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  4. 2003 Yamaha Dt125R Project

2003 Yamaha Dt125R Project

Scheduled Pinned Locked Moved DTR
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  • Walney-ReptilesW Walney-Reptiles

    Update So i have started to rebuild my Yamaha DTR 125 Engine today

    New Bearings Fitted Replaced all of them!
    New Athena Oil Seals Fitted!
    New Stainless steel allan bolts!
    Gear Box Back in one piece πŸ˜„

    Tomorrow i will be doing the Clutch and Balance shaft and all the gears that connect the Balance shaft and crank shaft together. i will also be putting my new athena barrel on then when the missing spacer washers arrive il put the head on.

    Heres some photos of todays progress in order

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    Didnt need the manual much as this will be the 10th time of rebuilding these engines πŸ˜› Super happy that im getting closer to my DTR Dream!!

    NINJAN Offline
    NINJAN Offline
    NINJA
    wrote on last edited by
    #16

    @Walney-Reptiles Shiny!!! :thumbs_up_medium-light_skin_tone: :oncoming_fist_medium-light_skin_tone: :thumbs_up_medium-light_skin_tone:

    SEDUCED BY THE DARK SIDE!!!

    1 Reply Last reply
    0
    • Walney-ReptilesW Offline
      Walney-ReptilesW Offline
      Walney-Reptiles
      wrote on last edited by
      #17

      well im very happy to say that i have now finished putting my engine back togeather im just wating on a few bits from ethena to finish puting my cylinder head on but the rest is done πŸ˜„ Heres some photos

      So upto now i have replaced with new

      Stainless bolts
      All Koyo bearings
      all Athena Oil seals
      All Athena Gaskets
      New Athena topend

      alt text

      alt text

      alt text

      alt text

      now i have all the rest of the bike to sort out,let me know what you guys think

      declanD NINJAN 2 Replies Last reply
      2
      • Walney-ReptilesW Walney-Reptiles

        well im very happy to say that i have now finished putting my engine back togeather im just wating on a few bits from ethena to finish puting my cylinder head on but the rest is done πŸ˜„ Heres some photos

        So upto now i have replaced with new

        Stainless bolts
        All Koyo bearings
        all Athena Oil seals
        All Athena Gaskets
        New Athena topend

        alt text

        alt text

        alt text

        alt text

        now i have all the rest of the bike to sort out,let me know what you guys think

        declanD Offline
        declanD Offline
        declan
        wrote on last edited by
        #18

        @Walney-Reptiles it’s so nice!

        Walney-ReptilesW 1 Reply Last reply
        0
        • Walney-ReptilesW Walney-Reptiles

          well im very happy to say that i have now finished putting my engine back togeather im just wating on a few bits from ethena to finish puting my cylinder head on but the rest is done πŸ˜„ Heres some photos

          So upto now i have replaced with new

          Stainless bolts
          All Koyo bearings
          all Athena Oil seals
          All Athena Gaskets
          New Athena topend

          alt text

          alt text

          alt text

          alt text

          now i have all the rest of the bike to sort out,let me know what you guys think

          NINJAN Offline
          NINJAN Offline
          NINJA
          wrote on last edited by
          #19

          @Walney-Reptiles Shiny!!! :thumbs_up_medium-light_skin_tone:

          SEDUCED BY THE DARK SIDE!!!

          1 Reply Last reply
          0
          • M Offline
            M Offline
            mhbikesnbits
            wrote on last edited by
            #20

            Looks very well I like it

            1 Reply Last reply
            0
            • declanD declan

              @Walney-Reptiles it’s so nice!

              Walney-ReptilesW Offline
              Walney-ReptilesW Offline
              Walney-Reptiles
              wrote on last edited by
              #21

              @declan @NINJA @mhbikesnbits

              Cheers guys! Its been a long time coming, most of the time it took me to rebuild it was waiting for parts from MSP but least i know the engine is 100% good to go, just need to get the rest of the bike going now.

              1 Reply Last reply
              0
              • CalumC Offline
                CalumC Offline
                Calum
                wrote on last edited by
                #22

                Very smart πŸ˜ƒ

                Always Originate, Never Pirate!

                1 Reply Last reply
                0
                • Walney-ReptilesW Offline
                  Walney-ReptilesW Offline
                  Walney-Reptiles
                  wrote on last edited by
                  #23

                  Hiya again folks

                  So i have some good news i have started at a garage as a welder / fabricator repairing rotten sills on vans, cars, buses etc....

                  My boss is kind enough to let me redo and weld new nuts and other work to all my parts before he sends it all off for powder coating, i have one question regarding the suspention linkage and bushes etc... I dont want to pay Β£355 for genuine yamah bearings and oil seals etc... so i want to know what size bearings i can get as a replacment instead of the standard roller bearings i wanna use ball bearings instead anyone know what size bearings i will need?

                  D 1 Reply Last reply
                  0
                  • Walney-ReptilesW Walney-Reptiles

                    Hiya again folks

                    So i have some good news i have started at a garage as a welder / fabricator repairing rotten sills on vans, cars, buses etc....

                    My boss is kind enough to let me redo and weld new nuts and other work to all my parts before he sends it all off for powder coating, i have one question regarding the suspention linkage and bushes etc... I dont want to pay Β£355 for genuine yamah bearings and oil seals etc... so i want to know what size bearings i can get as a replacment instead of the standard roller bearings i wanna use ball bearings instead anyone know what size bearings i will need?

                    D Offline
                    D Offline
                    DTR+NSR
                    wrote on last edited by
                    #24

                    I managed to get branded roller swingarm bearings for about half the price of Yamaha ones, the bearing code will be on the side of the old bearings if you still have them.

                    Walney-ReptilesW 1 Reply Last reply
                    0
                    • D DTR+NSR

                      I managed to get branded roller swingarm bearings for about half the price of Yamaha ones, the bearing code will be on the side of the old bearings if you still have them.

                      Walney-ReptilesW Offline
                      Walney-ReptilesW Offline
                      Walney-Reptiles
                      wrote on last edited by
                      #25

                      @DTR-NSR i dont have them no more there was nawt left of them anychance you may have old ones laying around to get numbers off?

                      declanD 1 Reply Last reply
                      0
                      • Walney-ReptilesW Walney-Reptiles

                        @DTR-NSR i dont have them no more there was nawt left of them anychance you may have old ones laying around to get numbers off?

                        declanD Offline
                        declanD Offline
                        declan
                        wrote on last edited by
                        #26

                        @Walney-Reptiles you need linkage stuff or swing arm stuff?

                        Walney-ReptilesW 1 Reply Last reply
                        0
                        • declanD declan

                          @Walney-Reptiles you need linkage stuff or swing arm stuff?

                          Walney-ReptilesW Offline
                          Walney-ReptilesW Offline
                          Walney-Reptiles
                          wrote on last edited by
                          #27

                          @declan I need the linkage stuff

                          1 Reply Last reply
                          0
                          • Walney-ReptilesW Offline
                            Walney-ReptilesW Offline
                            Walney-Reptiles
                            wrote on last edited by
                            #28

                            Also can someone link me to the upgrade bearings for the headset on the 2002 yamaha dtr?

                            CalumC 1 Reply Last reply
                            0
                            • Walney-ReptilesW Walney-Reptiles

                              Also can someone link me to the upgrade bearings for the headset on the 2002 yamaha dtr?

                              CalumC Offline
                              CalumC Offline
                              Calum
                              wrote on last edited by
                              #29

                              @Walney-Reptiles There are upgradable bearings?

                              Always Originate, Never Pirate!

                              Walney-ReptilesW 1 Reply Last reply
                              0
                              • CalumC Calum

                                @Walney-Reptiles There are upgradable bearings?

                                Walney-ReptilesW Offline
                                Walney-ReptilesW Offline
                                Walney-Reptiles
                                wrote on last edited by
                                #30

                                @Calum well i say that what i mean is you can change the top bearing to taper bearings instead of the standard ring bearing

                                CalumC 1 Reply Last reply
                                0
                                • Walney-ReptilesW Walney-Reptiles

                                  @Calum well i say that what i mean is you can change the top bearing to taper bearings instead of the standard ring bearing

                                  CalumC Offline
                                  CalumC Offline
                                  Calum
                                  wrote on last edited by
                                  #31

                                  @Walney-Reptiles Not without changing the the yokes/bearing cup.

                                  I done it cause I fitted USDs. But otherwise, no. Or I'm sure it could be done, but what would be the point?

                                  Always Originate, Never Pirate!

                                  D 1 Reply Last reply
                                  0
                                  • CalumC Calum

                                    @Walney-Reptiles Not without changing the the yokes/bearing cup.

                                    I done it cause I fitted USDs. But otherwise, no. Or I'm sure it could be done, but what would be the point?

                                    D Offline
                                    D Offline
                                    DTR+NSR
                                    wrote on last edited by
                                    #32

                                    @Calum my dt is fitted with tapper bearings top and bottom with out modifications, tapper bearings are able to cope with greater loads so generally last longer.

                                    CalumC 1 Reply Last reply
                                    0
                                    • D DTR+NSR

                                      @Calum my dt is fitted with tapper bearings top and bottom with out modifications, tapper bearings are able to cope with greater loads so generally last longer.

                                      CalumC Offline
                                      CalumC Offline
                                      Calum
                                      wrote on last edited by
                                      #33

                                      @DTR-NSR Cool, hit the geezer up! I didn't know it was a thing.

                                      My DT was stolen and ramped. Forks bent, wheels bent, bearings in the head tube was fine. They are robust enough. Obviously Taper has its advantages.

                                      Always Originate, Never Pirate!

                                      1 Reply Last reply
                                      0
                                      • Walney-ReptilesW Offline
                                        Walney-ReptilesW Offline
                                        Walney-Reptiles
                                        wrote on last edited by Walney-Reptiles
                                        #34

                                        Well i have made some more orders list below

                                        Head race bearings
                                        Linkage bearings and bushes
                                        Rear swing arm bearings
                                        Frunt wheel and Rear wheel bearings
                                        in total Β£186.59

                                        Heres a list with everythink i have bought since i started the project back in july including the above..

                                        Athena 125cc cylinderhead kit Β£429.95
                                        All bearings in engine (SimplyBearings.co.uk) one from pjme Β£128.09
                                        All bearings on frame and wheels (coming from ebay.co.uk) Β£186.59
                                        Athena full oilseals (from ebay.co.uk) Β£33.95
                                        Athena Full gasket set (from ebay.co.uk) Β£29.99
                                        MSP (replacment bits for inside engine that i lost) Β£45.48
                                        Sub Total Β£854.05 SO FAR

                                        I estimate there will be atleast Β£600-Β£700 more ontop left to be spent before it is complete

                                        M 1 Reply Last reply
                                        1
                                        • CalumC Offline
                                          CalumC Offline
                                          Calum
                                          wrote on last edited by
                                          #35

                                          Oh sweet bud. Sounds very expensive, but if its a job worth doing it's worth doing right.

                                          Always Originate, Never Pirate!

                                          Walney-ReptilesW 1 Reply Last reply
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