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DT125R FORUM

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  4. Yamaha DT125R '01 - Running Project

Yamaha DT125R '01 - Running Project

Scheduled Pinned Locked Moved DTR
portingignitech4dldtrwr200
135 Posts 27 Posters 92.8k Views 6 Watching
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  • CalumC Calum

    @Darty Yes mate that's looking the tits!

    Keep the updates rolling.

    DartyD Offline
    DartyD Offline
    Darty
    wrote on last edited by
    #59

    @Calum Cheers yo, got some real nice goodies coming soon!

    Keep it real

    1 Reply Last reply
    0
    • Biker_123B Offline
      Biker_123B Offline
      Biker_123
      wrote on last edited by
      #60

      Excellent work @Darty !! Good to see you doing more work to this beast.. Kinda worried now incase my chains been eating into my wr swing arm i will need to check tomorrow I've just been using the DTR chain slider on the wr swing arm hope its all good as I've been using the bike 24/7 lol.. Don't fancy getting rid of the capacitator by any chance now your using a battery again!? My capacitator is lost in the woods somewhere obviously wasn't secured enough 😆

      Every problem has a solution

      DartyD 1 Reply Last reply
      0
      • Biker_123B Biker_123

        Excellent work @Darty !! Good to see you doing more work to this beast.. Kinda worried now incase my chains been eating into my wr swing arm i will need to check tomorrow I've just been using the DTR chain slider on the wr swing arm hope its all good as I've been using the bike 24/7 lol.. Don't fancy getting rid of the capacitator by any chance now your using a battery again!? My capacitator is lost in the woods somewhere obviously wasn't secured enough 😆

        DartyD Offline
        DartyD Offline
        Darty
        wrote on last edited by
        #61

        @Biker_123 I've been using mine to get to work everyday, such a laugh I had it jacked up to high, like a 93cm seat height through the chain geometry out, swing-arm was too big for front sprocket clearance it's alright otherwise.

        shit man, get it bolted it under the seat xD I definitely got to hang on to my racing Capacitor, it was hand made from Greece

        Keep it real

        Biker_123B 1 Reply Last reply
        0
        • DartyD Darty

          @Biker_123 I've been using mine to get to work everyday, such a laugh I had it jacked up to high, like a 93cm seat height through the chain geometry out, swing-arm was too big for front sprocket clearance it's alright otherwise.

          shit man, get it bolted it under the seat xD I definitely got to hang on to my racing Capacitor, it was hand made from Greece

          Biker_123B Offline
          Biker_123B Offline
          Biker_123
          wrote on last edited by
          #62

          @Darty No problem haha had me worried about my swingarm for a bit there 😆.. I'll need to pick up another capacitator my local motorbike shop does them but needs to order them in so takes a while! Oh for sure it'll be getting secured better this time round 🙂

          Every problem has a solution

          1 Reply Last reply
          0
          • DartyD Offline
            DartyD Offline
            Darty
            wrote on last edited by Darty
            #63

            Yamaha DT230 Lanza - Air Duct (4TP-14437-00)

            Came all the way from Japan.

            alt text

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            Keeping a controlled Air flow. Jetted, It works well with the 125R, highly recommended. All 170cc Kits should come with a larger duct.

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            Non existent Mikuni gaskets for TM32-34. So I made my own body gaskets.

            Built a TM34 aswell to try in the future.

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            Full rebuild. A TM32 and 34 have the same bodys so I can tune with both without another custom inlet for now.

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            hmmm. Got one of my 3MB-P-00 barrels transfers cleaned and Ports re-worked and polished.

            Off to get it Ported to a Top end tune, and having my 4DL P' cylinder head and Powervalve fettled with it.

            Full chassis rebuild and paint, so maybe by next Summer, she's done. Maybe...

            Keep it real

            1 Reply Last reply
            3
            • CalumC Offline
              CalumC Offline
              Calum
              wrote on last edited by
              #64

              Looks.like some healthy upgrades now. Should free up a pony or two that's for sure!

              Always Originate, Never Pirate!

              1 Reply Last reply
              0
              • DartyD Offline
                DartyD Offline
                Darty
                wrote on last edited by Darty
                #65

                The sooner it goes back together, the sooner it can be destroyed, that is what it's all about.

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                It just doesn't fit anymore, and fried the wadding in 3 weeks.

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                RIP. DEP system.

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                The worst thing is having a Taxed and Insured Motorcycle that looks like this. Chassis needs work.

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                I can also illustrate the knarly fucking dent to the frame rail I found a few years ago.

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                WTF... How do you even?

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                That impact has twisted the down tube, its almost imperceptible, but the engine mounts tell me it's all been effected. I have seen worse before though, much worse! So still a really good base to build on.

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                Off comes the old barrel, honing marks are still there.

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                It ran perfect all of it's life. I ruined the mixture towards the end. The Powervalve was completely coked up. If you maintain these things they will see 14,000 miles on a set of rings.
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                It did heat seize once, didn't last long and never had any-more trouble.

                Found an unused WR400 headlight. What a score. Always fancied one.

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                Single bulb Enduro unit, so nothing special really.

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                WR vs RX, Not sure what I like more.
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                I found a good solution, 1987 YZ125 airboot.

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                Ready for a 34mm housing, so no more pod-filters, which are rubbish.

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                Ducati Brembo 4 pot caliper and Radial Master cylinder. Using a XT660X 320mm brake disc of my DTX hub, I will be able to sling the 4pot in there.

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                KPmotosolutions did a nice job. Ported, Port timings revised, Squish revised, crown re-machined, and powervalve revised. Tis a little beast.

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                All out for top end, It's a 134cc race tuned still to run on regular 97 octane. The Squish height is at 0.6mm. It's pretty extreme. I'm running a Wossner piston kit for some protection over detonation, Still good for a pounding, I except to blow it up.

                alt text

                The old Mitaka had created some damage before hand,

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                Mitaka vs Wossner. The quality of these forged pistons is really very good.

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                Shes going to run pretty good. I challenge a 170 kit to outperform this.

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                PowerValve clean up and modified with exhaust port.

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                Both a TZR125RR 4DL 3MB-P-00s, but one is a later Y-2 version with a Non Stamped head, which suggests it came of Belgarda TDR. It's a good baseline.

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                I've done a rough sketch of the port timings between the standard barrel and the reworked one.

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                I had the Top end blasted, and what a difference, worth doing for the money. Now I need an exhaust...

                Keep it real

                1 Reply Last reply
                3
                • CalumC Offline
                  CalumC Offline
                  Calum
                  wrote on last edited by
                  #66

                  @andrew1680 Plug and play bud

                  Always Originate, Never Pirate!

                  1 Reply Last reply
                  0
                  • DartyD Offline
                    DartyD Offline
                    Darty
                    wrote on last edited by Darty
                    #67

                    Have not touched this in months...
                    Got it Powder Coated back in January, glad it's done,

                    alt text

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                    Cleaned up all the threads, very satisfying.

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                    Pro Taper - Henry Reed bend. NOT Kevin Windham's - much to my disgust.

                    It's a shame it had to come apart.

                    Keep it real

                    1 Reply Last reply
                    3
                    • MightymanM Offline
                      MightymanM Offline
                      Mightyman
                      wrote on last edited by
                      #68

                      Bit of an odd question, but what tap and die set do you have? My cheapy one is terrible, doesn't have any of the right sizes!

                      TDR 125 - 2001

                      DartyD 1 Reply Last reply
                      0
                      • MightymanM Mightyman

                        Bit of an odd question, but what tap and die set do you have? My cheapy one is terrible, doesn't have any of the right sizes!

                        DartyD Offline
                        DartyD Offline
                        Darty
                        wrote on last edited by
                        #69

                        @Mightyman I just used 'Dormer' M6 and M8 Metric Coarse (Straight flute) taps. 1mm pitch I believe. Standard stuff, they seem good quality.

                        Keep it real

                        1 Reply Last reply
                        0
                        • Louis-DT-WRL Offline
                          Louis-DT-WRL Offline
                          Louis-DT-WR
                          wrote on last edited by
                          #70

                          Great project there, I see you trying a lot of the things I did.
                          I had a tm32 carb once upon a time, the only problem was it would overflow because the angle it sits, and if you adjust the floats, it didn't always get enough fuel.

                          Also see you're using a YZ airbox to carb boot like I did,.

                          1 Reply Last reply
                          0
                          • ZrakoZ Offline
                            ZrakoZ Offline
                            Zrako
                            wrote on last edited by
                            #71

                            What shock is that mate?

                            1979 Jawa Mustang 50
                            2003 Gilera DNA 125 R.I.P
                            2015 Keeway TX 125 SM
                            2006 Yamaha DT 125 X

                            1 Reply Last reply
                            0
                            • DartyD Offline
                              DartyD Offline
                              Darty
                              wrote on last edited by Darty
                              #72

                              @Zrako Its from a 1987' YZ490.

                              alt text

                              Minor Update bits

                              Hand sanded and Polished.

                              alt text

                              Ducati 899 Brembo Master Cylinder - 5 minutes to splice the old DTR Brake switch plug on, same coloured wires to.

                              alt text

                              Yamaha TDM900-5PS Brembo Master cylinder - Fits perfect. Frame mounts needs drilling out to M8 is all.
                              alt text

                              Thought I'd post some engine picys.

                              alt text

                              alt text

                              134cc TZR 4DL Topend - Mikuni TM32.

                              alt text

                              1987' YZ125 Airboot - The original DTR Airbox needs only simple modification.

                              alt text

                              alt text

                              @Louis-James Cheers man, I know what you mean about using any other Carb except a TMSS with an angled Venturi. I couldn't run the TM32 to start with.

                              I'll use the WR200 Inlet instead, that solves the fitment issues, I use a Reed spacer on the standard inlet and that makes it work well.

                              The WR200 Inlet helps to level out the Carb to something pretty good.

                              Keep it real

                              Louis-DT-WRL NINJAN 3 Replies Last reply
                              1
                              • DartyD Darty

                                @Zrako Its from a 1987' YZ490.

                                alt text

                                Minor Update bits

                                Hand sanded and Polished.

                                alt text

                                Ducati 899 Brembo Master Cylinder - 5 minutes to splice the old DTR Brake switch plug on, same coloured wires to.

                                alt text

                                Yamaha TDM900-5PS Brembo Master cylinder - Fits perfect. Frame mounts needs drilling out to M8 is all.
                                alt text

                                Thought I'd post some engine picys.

                                alt text

                                alt text

                                134cc TZR 4DL Topend - Mikuni TM32.

                                alt text

                                1987' YZ125 Airboot - The original DTR Airbox needs only simple modification.

                                alt text

                                alt text

                                @Louis-James Cheers man, I know what you mean about using any other Carb except a TMSS with an angled Venturi. I couldn't run the TM32 to start with.

                                I'll use the WR200 Inlet instead, that solves the fitment issues, I use a Reed spacer on the standard inlet and that makes it work well.

                                The WR200 Inlet helps to level out the Carb to something pretty good.

                                Louis-DT-WRL Offline
                                Louis-DT-WRL Offline
                                Louis-DT-WR
                                wrote on last edited by
                                #73

                                @Darty that's a good plan, I had thought of a wr200 manifold but that was before I knew you could get new parts for such old bikes haha.
                                There are a few pictures of the YZ airbox rubber Installed on my bike on the old forum somewhere

                                1 Reply Last reply
                                0
                                • DartyD Darty

                                  @Zrako Its from a 1987' YZ490.

                                  alt text

                                  Minor Update bits

                                  Hand sanded and Polished.

                                  alt text

                                  Ducati 899 Brembo Master Cylinder - 5 minutes to splice the old DTR Brake switch plug on, same coloured wires to.

                                  alt text

                                  Yamaha TDM900-5PS Brembo Master cylinder - Fits perfect. Frame mounts needs drilling out to M8 is all.
                                  alt text

                                  Thought I'd post some engine picys.

                                  alt text

                                  alt text

                                  134cc TZR 4DL Topend - Mikuni TM32.

                                  alt text

                                  1987' YZ125 Airboot - The original DTR Airbox needs only simple modification.

                                  alt text

                                  alt text

                                  @Louis-James Cheers man, I know what you mean about using any other Carb except a TMSS with an angled Venturi. I couldn't run the TM32 to start with.

                                  I'll use the WR200 Inlet instead, that solves the fitment issues, I use a Reed spacer on the standard inlet and that makes it work well.

                                  The WR200 Inlet helps to level out the Carb to something pretty good.

                                  NINJAN Offline
                                  NINJAN Offline
                                  NINJA
                                  wrote on last edited by
                                  #74

                                  @Darty Looking damn good bud!!! 👍

                                  SEDUCED BY THE DARK SIDE!!!

                                  1 Reply Last reply
                                  0
                                  • A Offline
                                    A Offline
                                    andrewj1680
                                    wrote on last edited by
                                    #75

                                    The wr200 manifold won't fit unless you cut the back off it as it's too big to fit the dt case's also the holes look to be in slightly different places

                                    1 Reply Last reply
                                    0
                                    • DartyD Darty

                                      @Zrako Its from a 1987' YZ490.

                                      alt text

                                      Minor Update bits

                                      Hand sanded and Polished.

                                      alt text

                                      Ducati 899 Brembo Master Cylinder - 5 minutes to splice the old DTR Brake switch plug on, same coloured wires to.

                                      alt text

                                      Yamaha TDM900-5PS Brembo Master cylinder - Fits perfect. Frame mounts needs drilling out to M8 is all.
                                      alt text

                                      Thought I'd post some engine picys.

                                      alt text

                                      alt text

                                      134cc TZR 4DL Topend - Mikuni TM32.

                                      alt text

                                      1987' YZ125 Airboot - The original DTR Airbox needs only simple modification.

                                      alt text

                                      alt text

                                      @Louis-James Cheers man, I know what you mean about using any other Carb except a TMSS with an angled Venturi. I couldn't run the TM32 to start with.

                                      I'll use the WR200 Inlet instead, that solves the fitment issues, I use a Reed spacer on the standard inlet and that makes it work well.

                                      The WR200 Inlet helps to level out the Carb to something pretty good.

                                      NINJAN Offline
                                      NINJAN Offline
                                      NINJA
                                      wrote on last edited by
                                      #76

                                      @Darty Did you just hand sand and hand polish the swing arm to get that result? Using fine grades all the time I suspect? Looks damn good if you did? How long did it take you to get that good of a result bud???

                                      SEDUCED BY THE DARK SIDE!!!

                                      1 Reply Last reply
                                      1
                                      • DartyD Offline
                                        DartyD Offline
                                        Darty
                                        wrote on last edited by
                                        #77

                                        @andrewj1680 I know it's not perfect, cutting stuffers off is a big compromise to inlet air speed when using the standard Reed block.

                                        So to avoid that I'm using a VFORCE Reed block, still have to modify the mounts and cut the stuffers off, but the VFORCE will take care of the inlet volume and should give much better Midrange,

                                        @CYBER-NINJA Actually I did use a Orbital sander with 120 - 400 grit because these older swingarms have huge extrusion depressions under the thick paint, it looked very clumsy before, alot of material had to come away.

                                        alt text

                                        hand sanded in between and to Wet n Dry 600-800 grit, 1200 would be too anal.

                                        Keep it real

                                        NINJAN 1 Reply Last reply
                                        0
                                        • DartyD Darty

                                          @andrewj1680 I know it's not perfect, cutting stuffers off is a big compromise to inlet air speed when using the standard Reed block.

                                          So to avoid that I'm using a VFORCE Reed block, still have to modify the mounts and cut the stuffers off, but the VFORCE will take care of the inlet volume and should give much better Midrange,

                                          @CYBER-NINJA Actually I did use a Orbital sander with 120 - 400 grit because these older swingarms have huge extrusion depressions under the thick paint, it looked very clumsy before, alot of material had to come away.

                                          alt text

                                          hand sanded in between and to Wet n Dry 600-800 grit, 1200 would be too anal.

                                          NINJAN Offline
                                          NINJAN Offline
                                          NINJA
                                          wrote on last edited by
                                          #78

                                          @Darty Came out damn good tho in the end, well worth the time and effort IMO. 👍

                                          I need to do the same on my MX, I started with some wet & dry just to test it out, TBC..................

                                          SEDUCED BY THE DARK SIDE!!!

                                          DartyD 1 Reply Last reply
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