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Technical Zone

1.3k Topics 11.5k Posts
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  • Suspension Related
    100 768
    100 Topics
    768 Posts
    HOTSHOT IIIH
    @reudtr88 The seller is right, the spacers and caliper bracket are narrower than the DT125R versions. The bench mock-up in the pics above comprised a 3ET DT200R swingarm, caliper hanger and spacers mated to a DT125R hub. As you can see the 428 sprockets lined up quite well (I also had to use a 3mm thick M20 washer between the caliper hanger and swingarm to get it as good as it could possibly be with the items I had to hand).

  • Exhaust Related
    64 569
    64 Topics
    569 Posts
    D
    as far as i m aware there are 3 different types of tzr the first model series 2 (RR) an tzr125r sp i have an exhaust with the code 4DL E46 10 20 what model is it intended for

  • Framework Related
    86 606
    86 Topics
    606 Posts
    CalumC
    That's normal. All DTs are like that. [image: IMG-20251011-114625.jpg]

  • Wheel Related
    83 748
    83 Topics
    748 Posts
    K
    @Rallyfinnen I'm mainly worried about the fork sitting incorrectly resulting in leaky fork seals. The bike handled good but the seals did go out and I rebuilt it. How can I check if the wheel is perfectly centered?

  • Electric Related
    265 2k
    265 Topics
    2k Posts
    CalumC
    I'm sure someone here will be able to point you in the right direction. What we've been seeing in recent times are a lot of DTRs being imported from Europe, these can come with subtle differences, this may be the case here. This is the 3NC wiring diagram. [image: 52172141696_84e3b69382_b.jpg] I only have a Haynes manual so can't speak for what other diagrams look like. I have also hosted the workshop manuals here: https://dt125r.co.uk/topic/3258/yamaha-dt125r-200r-workshop-manual https://training.dt125r.co.uk/files/Yamaha_DT125_Workshop_Manual.pdf This may be useful.

  • Brake Related
    68 453
    68 Topics
    453 Posts
    CalumC
    Yeah that sounds like a good idea and should be easy to swap the wheels over without too much faff!

  • Engine Related
    545 5k
    545 Topics
    5k Posts
    H
    Got it, thanks for your help everyone. Was planning to have a go but then had an episode and ended up in hospital. Now I'm back in the game.
  • S

    Clutch lever and brake levers

    11
    0 Votes
    11 Posts
    2k Views
    F
    I've got some eBay specials on mine, they were listed for the DT230 but fit ok. Might fit the DTR as well?
  • declanD

    Rad caps aren’t universal?

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    0 Votes
    9 Posts
    1k Views
    declanD
    @NINJA not a clue but luckily it’s not a problem
  • B

    Bike vibrating when revved

    2
    0 Votes
    2 Posts
    686 Views
    CalumC
    Either the balancer shaft, the engine needs timing. Or the clutch hasn't been balanced. The clutch needs to be reassembled in the correct sequence. See my kickstart conversion guide.
  • D

    What is this plastic part in the carb called?

    4
    0 Votes
    4 Posts
    965 Views
    Louis-DT-WRL
    Other name for it is a jet baffle
  • Y

    Oil Questions

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    0 Votes
    40 Posts
    15k Views
    2
    Always used Silkolene Comp 2 which is best oil there is either premix or injector oil.. £38.90 for 4 Litres so £9.72 per Litres https://www.ebay.co.uk/itm/Silkolene-Comp-2-2T-2-Stroke-Motorcycle-Engine-Oil-4-Litres-4L/161276818881?epid=10017008607&hash=item258cd8f5c1:g:NEQAAOSwcwhVP4E0
  • B

    Disconnect oil tank?

    9
    0 Votes
    9 Posts
    1k Views
    declanD
    @glynn123 they can fail although it is pretty rare I think they have way more positives I’d never disconnect mine I wish all bikes came with an optional oil fed system
  • B

    Few problems with my dt125re

    15
    0 Votes
    15 Posts
    3k Views
    CalumC
    @bradt The system will incur a known internal resistence with itself, known as impedence. This can be measured. It should fall within a tolerable range, as described by the technical specification of the item. Compare your component against this documentation to ensure the item is within tolerance. Chances are, if it is, then the item is not faulty.
  • T

    Power valve issue

    35
    0 Votes
    35 Posts
    8k Views
    CalumC
    @thechompster And ignitech
  • D

    Stuck seized pivot bolt

    15
    0 Votes
    15 Posts
    3k Views
    FusedF
    On my first DT after several days of trying to remove the bolt, I eventually got it to budge by doing a continuous heat cycle on it, and going at it with a club hammer and drift. When you thinks it got to be hot enough by now...give it another couple of minutes with the blow torch.
  • B

    Ypvs cap broken

    2
    0 Votes
    2 Posts
    726 Views
    CalumC
    It'll need ally welding if you have the pieces, otherwise you'll have to get another one.
  • Glynn123G

    DT125 Front brake caliper bracket dimensions?

    4
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    4 Posts
    2k Views
    CalumC
    @glynn123 Only messing mate. Was on here though.
  • olliedtx12sO

    Ypvs barrel removal

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    4 Posts
    1k Views
    Sgt Robuck 5S
    @olliedtx12s If you need to locate any specific parts click on this and I suggest getting a haynes manual Found on here Amazon
  • declanD

    What hearing yall running?

    24
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    24 Posts
    4k Views
    CalumC
    @finnerz89 One day for sure mate...one day.
  • FusedF

    5 wires to 3

    4
    1 Votes
    4 Posts
    1k Views
    FusedF
    Thanks Calum, I'll shelve that idea for now then..
  • declanD

    Does a rich pilot effect riding

    38
    0 Votes
    38 Posts
    7k Views
    Irongamer727I
    @declan 😂😂😂
  • Glynn123G

    320mm discs that fit DTX Front hub?

    2
    0 Votes
    2 Posts
    854 Views
    CalumC
    Doubtful, but an adapter shouldn't be too hard to make. Just make sure you centralise the caliper over the disc.
  • declanD

    2 stroke timing “stator”

    12
    0 Votes
    12 Posts
    2k Views
    declanD
    @sgt-robuck-5 ahhh very far then
  • declanD

    General a/f adjustment

    3
    0 Votes
    3 Posts
    872 Views
    declanD
    @finnerz89 yes they are
  • declanD

    Carb settings help

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    4 Posts
    1k Views
    declanD
    @oldman well it looked 40 years old and was visually worn out looked well used if I tried to ride the bike to set off I’d have to redline and ride the clutch then soon as I shift out of 2nd the bike would lose all power and come to a stop then would bog and stutter it seems better with the carb on the garden not tested the street yet
  • SpannersS

    3BN CDI

    4
    0 Votes
    4 Posts
    1k Views
    J
    Why not make adaptor/converter loom, between the cdi and the main loom, so you can connect everything up without molesting either part.