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DT125R FORUM

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  4. TDR 125 19XX

TDR 125 19XX

Scheduled Pinned Locked Moved TDR
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  • MightymanM Mightyman

    Hi Paul, I did get lucky with the ad I must admit. The chap had it up for £245 on an auction and no one placed a bid! I missed it at the last minute and so messaged him offering £200 to collect and to my surprise he said yes! That's interesting that you have a 28 carb as the inlet on my engine measures around 35mm. Maybe I need to purchase another inlet if mine isn't stock.

    T Offline
    T Offline
    tdrpaul
    wrote on last edited by
    #14

    @MIGHTYMAN my inlet was damaged so I thought that's ok I'll fit a dt one, the dt manifold was to small for the dellorto carb so I enlarged derestricted and flowed it with the help of my trusty pen knife and a Dremel with a flap wheel on it.

    Automotive addiction is real HONEST😬.

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    • MightymanM Offline
      MightymanM Offline
      Mightyman
      wrote on last edited by
      #15

      I'm definitely considering just getting a stock DT carb and inlet as a Dell Orto is proving too hard / pricey to source.

      TDR 125 - 2001

      T CalumC 2 Replies Last reply
      0
      • MightymanM Mightyman

        I'm definitely considering just getting a stock DT carb and inlet as a Dell Orto is proving too hard / pricey to source.

        T Offline
        T Offline
        tdrpaul
        wrote on last edited by
        #16

        @MIGHTYMAN I found a dellorto phbh 28 for about £60 new, they use them a lot on vespas. I was thinking about using one on my 180 gilera runner fxr but I'm trying to keep it standard.
        https://www.wasp-performance.co.uk/onlineshop/prod_1875543-Carburettor-PHBH-28-BS-with-Manual-Flip-Choke-Lever.html

        I think I still have the standard jet sizes written down if you need them.

        Automotive addiction is real HONEST😬.

        CalumC 1 Reply Last reply
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        • T tdrpaul

          @MIGHTYMAN I found a dellorto phbh 28 for about £60 new, they use them a lot on vespas. I was thinking about using one on my 180 gilera runner fxr but I'm trying to keep it standard.
          https://www.wasp-performance.co.uk/onlineshop/prod_1875543-Carburettor-PHBH-28-BS-with-Manual-Flip-Choke-Lever.html

          I think I still have the standard jet sizes written down if you need them.

          CalumC Offline
          CalumC Offline
          Calum
          wrote on last edited by
          #17

          @tdrpaul The stock carb is better than those PHBH Carbs. They are a 28mm round slide carb. Flat slide is far superior.

          Always Originate, Never Pirate!

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          • CalumC Calum

            @tdrpaul The stock carb is better than those PHBH Carbs. They are a 28mm round slide carb. Flat slide is far superior.

            T Offline
            T Offline
            tdrpaul
            wrote on last edited by
            #18

            @Calum hi Calum I agree the flat slide is a lot better carb but the dellorto phbh 28 is the standard carb for the early Italian made tdr 125.
            I have a low mileage one owner 1989 tdr and I want to keep it totally original but finding original parts isn't easy.

            Paul

            Automotive addiction is real HONEST😬.

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            • MightymanM Mightyman

              I'm definitely considering just getting a stock DT carb and inlet as a Dell Orto is proving too hard / pricey to source.

              CalumC Offline
              CalumC Offline
              Calum
              wrote on last edited by
              #19

              @MIGHTYMAN or grab a mikuni tmx 32. They are common enough.

              Always Originate, Never Pirate!

              MightymanM 1 Reply Last reply
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              • CalumC Calum

                @MIGHTYMAN or grab a mikuni tmx 32. They are common enough.

                MightymanM Offline
                MightymanM Offline
                Mightyman
                wrote on last edited by
                #20

                @Calum Would I then still need a stock DT inlet for a tmx 32? Or is there a chance my current BIG inlet would be alright?

                TDR 125 - 2001

                T CalumC 2 Replies Last reply
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                • MightymanM Mightyman

                  @Calum Would I then still need a stock DT inlet for a tmx 32? Or is there a chance my current BIG inlet would be alright?

                  T Offline
                  T Offline
                  tdrpaul
                  wrote on last edited by
                  #21

                  @MIGHTYMAN the manifold in the pic is the standard manifold for the dellorto carb which has the oil pipe connection on the carb.

                  Automotive addiction is real HONEST😬.

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                  • MightymanM Mightyman

                    @Calum Would I then still need a stock DT inlet for a tmx 32? Or is there a chance my current BIG inlet would be alright?

                    CalumC Offline
                    CalumC Offline
                    Calum
                    wrote on last edited by
                    #22

                    @MIGHTYMAN Stock carb is 28mm TMX 32 is 32MM. So it should fit,.

                    Always Originate, Never Pirate!

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                    • MightymanM Offline
                      MightymanM Offline
                      Mightyman
                      wrote on last edited by Mightyman
                      #23

                      Now it's (hopefully) going to be warming up outside a bit, I thought I would get back into this project again. Last night took a look at the crankshaft to find some of the bits of piston had been lodged inside the gaps in the conrod..

                      https://youtu.be/oJv-wv8eEYQ

                      Also started the clean up job on the engine cases.

                      A bag full of steel wire rotary bits

                      Starting it off

                      https://youtu.be/9bUSrAkcnSs

                      15 mins = 1 down!

                      TDR 125 - 2001

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                      • CalumC Offline
                        CalumC Offline
                        Calum
                        wrote on last edited by
                        #24

                        Looks like that crank is going to want a rebuild.

                        I don't know how easy it is to get ahold of a new crank pin for these engines. If that crank pin is scored then you may find yourself needing to buy a new crank.

                        Always Originate, Never Pirate!

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                        • MightymanM Offline
                          MightymanM Offline
                          Mightyman
                          wrote on last edited by
                          #25

                          The crank pink should have been sheilded by the bearing I would have thought? I wasn't going to rebuild the bottom end as it all turned over very smoothly but luckily I decided to pull it all apart in the end!

                          TDR 125 - 2001

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                          • CalumC Offline
                            CalumC Offline
                            Calum
                            wrote on last edited by
                            #26

                            What bearing lol. It's a roll cage bearing so it's completely exposed.

                            If the big end bearing has got bits of piston in it then consider it thrashed.

                            For the cost of 40 quid. I would rebuild the crank. Otherwise it will fail and cost you an engine.

                            Always Originate, Never Pirate!

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                            • MightymanM Offline
                              MightymanM Offline
                              Mightyman
                              wrote on last edited by
                              #27

                              Don't worry it was going to all be rebuilt the second I opened the cases!

                              TDR 125 - 2001

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