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DT125R FORUM

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  4. Front suspension too soft

Front suspension too soft

Scheduled Pinned Locked Moved Suspension
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  • 2 Offline
    2 Offline
    2stroketerry
    wrote on last edited by
    #1

    Hi, will putting thicker oil in my forks make much difference or will I need different forks. Now I have made my DT far quicker and need to brake far harder the front end dives down quite scarily under hard braking although being 20 stone probably doesn't help.

    1 Reply Last reply
    0
    • Glynn123G Offline
      Glynn123G Offline
      Glynn123
      wrote on last edited by
      #2

      USD fork conversion with adjustable yzf 426 forks was the best mod I ever done to my DT

      1 Reply Last reply
      0
      • F Offline
        F Offline
        finnerz89
        wrote on last edited by
        #3

        Some heavier oil will help, but a fork conversion is probably the way to go

        Current bikes:
        DT125X '07
        Street Triple R '11
        Aprilia ETV1000 '02

        Previous:
        DR650RSE '96
        FJ1200 '92

        1 Reply Last reply
        0
        • CalumC Offline
          CalumC Offline
          Calum
          wrote on last edited by
          #4

          You used to be able to get progressive springs for these bikes. Retain the OEM look. Will be worth more in the future.

          Always Originate, Never Pirate!

          declanD 1 Reply Last reply
          0
          • F Offline
            F Offline
            finnerz89
            wrote on last edited by
            #5

            I know the DTX springs are progressive, so if you found a set of them they ought to fit

            Current bikes:
            DT125X '07
            Street Triple R '11
            Aprilia ETV1000 '02

            Previous:
            DR650RSE '96
            FJ1200 '92

            1 Reply Last reply
            0
            • 2 Offline
              2 Offline
              2stroketerry
              wrote on last edited by
              #6

              Cheers lads will see if can get some progressive springs and heavier oil, changing to
              usd forks seems too much work.

              NINJAN CalumC 2 Replies Last reply
              0
              • BluestoesonnoseB Offline
                BluestoesonnoseB Offline
                Bluestoesonnose
                wrote on last edited by
                #7

                On the RD350LCs we used to run as teenagers we put mini valve springs on top of the original springs to pre load them.

                2002 DT125R

                1 Reply Last reply
                0
                • D Offline
                  D Offline
                  DTR+NSR
                  wrote on last edited by
                  #8

                  Or take the spacer tube out the standard fork, cut a piece of pvc pipe abit longer than the original and refit. Gives you more preload on the springs, so doesn't dive so much under heavy braking. And costs pennys to try first.

                  1 Reply Last reply
                  1
                  • 2 2stroketerry

                    Cheers lads will see if can get some progressive springs and heavier oil, changing to
                    usd forks seems too much work.

                    NINJAN Offline
                    NINJAN Offline
                    NINJA
                    wrote on last edited by
                    #9

                    @2stroketerry You can still get progressive springs off ebay for the DTR;

                    https://www.ebay.co.uk/itm/Yamaha-DT-125-R-96-03-RH-4BL-Wirth-Progressive-Gabelfedern/112598606935?hash=item1a37666457:g:XFIAAOSwRuFZ3kSF:rk:7:pf:0

                    Or Wemoto will order some in for ya too;

                    https://www.wemoto.com/bikes/yamaha/dt_125_r/99-00/picture/fork_springs_progressive_-_wirth_germany

                    SEDUCED BY THE DARK SIDE!!!

                    1 Reply Last reply
                    0
                    • 2 2stroketerry

                      Cheers lads will see if can get some progressive springs and heavier oil, changing to
                      usd forks seems too much work.

                      CalumC Offline
                      CalumC Offline
                      Calum
                      wrote on last edited by
                      #10

                      @2stroketerry It is a fair amount of work, and does detract away from that OEM look. But oh my what a difference it makes. Not that I do, but get a set of crosser forks and speed bumps just become fun 😄

                      Always Originate, Never Pirate!

                      Glynn123G 1 Reply Last reply
                      0
                      • CalumC Calum

                        @2stroketerry It is a fair amount of work, and does detract away from that OEM look. But oh my what a difference it makes. Not that I do, but get a set of crosser forks and speed bumps just become fun 😄

                        Glynn123G Offline
                        Glynn123G Offline
                        Glynn123
                        wrote on last edited by
                        #11

                        @Calum there is a very noticeable difference in cornering on sm wheels also, and I'm in no way an experienced road rider. Basically no dive under heavy braking also, so much more stability, not that I found my RE forks too bad.

                        CalumC 1 Reply Last reply
                        0
                        • Glynn123G Glynn123

                          @Calum there is a very noticeable difference in cornering on sm wheels also, and I'm in no way an experienced road rider. Basically no dive under heavy braking also, so much more stability, not that I found my RE forks too bad.

                          CalumC Offline
                          CalumC Offline
                          Calum
                          wrote on last edited by
                          #12

                          @Glynn123 DTR forks are though.

                          For me, I had way more fun at 30 on a DTR than I do at 70 on my SM RE. Ihad a video where I swapped with a mate and let him ride mine....I wouldn't let him have his bike back lmao!

                          Always Originate, Never Pirate!

                          1 Reply Last reply
                          0
                          • CalumC Calum

                            You used to be able to get progressive springs for these bikes. Retain the OEM look. Will be worth more in the future.

                            declanD Offline
                            declanD Offline
                            declan
                            wrote on last edited by
                            #13

                            @Calum I saw progressive springs on eBay fem months back for the dt

                            1 Reply Last reply
                            0
                            • 2 Offline
                              2 Offline
                              2stroketerry
                              wrote on last edited by
                              #14

                              Don't like look of sm wheels and do a lot of green lanes as all country side where i live and prefer to keep my knobblys although had a few scares on high speed corners. With a ported athena 170 on my dtr flat out weaves about a bit, don't know how fast though as speedo only goes to 80mph and goes faster than that. Accelerates lots faster so do a lot of heavy braking and at 20 stone the front dives crazy.

                              1 Reply Last reply
                              0
                              • stinkwheelerS Offline
                                stinkwheelerS Offline
                                stinkwheeler
                                wrote on last edited by
                                #15

                                I've just bought some preload adjusters for the top from ebay china job they do the same thing as the pvc pipe trick that and some stiffer springs is probably best but im just going to try them and see how it goes

                                The hills are alive with the sound of ... braaaap baaaaap 😁

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                                0
                                • MiniaM Offline
                                  MiniaM Offline
                                  Minia
                                  wrote on last edited by
                                  #16

                                  The suspension effect you get from forks comes from the air left inside the fork, after all you cannot compress a liquid. If you change to thicker oil and try filling it up a bit more you will effectively stiffen the forks. Just make sure you still have air in them, don't fill it right up cause then you won't have any suspension.

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

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