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DT125R FORUM

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4dlhistorytuningdtr
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  • DartyD Offline
    DartyD Offline
    Darty
    wrote on last edited by Mightyman
    #26

    @Calum , beg, borrow, steal and have both! haha. What were your plans for a Swingarm swap? I drew a blank over something wide enough for RS tread.

    Got thinking about the KTM LC2 125 1991-1999?? They are elusive. European market.

    Could of bought one of these when I was 17 looking for DT's, but I didn't know what they were at the time properly and was dubious about finding parts. Should of got one though!

    That's my biggest gripe with the DT, A rubbish seat postion, height and reach if your over 6ft. I end up goon riding it and I look ridiculous. Haha such a hoot though.

    The best thing about this bike is that it is indeed a KTM chassis with much better components ie, Suspension and Geometry, They are still pretty little, but has nicer cockpit area and feels much like a early 1990s SX/EXC does.

    With a early DT125R based engine.. What a 125!

    Look familiar ?

    Not sure what size Dell'oto either. May of been 28s.

    Can't find much on these LC2 Minarelli lumps.

    Yeah and no, FMF never made pipes for this engine. I only ever gathered people mount SX/EXC aftermarket or OEM systems onto these, don't know why. Is there much benefit without a KTM barrel? Who knows, maybe the gas flow characteristics, Fluid dynamic mathematics cross over for a 3MB. Who knows.

    If you study the KTM LC2 exhaust, it's very much just a re angled' DEP expansion design.

    Interesting bike.

    http://www.domaracing.fr/shop/gb/echappements-moto-ktm-125-gl-2/132-racing-factory-exhaust-pipe-ktm-125-lc2-02-02.html

    That could be an interesting pipe to try.

    Keep it real

    1 Reply Last reply
    1
    • DartyD Offline
      DartyD Offline
      Darty
      wrote on last edited by Darty
      #27

      (FAKE) YAMAHA TZR125RR 4DL Y-2 SP Cylinder

      http://www.ebay.co.uk/itm/Yamaha-TZR-125-4DL-SP-Sport-Production-Cylinder-barrel-jug-not-RS-TZ-NSR-DT-WR-/111949294316?hash=item1a10b2aaec:g:k6YAAOSwoudW9wXC

      It's a shame,the real ones are really not just a 'straight swap' for your DT or other 4DL. Different crank,crankcase,powervalve,piston and cylinder head were used for the TZR125SP. Mega bike, the engines were really quite different to produce that magic 30+bhp.

      A custom exhaust on this would be a must. These barrels are awesome.

      Yamaha produced 500 SPs, around 150 went straight to the track and the rest were Street models. There can't be many unmolested versions left.

      Keep it real

      1 Reply Last reply
      0
      • CalumC Offline
        CalumC Offline
        Calum
        wrote on last edited by Mightyman
        #28

        Honestly, they are absolutely worthless!

        The porting is no better than this:

        http://mickabbeytuning.co.uk/Cyl4.jpg link no longer works

        http://mickabbeytuning.co.uk/Greg1.jpg link no longer works

        The only difference is these barrels are common as much. Cheap as chips. Further tunable.

        Also I think you can bolt those belgardas barrels on unless I am mistaken. Or at least you can put a 3mb on a belgarda crankcase.

        No those barrels are not worth it. It won't work unless you have the head and powervalve and I enquired about fabricating one and it's a no go.

        Nice but way too overpriced. Should be bought and displayed in a museum.

        Nice spot though

        Always Originate, Never Pirate!

        DartyD 1 Reply Last reply
        0
        • CalumC Calum

          Honestly, they are absolutely worthless!

          The porting is no better than this:

          http://mickabbeytuning.co.uk/Cyl4.jpg link no longer works

          http://mickabbeytuning.co.uk/Greg1.jpg link no longer works

          The only difference is these barrels are common as much. Cheap as chips. Further tunable.

          Also I think you can bolt those belgardas barrels on unless I am mistaken. Or at least you can put a 3mb on a belgarda crankcase.

          No those barrels are not worth it. It won't work unless you have the head and powervalve and I enquired about fabricating one and it's a no go.

          Nice but way too overpriced. Should be bought and displayed in a museum.

          Nice spot though

          DartyD Offline
          DartyD Offline
          Darty
          wrote on last edited by Darty
          #29

          @Calum Rotax engines are just better true. Have you ever ran a normal 3MB head on the 3MB-P barrel? The TZR4DL head had a different squish. I can't find one.

          SP barrel not a straight swap unfortunately

          The SP transfers are different, you could always modify a 4DL bottom end, but it's pointless without SP powervalve and crank. Not likely to find those at all. Need a complete SP engine. The 4DL-1, and 3 versions are the common lumps with standard internals and 3MB00-P top end.

          It's a shame these Yamaha 125's really don't tune very well. Cant seek power with them.

          Keep it real

          CalumC 1 Reply Last reply
          0
          • DartyD Darty

            @Calum Rotax engines are just better true. Have you ever ran a normal 3MB head on the 3MB-P barrel? The TZR4DL head had a different squish. I can't find one.

            SP barrel not a straight swap unfortunately

            The SP transfers are different, you could always modify a 4DL bottom end, but it's pointless without SP powervalve and crank. Not likely to find those at all. Need a complete SP engine. The 4DL-1, and 3 versions are the common lumps with standard internals and 3MB00-P top end.

            It's a shame these Yamaha 125's really don't tune very well. Cant seek power with them.

            CalumC Offline
            CalumC Offline
            Calum
            wrote on last edited by
            #30

            @Darty Is it though?

            I used to think like that. When I say Aprilia rs125 to people they cringe. They were highly strung motors sold to teenagers. Fair enough the original purchaser looked after it. But once it trickled down in value they got a reputation of being nothing but unreliable.

            Far from it in fact. Those bike took much more of a battering than many of bikes of its class. The only thing I will say about Aprilia are the electrics. That was their achiles heel.

            Now Yammy on the other hand. They have their rip roaring two strokes. But they were never for road use. The Yamaha TZ series was a phenomenial bike that would run rings around many other bikes. But it was a track going bike only.

            Even their Belgarda models were Italian made and not really Japanese. Nah the Japs sort power through reliabilty. As they did with most of their stuff. It isn't slow, but it isn't tear your arms out. Until you get to competition where reliability takes a bit of a dive.

            Anyway the point stands. Yamaha did their thing and we have the DT. Other manufacturers did other stuff.

            The belgarda is a gorgeous bike, but I liken it to the Aprilias and Cagivas of their day. I am told by Yamaha that even the SP barrel is Polinis work.

            Always Originate, Never Pirate!

            DartyD 1 Reply Last reply
            0
            • DartyD Darty

              Yeah they are certainly easier to make, and slightly better road race performance.

              Found this picture I took of my DT, 2 days after getting it on the road. Deep summer time in the woods, never been better.

              The rust is now an issue on my bike. Think she will be sorned off this year and boxed up.

              A full rebuild will take me a long time around studying. Got some new paint scheme ideas for it. And a special top end.

              1989 YZWR 250 , Blue on White is dope. Seriously want to design my DT around this brute.

              MiniaM Offline
              MiniaM Offline
              Minia
              wrote on last edited by
              #31

              @Darty Very nice bike and picture and I certainly like the idea of the change in colour scheme. I look quite forward to possibly seeing you get through these ambitions in the future 😉

              Yamaha DT125R Blue 2002, XT 125 1982, Yamaha WR250Z 1992, BMW GS650F 1994, Benelli BN302 2015

              DartyD 1 Reply Last reply
              0
              • CalumC Calum

                @Darty Is it though?

                I used to think like that. When I say Aprilia rs125 to people they cringe. They were highly strung motors sold to teenagers. Fair enough the original purchaser looked after it. But once it trickled down in value they got a reputation of being nothing but unreliable.

                Far from it in fact. Those bike took much more of a battering than many of bikes of its class. The only thing I will say about Aprilia are the electrics. That was their achiles heel.

                Now Yammy on the other hand. They have their rip roaring two strokes. But they were never for road use. The Yamaha TZ series was a phenomenial bike that would run rings around many other bikes. But it was a track going bike only.

                Even their Belgarda models were Italian made and not really Japanese. Nah the Japs sort power through reliabilty. As they did with most of their stuff. It isn't slow, but it isn't tear your arms out. Until you get to competition where reliability takes a bit of a dive.

                Anyway the point stands. Yamaha did their thing and we have the DT. Other manufacturers did other stuff.

                The belgarda is a gorgeous bike, but I liken it to the Aprilias and Cagivas of their day. I am told by Yamaha that even the SP barrel is Polinis work.

                DartyD Offline
                DartyD Offline
                Darty
                wrote on last edited by
                #32

                @Calum Italian electrics suck. That is very true. Had some bad times with an old CH racing WXE50.

                Aprilia's are largely trashed because there much racier, and without maintenance and mechanical sympathy they don't last. It's hard to say what is a better road bike in real terms.

                Japanese can do both, just look at the Kawasaki KDX125SR version, Best of both worlds. I'd liken our DT projects to one of those KDXs in just a De-restricted spec. They are quick. Lightweight, and Kawaka build quality not to bad.

                Yeah the Belgarda is pretty much Italian, the SP's were all assembled, and re-designed in Italy for racing.

                Keep it real

                1 Reply Last reply
                0
                • MiniaM Minia

                  @Darty Very nice bike and picture and I certainly like the idea of the change in colour scheme. I look quite forward to possibly seeing you get through these ambitions in the future 😉

                  DartyD Offline
                  DartyD Offline
                  Darty
                  wrote on last edited by
                  #33

                  @Minia Thank you 😉 I'd prefer your bike to mine. Think i'll end up with a very expensive sculpture rather than a decent everyday motorcycle.

                  Keep it real

                  1 Reply Last reply
                  0
                  • DartyD Offline
                    DartyD Offline
                    Darty
                    wrote on last edited by Darty
                    #34

                    88-89 are the ones! Not even the best. Standard trim white on Red... It's thee DT125R to have.

                    http://www.ebay.co.uk/itm/Full-Power-YAMAHA-DT125R-DT125-DT-125-R-YPVS-1989-/191861204606?hash=item2cabd1a67e:g:jkAAAOSwZAtXJiGY

                    Unfortunately the Seat is not original, the Head light decal is off an LC?

                    Keep it real

                    CalumC 1 Reply Last reply
                    1
                    • DartyD Darty

                      88-89 are the ones! Not even the best. Standard trim white on Red... It's thee DT125R to have.

                      http://www.ebay.co.uk/itm/Full-Power-YAMAHA-DT125R-DT125-DT-125-R-YPVS-1989-/191861204606?hash=item2cabd1a67e:g:jkAAAOSwZAtXJiGY

                      Unfortunately the Seat is not original, the Head light decal is off an LC?

                      CalumC Offline
                      CalumC Offline
                      Calum
                      wrote on last edited by
                      #35

                      @Darty I dunno man. There was always something about the 89 DT I just loved. I have the biggest head of anyone I know. My bike is the best this and that.

                      But hands down, my time again, it would be a 1989 dtr all over. I only have my dt because it was what was available 6 years ago lol.

                      Nice spot. Worth that price imo

                      Always Originate, Never Pirate!

                      1 Reply Last reply
                      0
                      • ConnorDTRC Offline
                        ConnorDTRC Offline
                        ConnorDTR
                        wrote on last edited by
                        #36

                        My favourite colour scheme aswell! I still need to sort some stickers on mine

                        1 Reply Last reply
                        0
                        • DartyD Offline
                          DartyD Offline
                          Darty
                          wrote on last edited by Mightyman
                          #37

                          It's a wicked Sunday, bring on the hot 2stroke. Been ogling this 1989 brochure over breakfast, Had to scan it in

                          haha have a read, veeeerry dated..

                          Keep it real

                          CalumC 1 Reply Last reply
                          1
                          • DartyD Darty

                            It's a wicked Sunday, bring on the hot 2stroke. Been ogling this 1989 brochure over breakfast, Had to scan it in

                            haha have a read, veeeerry dated..

                            CalumC Offline
                            CalumC Offline
                            Calum
                            wrote on last edited by
                            #38

                            @Darty yeah that's wicked! I mean seriously back then they must havr been the danglies!

                            Always Originate, Never Pirate!

                            DartyD 1 Reply Last reply
                            0
                            • CalumC Calum

                              @Darty yeah that's wicked! I mean seriously back then they must havr been the danglies!

                              DartyD Offline
                              DartyD Offline
                              Darty
                              wrote on last edited by
                              #39

                              @Calum Ennit! Badass if you had one of these new when you were 17. The DTR series has stood the test of time

                              Keep it real

                              1 Reply Last reply
                              0
                              • DartyD Offline
                                DartyD Offline
                                Darty
                                wrote on last edited by Darty
                                #40

                                Geekin' out, 1989-90 Yamaha DT125R (3RP1) Swiss market model

                                Was in Switzerland for a bit and I'm eyeing up a row of bikes after parking up.. as you do, when I spotted this absolute Gem. Went back the next day and found it parked up again, this time I had my camera.

                                This thing was spotless.

                                Electric' - Electric Starter model, - Was specific to just a few markets on these early models

                                Very original, this thing was tidy, Original grips and levers, chain and sprockets, Note the optional Mudguard flaps, Rear tool Kit, and the seat strap handle, hard to find stuff. Original graphics and colour scheme that I've never seen before on a 3RN1/2 model type.

                                The early 3RN1-8 models and YZs up to 1989 wear painted black calliper body's, hubs, top yokes and bars. It's a really 80s detail. Oldschool.

                                I didn't hang about, but this thing is a time capsule.

                                Keep it real

                                1 Reply Last reply
                                1
                                • CalumC Offline
                                  CalumC Offline
                                  Calum
                                  wrote on last edited by
                                  #41

                                  NIce post Darty. That is a real gem there. For me there is something special about the early dtrs. If I had my time again...

                                  Always Originate, Never Pirate!

                                  1 Reply Last reply
                                  0
                                  • DartyD Offline
                                    DartyD Offline
                                    Darty
                                    wrote on last edited by Mightyman
                                    #42

                                    Old news,

                                    Eyeing up bits of the 125R Athena Top end kit and a PDF which I had forgotten. Athena have lovingly provided a bit of information as to what their product delivers. TZR data? Hard to believe I could make that.

                                    Sorting out my 4DL-1 top end, all fresh I'm not expecting more than 22/23hp at the sprocket,

                                    Current map on the Ignitech though is giving me at least a 2hp gain over standard,

                                    Will have to see

                                    Keep it real

                                    1 Reply Last reply
                                    1
                                    • DartyD Offline
                                      DartyD Offline
                                      Darty
                                      wrote on last edited by Mightyman
                                      #43

                                      I love the early 90s, but the 1991 DT125R line up was pretty bad...

                                      Errr.

                                      You also could of bought one of these for not much more money!?

                                      Kawasaki KDX125-SR 91'- kind of a rare beast now,

                                      Way cool.

                                      Keep it real

                                      CalumC 1 Reply Last reply
                                      0
                                      • DartyD Darty

                                        I love the early 90s, but the 1991 DT125R line up was pretty bad...

                                        Errr.

                                        You also could of bought one of these for not much more money!?

                                        Kawasaki KDX125-SR 91'- kind of a rare beast now,

                                        Way cool.

                                        CalumC Offline
                                        CalumC Offline
                                        Calum
                                        wrote on last edited by
                                        #44

                                        @Darty Kawasaki developed the KIPS which was actually a whole different kettle of fish. It wasn't really like anything of its time.

                                        Always Originate, Never Pirate!

                                        1 Reply Last reply
                                        0
                                        • LJK_hunterL Offline
                                          LJK_hunterL Offline
                                          LJK_hunter
                                          wrote on last edited by
                                          #45

                                          You also could have got one of these around that time.

                                          alt text

                                          alt text

                                          They're fairly uncommon as well, have one in my garage in pretty poor condition.

                                          CalumC 1 Reply Last reply
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