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. Owners Build Threads
  3. DTR
  4. Dtr 125 1997 Rebuild/Restoration

Dtr 125 1997 Rebuild/Restoration

Scheduled Pinned Locked Moved DTR
20 Posts 4 Posters 1.6k 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.
  • Mr ShadiM Mr Shadi

    I forgot to add that I use this motorcycle as a daily driver and as a dirt bike on the track. Its really good on the track but my suspension is too soft and I cant jump with it.

    HOTSHOT IIIH Offline
    HOTSHOT IIIH Offline
    HOTSHOT III
    wrote on last edited by
    #3

    @Mr-Shadi Here's a link to a YZ-style rear mudguard designed to fit the DTR:

    https://www.bikerpartshop.com/en/home/24-rear-fender-mudguard-cross-for-yamaha-dtr-125-200.html

    In fact you can replace all the plastics from here pretty cheaply and they fit well. I'd sooner do that than paint your originals as painting itself costs money and plastics are very difficult to do well, they flex leading to the paint cracking quite quickly:

    https://www.bikerpartshop.com/en/17-dtr

    Also this guy on eBay does some very good quality graphics:

    https://www.ebay.co.uk/usr/hazard_graphics?_trksid=p4429486.m3561.l2559

    There's not really anything wrong with the stock DTR front end structurally; the springs are just too soft for off-roading. 41mm stanchions are only like 2mm smaller than the 200kg+ GSX-R1100 when the DTR was released in 1988. You can make major improvements to the DTR suspension by running XT600 3AJ fork springs (same size but 20% stiffer) and 15W oil at the stock level, a relatively cheap fix which means you can spend the money you have left over on an adjustable YSS shock, again a major upgrade for the bike (although I have heard of people fitting an XT600E spring to the rear shock to stiffen that up as well). Doing this made my '98 DTRe jump and resist bottoming a lot better than the 2020 KTM 250EXC I also owned at the time. Also get a grease gun (£25 on eBay) so you can keep lubing up the swingarm/linkage bearings after every wash/offroad riding session.

    Some people do the USD front end swap but the trouble with this is, most of them you get down the breakers have had a hard life on MX bikes so you really need 3-4 sets exactly the same make/model/year to ensure you have spares (a lot of people "fit YZ bits" not realising MX bikes are updated EVERY year). Fun fact: when the 1st-generation USD forks appeared in 1989, Kawasaki USA (i.e 7-times US national MX/SX champion Jeff Ward) tested them in Japan and weren't impressed; they opted for the 46mm conventional forks to be fitted to all '89 KXs sold in the US which performed better than the USDs by all accounts. Even today in vintage MX circles, an '89 KX250/500 imported from the US is very sought after.

    Other off-road preparation: Get a cable oiler from Yambits and lube the cables with Comma Spray Grease. Also Yambits air filter elements are very good quality, fit well and are half the price of OEM so it's worth getting a few of these and cleaning oiling them in rotation so it's easy to just throw on a fresh one after every wash. Seal the carb-to-airbox rubber with petrol- and oil-resistant glue as this is downstream of the filter and your engine can suck dirt if this isn't done:

    alt text

    https://www.repairingproducts.co.uk/product/seal-all-gas-oil-resistant-adhesive/

    Use more Seal-All to replace the 5mm air filter foam on the back of the element holder where it slides into the airbox (5mm air filter foam is cheap on eBay).

    Run a 100/80W halogen bulb in the stock headlight; Yamaha cheaped out and fitted a 45/40W candle from new but the actual light is the same unit as 900cc+ Yamaha superbikes of the day and the DTR's AC lighting means high wattage bulbs won't flatten the battery. This lights up the trails like a rally car.

    https://www.ebay.co.uk/itm/161339938963?hash=item25909c1893:g:1~UAAOSwewJTn~QT&amdata=enc%3AAQAIAAAAwF8Gw72CnU%2FbU0Zeu1tjSRJFvfcr8SwbZT4fRnA6WLf6yF0iSX4F43bpTTUSgtfBldUiHC5ZK%2FpBDTqyiUrkkLM1DnUZX3SpndwKFrd3AycaXs42lcD4nO8uCIBGqjOj2yxKm7ISu7XCKqXuoWlB2UdVLLtEbpVg58COnWlHuhX4LEbzOoQS8f2k91yKG7cYwxb4xv0f5vYRwL0tAqohcx0Uu%2BRV%2FxZvGfw92kfBlnQ18P09gli11QmJT0AILJG5pw%3D%3D|tkp%3ABk9SR_TwtqeSYw

    Make your own powervalve cables from MTB gear cables so you can re-lube them in situ; these cost less than buying a genuine set, last longer and protect your valuable YPVS servo:

    https://dt125r.co.uk/topic/2971/home-made-quick-lube-ypvs-powervalve-cables

    Mr ShadiM 1 Reply Last reply
    1
    • HOTSHOT IIIH HOTSHOT III

      @Mr-Shadi Here's a link to a YZ-style rear mudguard designed to fit the DTR:

      https://www.bikerpartshop.com/en/home/24-rear-fender-mudguard-cross-for-yamaha-dtr-125-200.html

      In fact you can replace all the plastics from here pretty cheaply and they fit well. I'd sooner do that than paint your originals as painting itself costs money and plastics are very difficult to do well, they flex leading to the paint cracking quite quickly:

      https://www.bikerpartshop.com/en/17-dtr

      Also this guy on eBay does some very good quality graphics:

      https://www.ebay.co.uk/usr/hazard_graphics?_trksid=p4429486.m3561.l2559

      There's not really anything wrong with the stock DTR front end structurally; the springs are just too soft for off-roading. 41mm stanchions are only like 2mm smaller than the 200kg+ GSX-R1100 when the DTR was released in 1988. You can make major improvements to the DTR suspension by running XT600 3AJ fork springs (same size but 20% stiffer) and 15W oil at the stock level, a relatively cheap fix which means you can spend the money you have left over on an adjustable YSS shock, again a major upgrade for the bike (although I have heard of people fitting an XT600E spring to the rear shock to stiffen that up as well). Doing this made my '98 DTRe jump and resist bottoming a lot better than the 2020 KTM 250EXC I also owned at the time. Also get a grease gun (£25 on eBay) so you can keep lubing up the swingarm/linkage bearings after every wash/offroad riding session.

      Some people do the USD front end swap but the trouble with this is, most of them you get down the breakers have had a hard life on MX bikes so you really need 3-4 sets exactly the same make/model/year to ensure you have spares (a lot of people "fit YZ bits" not realising MX bikes are updated EVERY year). Fun fact: when the 1st-generation USD forks appeared in 1989, Kawasaki USA (i.e 7-times US national MX/SX champion Jeff Ward) tested them in Japan and weren't impressed; they opted for the 46mm conventional forks to be fitted to all '89 KXs sold in the US which performed better than the USDs by all accounts. Even today in vintage MX circles, an '89 KX250/500 imported from the US is very sought after.

      Other off-road preparation: Get a cable oiler from Yambits and lube the cables with Comma Spray Grease. Also Yambits air filter elements are very good quality, fit well and are half the price of OEM so it's worth getting a few of these and cleaning oiling them in rotation so it's easy to just throw on a fresh one after every wash. Seal the carb-to-airbox rubber with petrol- and oil-resistant glue as this is downstream of the filter and your engine can suck dirt if this isn't done:

      alt text

      https://www.repairingproducts.co.uk/product/seal-all-gas-oil-resistant-adhesive/

      Use more Seal-All to replace the 5mm air filter foam on the back of the element holder where it slides into the airbox (5mm air filter foam is cheap on eBay).

      Run a 100/80W halogen bulb in the stock headlight; Yamaha cheaped out and fitted a 45/40W candle from new but the actual light is the same unit as 900cc+ Yamaha superbikes of the day and the DTR's AC lighting means high wattage bulbs won't flatten the battery. This lights up the trails like a rally car.

      https://www.ebay.co.uk/itm/161339938963?hash=item25909c1893:g:1~UAAOSwewJTn~QT&amdata=enc%3AAQAIAAAAwF8Gw72CnU%2FbU0Zeu1tjSRJFvfcr8SwbZT4fRnA6WLf6yF0iSX4F43bpTTUSgtfBldUiHC5ZK%2FpBDTqyiUrkkLM1DnUZX3SpndwKFrd3AycaXs42lcD4nO8uCIBGqjOj2yxKm7ISu7XCKqXuoWlB2UdVLLtEbpVg58COnWlHuhX4LEbzOoQS8f2k91yKG7cYwxb4xv0f5vYRwL0tAqohcx0Uu%2BRV%2FxZvGfw92kfBlnQ18P09gli11QmJT0AILJG5pw%3D%3D|tkp%3ABk9SR_TwtqeSYw

      Make your own powervalve cables from MTB gear cables so you can re-lube them in situ; these cost less than buying a genuine set, last longer and protect your valuable YPVS servo:

      https://dt125r.co.uk/topic/2971/home-made-quick-lube-ypvs-powervalve-cables

      Mr ShadiM Offline
      Mr ShadiM Offline
      Mr Shadi
      wrote on last edited by
      #4

      @HOTSHOT-III Thank you lad. I saw a video on yt about the tz style plastic but the link didnt work and google gave me nothing. Also i ride it as a hobby and mostly smaller tracks bc the bike struggles on bigger tracks, i live in Estonia. And about the suspention i was thinking on the rear shock you gave, but the front. I was thinking on putting heavier oil like w20 and spacers on the springs. As i said my budget isnt that big and most of it is going in to the restoration so i am going to be left with probably 300 to 200 euro for straight upgrades and new parts. I am gonna respond to this in more detail after Christmas. Right now im typing this on my phone and im a bit of a hurry with the Holliday activities.

      S 1 Reply Last reply
      2
      • CalumC Offline
        CalumC Offline
        Calum
        wrote on last edited by
        #5

        I ended up fitting WR450F forks on my DT. The forks and yokes cost probably around £200 and then it was just the case of turning up a spacer on the lathe and adding a brake backet. The result was fully adjustable front suspension, hard for the road and soft for the dirt trails

        Always Originate, Never Pirate!

        1 Reply Last reply
        0
        • Mr ShadiM Mr Shadi

          @HOTSHOT-III Thank you lad. I saw a video on yt about the tz style plastic but the link didnt work and google gave me nothing. Also i ride it as a hobby and mostly smaller tracks bc the bike struggles on bigger tracks, i live in Estonia. And about the suspention i was thinking on the rear shock you gave, but the front. I was thinking on putting heavier oil like w20 and spacers on the springs. As i said my budget isnt that big and most of it is going in to the restoration so i am going to be left with probably 300 to 200 euro for straight upgrades and new parts. I am gonna respond to this in more detail after Christmas. Right now im typing this on my phone and im a bit of a hurry with the Holliday activities.

          S Offline
          S Offline
          SpookDog
          wrote on last edited by SpookDog
          #6

          @Mr-Shadi

          Putting washers or spacers in the forks doesn’t make them harder. It just pre-compresses the springs. Heavier oil will change the dampening, but also won’t make the suspension harder…

          I spent £100 on (progressive) aftermarket springs. They’ve changed the whole feel of the bike for the better. I’m not doing air with it though 🙂 It’s aimed at road use mainly, a lot more stable at speed…

          Mr ShadiM 1 Reply Last reply
          1
          • S SpookDog

            @Mr-Shadi

            Putting washers or spacers in the forks doesn’t make them harder. It just pre-compresses the springs. Heavier oil will change the dampening, but also won’t make the suspension harder…

            I spent £100 on (progressive) aftermarket springs. They’ve changed the whole feel of the bike for the better. I’m not doing air with it though 🙂 It’s aimed at road use mainly, a lot more stable at speed…

            Mr ShadiM Offline
            Mr ShadiM Offline
            Mr Shadi
            wrote on last edited by
            #7

            @SpookDog i just got new front fork from my uncle. He had a yamaha dt 125 back in the day, but i dont know witch year. il send a pic of them soon. The fork has adjustability settings on top and also bottom. They need a oil change but should be good for replacement front forks.

            S 1 Reply Last reply
            0
            • Mr ShadiM Mr Shadi

              @SpookDog i just got new front fork from my uncle. He had a yamaha dt 125 back in the day, but i dont know witch year. il send a pic of them soon. The fork has adjustability settings on top and also bottom. They need a oil change but should be good for replacement front forks.

              S Offline
              S Offline
              SpookDog
              wrote on last edited by
              #8

              @Mr-Shadi

              Adjustable at bottom?…

              Mr ShadiM 1 Reply Last reply
              1
              • S SpookDog

                @Mr-Shadi

                Adjustable at bottom?…

                Mr ShadiM Offline
                Mr ShadiM Offline
                Mr Shadi
                wrote on last edited by
                #9

                @SpookDog uncle said that he think its adjustable at the bottom. Actually its the screw to let oil out.

                S 1 Reply Last reply
                0
                • Mr ShadiM Mr Shadi

                  @SpookDog uncle said that he think its adjustable at the bottom. Actually its the screw to let oil out.

                  S Offline
                  S Offline
                  SpookDog
                  wrote on last edited by SpookDog
                  #10

                  @Mr-Shadi

                  Makes sense! It sounds like you may have dt200r forks? I think they had adjustable damping at the top, or maybe a valve to gas up the shocks…
                  Hopefully it’s not just a pre-load adjuster…

                  1 Reply Last reply
                  1
                  • Mr ShadiM Offline
                    Mr ShadiM Offline
                    Mr Shadi
                    wrote on last edited by
                    #11

                    Well i sadly need to do this restoration later in the authum. My friend whos warm garage i would be using backed out and nobody else i know has room so i need to wait till its warmer.

                    1 Reply Last reply
                    0
                    • CalumC Offline
                      CalumC Offline
                      Calum
                      wrote on last edited by
                      #12

                      Well, that's no excuse. Look at what @SpookDog has achieved out in the exposed elements. In the brevity of dry spells he's out there smashing a restoration!

                      Anything is possible.

                      That said, unless it really needs it, you'd probably get away with just waiting.

                      Always Originate, Never Pirate!

                      Mr ShadiM 1 Reply Last reply
                      1
                      • CalumC Calum

                        Well, that's no excuse. Look at what @SpookDog has achieved out in the exposed elements. In the brevity of dry spells he's out there smashing a restoration!

                        Anything is possible.

                        That said, unless it really needs it, you'd probably get away with just waiting.

                        Mr ShadiM Offline
                        Mr ShadiM Offline
                        Mr Shadi
                        wrote on last edited by
                        #13

                        @Calum its -25C where i am at if you have some advice how i can paint -25c weather please tell me.

                        S 1 Reply Last reply
                        0
                        • Mr ShadiM Mr Shadi

                          @Calum its -25C where i am at if you have some advice how i can paint -25c weather please tell me.

                          S Offline
                          S Offline
                          SpookDog
                          wrote on last edited by
                          #14

                          @Mr-Shadi

                          Quickly?! 😜 …

                          I’m sorry but I don’t remember where you are in the world, Eastern Europe?
                          Metal does strange things at those temperatures. You can shatter it like glass if you’re not careful. You can absolutely guarantee that a spanner will slip and you’ll skin your knuckles!…

                          Mr ShadiM 1 Reply Last reply
                          0
                          • S SpookDog

                            @Mr-Shadi

                            Quickly?! 😜 …

                            I’m sorry but I don’t remember where you are in the world, Eastern Europe?
                            Metal does strange things at those temperatures. You can shatter it like glass if you’re not careful. You can absolutely guarantee that a spanner will slip and you’ll skin your knuckles!…

                            Mr ShadiM Offline
                            Mr ShadiM Offline
                            Mr Shadi
                            wrote on last edited by
                            #15

                            @SpookDog the problem is paint wount stick at this temp. And im in estonia, next to finland.

                            S 1 Reply Last reply
                            0
                            • Mr ShadiM Mr Shadi

                              @SpookDog the problem is paint wount stick at this temp. And im in estonia, next to finland.

                              S Offline
                              S Offline
                              SpookDog
                              wrote on last edited by SpookDog
                              #16

                              @Mr-Shadi

                              Yeah, i got that. That was me being funny 🤕 …
                              It’s wet here. Fukin wet…

                              1 Reply Last reply
                              1
                              • Mr ShadiM Offline
                                Mr ShadiM Offline
                                Mr Shadi
                                wrote on last edited by
                                #17

                                Hello again.

                                Ive returned and i will start my build waay to late in to the summer.
                                Ive ordered new parts and id like to know yalls opinions
                                The parts:
                                Full Athena exhaust,
                                piston,
                                turn signals,
                                Plastics,
                                Pwk 36 carburetor,
                                Athena gaskets,
                                Bearings and bushings,
                                And a little paint.

                                Im planning to go full black on the plastics and put dark blue decals on them, also im going to paint the frame yamaha 403 dark blue.

                                Ive already upgraded my front suspention with dt 125 1980-1990 sumting motocross springs, heavier oil 15w, and put the stock spacer in my right fork. For the rear ive maxed out the shock and it rides lika dream even without the new parts yet.

                                The engine is in pretty good condition, all the gears are good but ive noticed that some bearings need to be replaced. I am very suprised that my crank is still good and not rattling beacuse ive used the bike for enduro/motocross/road usage. But my 3mb00 cylinder has a mirror finish and with my old piston has 75 psi but it still ripps and keeps up with a 2017 ktm sx 125 on full gas. Im sending the cylinder to my local shop to get it honed, then il run it with my old puston till the new parts arrive.

                                On the electrical side, everything is in meh condition. I need to rewire some parts and make some adjustments so i can put on my new turn signals. The biggest problem tha i have is that my derestrictor switch dosent work on the first try, i need to switch it for 30 seconds or so that it derestricts it and i have been thinking of putting somekind of a toggelable repeater on it so i dont have to mess with it, but i havent decided.

                                About the frame. It has some rust and dabage but mostly its all good, as a said before im thinking of spraying it with yamaha 403 dark blue paint, other than that im going to replace my swingarm bushings tomorrow, beacuse they are shot and rusted as hell.

                                For the drivetrain i bought a 15/51 sprokets so i can cruise at 90km/h in about 6000rpm and the top speed should be around 135km/h according to gearingcommander website.

                                Lastly i would like to ask, is there a way that i could increase my revs to about 11k rpm? Right now it maxxes at like 9.5k and dosent sound the best.

                                All the feedback is greatly appreciated.

                                1 Reply Last reply
                                1
                                • CalumC Offline
                                  CalumC Offline
                                  Calum
                                  wrote on last edited by
                                  #18

                                  Get yourself a Zeeltronic and it'll rev to the moon!

                                  Always Originate, Never Pirate!

                                  Mr ShadiM 1 Reply Last reply
                                  0
                                  • CalumC Calum

                                    Get yourself a Zeeltronic and it'll rev to the moon!

                                    Mr ShadiM Offline
                                    Mr ShadiM Offline
                                    Mr Shadi
                                    wrote on last edited by
                                    #19

                                    @Calum i am thinking on ignitech programmable cdi. Its about 200 euro and one of my friends used that. Is zeeltronic a little better than that? Comparably they to pretty much the same thing and can be programmed similarly, but zeeltronic is just more expensive.

                                    1 Reply Last reply
                                    0
                                    • CalumC Offline
                                      CalumC Offline
                                      Calum
                                      wrote on last edited by
                                      #20

                                      I've only used Zeeltronics on all my bikes and they've been great. I'll be picking another one up for my new project in the years to come.

                                      I've heard good things about the Ignitech system @Darty swears by them.

                                      Always Originate, Never Pirate!

                                      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