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DT125R FORUM

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  4. TDR 250 rebuild thread

TDR 250 rebuild thread

Scheduled Pinned Locked Moved TDR
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  • S SpookDog

    @oldman
    So it is a twin! For some reason I thought tdr250 was a 4/ single. I’ve never seen or heard of one of these. What year was it born? What size carbs does it run? Twin expansion chambers as well?

    CalumC Offline
    CalumC Offline
    Calum
    wrote on last edited by
    #3

    @SpookDog Yeah I don't know what I thought? Whether I thought it was a single 250. I think I thought a dual cylinder.

    Always Originate, Never Pirate!

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    • O Offline
      O Offline
      oldman
      wrote on last edited by
      #4

      Its a twin cylinder powervalve engine as used in the tzr (some models), has to be twin expansion pipes that cross each other in front of barrels. Power output standard was around 50hp, with ported barrels no idea? I'll have a good look at carbs when I get to that stage and see if they have been altered (jetting).First registered December 91 so later in production run (1988-1993). Have ordered all new seals and some new engine case bolts (bolts underneath heavily corroded, horizontally split cases), all new Yamaha parts, some on back order. Found a powdercoaters less than 5 min away from my house, reccomended by friend with the lc that featured I one of my historic posts. Dropped frame off and taking barrels and cylinder head there tomorrow for vapour blasting. As it turns out last company I used that I was less than impressed with is no longer trading, karma eh!
      http://imgur.com/gallery/UHHgzLq

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      • O Offline
        O Offline
        oldman
        wrote on last edited by
        #5

        Barrels and ylinder head dropped off for vapour blasting, pistons and powervalves cleaned. Historic damage to slave powervalve visible, looks like rings have contacted edge of powervalve sometime. Checked prior to strip down and not visible in dirty photos. Best guess is powervalve linkage from driven powervalve to slave failed at some point allowing it to rotate at will. Existing linkage fell apart when I removed heads (have received new one for rebuild)
        Did buy a new tool a few weeks ago that deserves a mention, 18v Dewalt impact wrench, should have bought one years ago!
        Powervalve cleanup https://imgur.com/gallery/LBJeRzq

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        • O Offline
          O Offline
          oldman
          wrote on last edited by
          #6

          When I bought the TDR it had the popular "upgrade" of TZR wheels, I picked up some refinished original wheels at the same time I bought the bike and stuck them in the loft. One of the reasons for the TZR wheels is the far better choice of tyres, the standard ones are 18" and 17", leaving a realistic choice of 2 brands, Bridgestone BT45 or Avon Roadriders, checked the reviews for both and Bridgestone the obvious choice .
          Have ordered the spindles and spacers to suit so all ready when needed.
          Tdr250 wheels https://imgur.com/a/ZmDZapu

          CalumC 1 Reply Last reply
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          • O oldman

            When I bought the TDR it had the popular "upgrade" of TZR wheels, I picked up some refinished original wheels at the same time I bought the bike and stuck them in the loft. One of the reasons for the TZR wheels is the far better choice of tyres, the standard ones are 18" and 17", leaving a realistic choice of 2 brands, Bridgestone BT45 or Avon Roadriders, checked the reviews for both and Bridgestone the obvious choice .
            Have ordered the spindles and spacers to suit so all ready when needed.
            Tdr250 wheels https://imgur.com/a/ZmDZapu

            CalumC Offline
            CalumC Offline
            Calum
            wrote on last edited by
            #7

            @oldman Oh smart!

            Always Originate, Never Pirate!

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            • O Offline
              O Offline
              oldman
              wrote on last edited by
              #8

              Collected my frame, barrels and cylinder head today, very happy with how well its come out. Still waiting for some parts from Fowlers for bottom end of engine on back order, did receive suitable wheel spindles from Greece with correct spacers for original wheels though. Want to get decent shock or new one in the next couple of weeks though, can lock myself in garage over the Christmas period then. Do intend on a Christmas day ride on something though, always used to do it years ago but lost the habit in recent times.
              https://imgur.com/a/dgA4UaH

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              • CalumC Offline
                CalumC Offline
                Calum
                wrote on last edited by
                #9

                Yes that looks really smart.

                Colour on the frame is lovely. Is that a genuine Yamaha colour?

                Always Originate, Never Pirate!

                O 1 Reply Last reply
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                • CalumC Calum

                  Yes that looks really smart.

                  Colour on the frame is lovely. Is that a genuine Yamaha colour?

                  O Offline
                  O Offline
                  oldman
                  wrote on last edited by
                  #10

                  @calum It's a standard powder coat colour, graphite. A shade darker but a very close match on the finish. The best recoat of a frame so far, but I did explain I wanted a premium job doing and paid a bit more to achieve what I wanted. Will be taking other parts needing refinishing soon.

                  CalumC 1 Reply Last reply
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                  • O oldman

                    @calum It's a standard powder coat colour, graphite. A shade darker but a very close match on the finish. The best recoat of a frame so far, but I did explain I wanted a premium job doing and paid a bit more to achieve what I wanted. Will be taking other parts needing refinishing soon.

                    CalumC Offline
                    CalumC Offline
                    Calum
                    wrote on last edited by
                    #11

                    @oldman Yeah it looks well smart.

                    It's like it's got a flake to it? A lovely sparkle.

                    Always Originate, Never Pirate!

                    O 1 Reply Last reply
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                    • CalumC Calum

                      @oldman Yeah it looks well smart.

                      It's like it's got a flake to it? A lovely sparkle.

                      O Offline
                      O Offline
                      oldman
                      wrote on last edited by
                      #12

                      @calum It has got a subdued metallic finish, much like the original . In the flesh it looks impressive, factory fresh. As with all powder coating the vin on frame is somewhat diminished but the TDR has a data plate that rivets to side frame tube so no moans from the mot tester hopefully

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                      • CalumC Offline
                        CalumC Offline
                        Calum
                        wrote on last edited by
                        #13

                        Yeah sure, and if they do moan, a charcoal rubbing against the frame will reveal the numbers if you are so inclined.

                        Always Originate, Never Pirate!

                        O 1 Reply Last reply
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                        • CalumC Calum

                          Yeah sure, and if they do moan, a charcoal rubbing against the frame will reveal the numbers if you are so inclined.

                          O Offline
                          O Offline
                          oldman
                          wrote on last edited by
                          #14

                          @Calum
                          Happy Christmas Calum and thanks for keeping this platform going. No update today, haven't done anything bar assemble parts, but hopefully get garage time over Christmas.
                          Let's hope 2021 will be a better year.

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