Skip to content

Technical Zone

Need Information on a Specific Part? Post Here!
1.2k Topics 11.0k Posts

Subcategories


  • Suspension Related
    92 Topics
    729 Posts
    Mr ShadiM

    @SpookDog thank you for the advice lad. The dude is selling the shock because he managed to ride it so hard that it broke in half lol.

  • Exhaust Related
    57 Topics
    533 Posts
    Stevie WonderS

    If you check the pipe by where your horn is they’ll be a part number, post it on here for some comparisons. It could be a unique part to Swiss models.

  • Framework Related
    79 Topics
    576 Posts
    S

    @Stevie-Wonder

    You’re right. The recessed ones might be stretch bolts, hence the price. If they are you’re supposed to replace them each time…

  • Wheel Related
    76 Topics
    713 Posts
    CalumC

    @Vcelicka The handling on my DTR is fricken superb! I've had these tyres for ~10 years and they've been spot on. Uhhmm, I'd have to check but I'm not going into the garage now. I think it's 110 on the front. But again, I'm running different wheel/fork setup so the spacing is all different. Handles a dream though.

  • Electric Related
    241 Topics
    2k Posts
    S

    The engine stops when the connection is made, ignition is earthed. I don’t understand what your problem is?
    If you disconnect the kill switch the bike will still run…
    If you disconnect the ignition key block connector the bike will run but have no lights…
    Just fit the button and try it…

  • Brake Related
    61 Topics
    420 Posts
    CalumC

    Well I run RS 125 rear calipers on my stock DTRE master cylinder and the brakes are ace.

    On the front I swapped out the mastercylinder with something more appropriate, for said reasons....

  • Engine Related
    503 Topics
    5k Posts
    S

    @StanKn

    Mine was like it when I first sussed out it was removable. It was caked in what looked like cement dust!
    I’m glad you got it running sweet again 😜

  • Yamaha DT125R/200R Workshop Manual

    Pinned Locked
    1
    3 Votes
    1 Posts
    44 Views
    No one has replied
  • 1 Votes
    2 Posts
    633 Views
    O

    Thanks Scrim, can you email the dt125r service manual to me when you have time?
    Ta

  • Service manuals DT125R & DT200R

    2
    0 Votes
    2 Posts
    28 Views
    CalumC

    I'll PM you.

  • Seized Engine

    23
    0 Votes
    23 Posts
    266 Views
    CalumC

    @GiannisT The smart thing to do would be to tear it down and inspect/renew where appropriate. There is no shortcuts, one way or the other that engine is coming apart. If the swarf hasn't contaminated the main bearings it'll no doubt have damaged the big end bearing. Anything short cut you do will likely cause further harm and stress to other components causing bigger, more expensive, problems in the long run. That bike didn't die on tickover, going by the extent of the damage to that piston/head.

    The head needs throwing in the bin, it's trashed. You might be able to get a tuner to alter the squishband and remove the detonation/debris marks from the head, but as it stands it's a glorified paper weight.

    The problem with running damaged heads such as that, is that it encourages detonation, even if the jetting appears to be correct. In other words, it's just a shortcut to a blown engine, doubly frustrating when it's freshly built.

    My advice, don't scrimp on critical components, it'll just come back to bite you.

    You could spit the cases and inspect the components for wear. If all is in order then you may not need to renew (although I would anyway).

    You could just inspect it in situ and see if the float is okay and if the big end bearing is damaged by checking for play. No way to tell about the mains or crankcase seals without tearing it apart. If debris has contaminated the seals then it will never idle/run right.

  • 1998 TDR 125 4FU Engine Cutting Out When Warm

    7
    0 Votes
    7 Posts
    96 Views
    L

    @SpookDog I believe I have fixed it now. Swapped out the voltage regulator got it up to temps and it ran fine.

  • This topic is deleted!

    1
    0 Votes
    1 Posts
    1 Views
    No one has replied
  • MPH Speedo wanted for 1998 DT 125R

    13
    0 Votes
    13 Posts
    182 Views
    P

    So the converter is only converting to match the KPH face then and not a real converter i.e. really changing to mph. Sounds like I need to find a proper MPH speedo after all! Don't suppose you have a good one you fancy selling? Appreciate your help as you have saved me a lot of aggro. Cheers

  • Dt200r oil pump

    4
    -1 Votes
    4 Posts
    116 Views
    S

    @old-boy-racer

    Don’t forget that the oil pump is calibrated to the carb. It’s the right amount of oil for the air-petrol mix going in. If you put a much bigger carb on I would start thinking about the oil pump…
    Do you get what I’m saying? The pump is running at 50:1 why would premixing at 50:1 be any different? Think about it 🙂 …

    PS what carb does the Dtr 200 run? Cause the pump is calibrated to the carb, not the cylinder…

  • DT125 re wheels conversion issue

    4
    0 Votes
    4 Posts
    139 Views
    markus.wM

    @jarvis2292 they will fit also.

  • Help me

    Moved
    6
    0 Votes
    6 Posts
    186 Views
    CalumC

    @Hybrid_Theory01 It won't be the gearing, it'll be the starter. It's the same as if you bump start your motorbike in reverse then it'll go in reverse.

    So the kick starter mechanism probably isn't correct.

    Although, I cannot visualise how this can be the case. I can't see how the gearbox can be assembled in such a way, so the only thing I can think of is the engine going around the wrong direction.

  • Very Smokie

    17
    0 Votes
    17 Posts
    327 Views
    S

    @SpookDog
    Now there’s some miles on it We’ve been opening it up a bit. Still running Kmh clocks and I kinda know they will be out but with me pushing 14 stone that’s close to 90kg in new money with jacket helmet boots n gloves it’s revving out in 5th and pushing 9.5k in top well into the 120-130kmh. So I’m well happy. One thing I am really pleased about is it’s still pulling past the power through the gears and it didn’t drop past 8k with a bit of an incline. I’m sure if I was 17 again weighing in at 10 stone wet it would be well into the red.
    The exhaust tone from the full DEP just makes you want to blast it everywhere

  • Engine identification required

    1
    0 Votes
    1 Posts
    73 Views
    No one has replied
  • Carb coolant lines

    3
    0 Votes
    3 Posts
    162 Views
    Deigo27D

    @markus-w cheers mare just wanted to be 100% sure, just cleaned carb today n was full of varnish looking petrol cos bikes been sat ages, jets were blocked too really dirty tbh! Cleaned n refitted but just looped head hose to other head pipe n done same with carb pipes.. I'm in Scotland, cheers mate👍🏼

  • Dt 125 1993 How to derestict

    4
    0 Votes
    4 Posts
    170 Views
    CalumC

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

  • Front forks help PLEASE!

    4
    0 Votes
    4 Posts
    170 Views
    CalumC

    @perky Yes, that's what someone said the other day.

    The DTX Runs a Brembo Caliper too, which won't fit DTX forks.

  • forks

    11
    0 Votes
    11 Posts
    296 Views
    F

    @calum pulled it out to get a pic ended up pulling legs to see what crack is, dtx stanchions are shorter, the insides are slightly different too ive added a shim/washer ontop of the springs seems to have lifted it abit but still not quite there, not sure how to upload a pic as it says its too big of file

  • Yz mudguards

    3
    0 Votes
    3 Posts
    152 Views
    NottsbikerN

    Fit fine on the 125 only need drilling if UFO or Acerbis etc

    Put one on my DT200WR but had to cut the back of it down as it hit the rads 😞

  • DT125 R(4BL) Parts no longer available (new)

    1
    0 Votes
    1 Posts
    130 Views
    No one has replied
  • Tacho reading 1500 when engine not running

    3
    0 Votes
    3 Posts
    152 Views
    G

    Hi, okay, thanks @declan - may try and get it open , knowing there will be a backup plan!

  • Dt 125re No power.

    4
    0 Votes
    4 Posts
    188 Views
    declanD

    @Baileyboy2008 well like Calum pointed out there’s no such thing as pinning your valve half way if the valve is have way closed you will get zero power above 6k open her all the way and then see what it does