no clue what's wrong with it and don't have the money to put it back standard

                            terry.tzT Offline
                            terry.tzT Offline
                            terry.tz
                            wrote on last edited by
                            #19

                            @vtrn_raptor no no no we don't mean buying original exhaust ect we mean to put the carb and a few other bits if you have them back to standard and honestly we understand you don't have a clue at the end of the day it's your bike and your choice but you would really benefit from doing it your self and save money at the same time really it easy just looks hard pal just throw some pics up mate it could be an easy fix you just don't know how it works yet

                            "Muddy water is best cleared by leaving it alone" Alan Watts

                            CalumC 1 Reply Last reply
                            0
                            • terry.tzT terry.tz

                              @vtrn_raptor no no no we don't mean buying original exhaust ect we mean to put the carb and a few other bits if you have them back to standard and honestly we understand you don't have a clue at the end of the day it's your bike and your choice but you would really benefit from doing it your self and save money at the same time really it easy just looks hard pal just throw some pics up mate it could be an easy fix you just don't know how it works yet

                              CalumC Offline
                              CalumC Offline
                              Calum
                              wrote on last edited by
                              #20

                              @terry-tz said in Need help:

                              @vtrn_raptor no no no we don't mean buying original exhaust ect we mean to put the carb and a few other bits if you have them back to standard and honestly we understand you don't have a clue at the end of the day it's your bike and your choice but you would really benefit from doing it your self and save money at the same time really it easy just looks hard pal just throw some pics up mate it could be an easy fix you just don't know how it works yet

                              Is he really saving any money though? I mean if he's spent 2.5k on it and still not solved it, then obviously he's just throwing money away.

                              Second that though, most shops are going to return it to stock trim to fix it.

                              I can't see it being anything particularly difficult.

                              Always Originate, Never Pirate!

                              terry.tzT 1 Reply Last reply
                              0
                              • CalumC Calum

                                @terry-tz said in Need help:

                                @vtrn_raptor no no no we don't mean buying original exhaust ect we mean to put the carb and a few other bits if you have them back to standard and honestly we understand you don't have a clue at the end of the day it's your bike and your choice but you would really benefit from doing it your self and save money at the same time really it easy just looks hard pal just throw some pics up mate it could be an easy fix you just don't know how it works yet

                                Is he really saving any money though? I mean if he's spent 2.5k on it and still not solved it, then obviously he's just throwing money away.

                                Second that though, most shops are going to return it to stock trim to fix it.

                                I can't see it being anything particularly difficult.

                                terry.tzT Offline
                                terry.tzT Offline
                                terry.tz
                                wrote on last edited by
                                #21

                                @calum the bike runs sounds like he been playing with it so it not chewing itself to bits on the inside considering he been redlining on a stand so the bike should be an easy fix in my opinion 2.5k tho @vtrn_raptor I could buy a few dt125r's for that just make a new thread call it the 2.5k black hole and start from scratch give us the bike details in the description ie year, model and any mods don't focus on a symptom yet just get some pics up

                                "Muddy water is best cleared by leaving it alone" Alan Watts

                                1 Reply Last reply
                                1
                                • NottsbikerN Offline
                                  NottsbikerN Offline
                                  Nottsbiker
                                  wrote on last edited by
                                  #22

                                  Could be a conflict between old generators and new CDI's (for example) but with that amount of money being spent on it chances are its now something relatively simple

                                  I do however appreciate how frustrating these problems can be at time and how you want to murder someone when you've taken a carb apart 58 times 😉

                                  1 Reply Last reply
                                  0
                                  • V Offline
                                    V Offline
                                    vtrn_raptor
                                    wrote on last edited by
                                    #23

                                    Just done a compression test and it's at 100psi is that low ?

                                    1 Reply Last reply
                                    0
                                    • V Offline
                                      V Offline
                                      vtrn_raptor
                                      wrote on last edited by
                                      #24

                                      And the spark plug is black was a brand new one

                                      CalumC terry.tzT 2 Replies Last reply
                                      0
                                      • V vtrn_raptor

                                        And the spark plug is black was a brand new one

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

                                        @vtrn_raptor Sounds like it's running rich. Is it sooty? Could be too much oil.

                                        Two strokes don't have too much compression.

                                        Always Originate, Never Pirate!

                                        1 Reply Last reply
                                        0
                                        • V Offline
                                          V Offline
                                          vtrn_raptor
                                          wrote on last edited by
                                          #26

                                          I'll take a photo now

                                          1 Reply Last reply
                                          0
                                          Reply
                                          • Reply as topic
                                          Log in to reply
                                          • Oldest to Newest
                                          • Newest to Oldest
                                          • Most Votes


                                          • Login

                                          • Don't have an account? Register

                                          • Login or register to search.
                                          • First post
                                            Last post
                                          0
                                          • Recent
                                          • Tags
                                          • Popular
                                          • Users
                                          • Groups