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DT125R FORUM

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  4. Lapping

Lapping

Scheduled Pinned Locked Moved Top End
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  • 2 Offline
    2 Offline
    2stroketerry
    wrote on last edited by
    #7

    The O-ring conversion on a DT 125 using a 90,s YZ 125 O-ring , the tighter squish and less combustion volume really helped. On average I would say this mod gives around 1,0 a 1,5 HP. This will lower the squish from +/-1.35 to a +/-0.95mm
    0_1541544295916_DT.jpg

    CalumC 1 Reply Last reply
    1
    • 2 2stroketerry

      The O-ring conversion on a DT 125 using a 90,s YZ 125 O-ring , the tighter squish and less combustion volume really helped. On average I would say this mod gives around 1,0 a 1,5 HP. This will lower the squish from +/-1.35 to a +/-0.95mm
      0_1541544295916_DT.jpg

      CalumC Offline
      CalumC Offline
      Calum
      wrote on last edited by
      #8

      @2stroketerry That looks the tits. Who did that for you?

      Always Originate, Never Pirate!

      1 Reply Last reply
      0
      • 2 Offline
        2 Offline
        2stroketerry
        wrote on last edited by
        #9

        Cost £30 to cut the groove from a machine shop in Southbank
        0_1541546069494_DT2.jpg

        declanD 1 Reply Last reply
        0
        • 2 2stroketerry

          Cost £30 to cut the groove from a machine shop in Southbank
          0_1541546069494_DT2.jpg

          declanD Offline
          declanD Offline
          declan
          wrote on last edited by
          #10

          @2stroketerry I’m surprised you lot like the o rings I hate them with a passion I love the simple metal one like dt has I’m always having leaks and such from poorly fitted o rings even though I try my best to fit them perfectly

          CalumC 1 Reply Last reply
          0
          • declanD declan

            @2stroketerry I’m surprised you lot like the o rings I hate them with a passion I love the simple metal one like dt has I’m always having leaks and such from poorly fitted o rings even though I try my best to fit them perfectly

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

            @declan That's your problem then isn't it. Poorly fitted.

            I've not had issues with O-Ring gaskets. Usually a dab of grease to hold it in situ is enough to sort any problems out if you're having them.

            Always Originate, Never Pirate!

            declanD 1 Reply Last reply
            0
            • CalumC Calum

              @declan That's your problem then isn't it. Poorly fitted.

              I've not had issues with O-Ring gaskets. Usually a dab of grease to hold it in situ is enough to sort any problems out if you're having them.

              declanD Offline
              declanD Offline
              declan
              wrote on last edited by
              #12

              @Calum none of that worked for me they wouldn’t sit still the last one I did I used the lightest amount of super glue just enough to keep it in the groove and that worked any other time and it would always slip out an pinch the ring I should add this is on the cheap replica rs cylinders so the machining wasn’t exactly flawless

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              0
              • 2 Offline
                2 Offline
                2stroketerry
                wrote on last edited by
                #13

                @declan using glue is the last thing you want on an O-ring just a bit of silicone grease, but having a poorly machined groove the O-ring sits in probably doesn't help.
                Yamaha use an O-ring on there best 125 cylinders the SP although don't actualy make that cylinder themselves.

                declanD 1 Reply Last reply
                0
                • NINJAN Offline
                  NINJAN Offline
                  NINJA
                  wrote on last edited by NINJA
                  #14

                  I seem to remember someone once said that applying a bit of petroleum jelly, aka the good ole Vaseline works wonders for keeping your 'O' ring in good order.

                  :grinning_face_with_smiling_eyes: :winking_face: :grinning_face_with_smiling_eyes::winking_face: :grinning_face_with_smiling_eyes:

                  SEDUCED BY THE DARK SIDE!!!

                  declanD 1 Reply Last reply
                  1
                  • 2 2stroketerry

                    @declan using glue is the last thing you want on an O-ring just a bit of silicone grease, but having a poorly machined groove the O-ring sits in probably doesn't help.
                    Yamaha use an O-ring on there best 125 cylinders the SP although don't actualy make that cylinder themselves.

                    declanD Offline
                    declanD Offline
                    declan
                    wrote on last edited by
                    #15

                    @2stroketerry the only bike I didn’t have a problem with was a yz 125 that was no issues what so ever

                    1 Reply Last reply
                    0
                    • NINJAN NINJA

                      I seem to remember someone once said that applying a bit of petroleum jelly, aka the good ole Vaseline works wonders for keeping your 'O' ring in good order.

                      :grinning_face_with_smiling_eyes: :winking_face: :grinning_face_with_smiling_eyes::winking_face: :grinning_face_with_smiling_eyes:

                      declanD Offline
                      declanD Offline
                      declan
                      wrote on last edited by
                      #16

                      @NINJA you’d know

                      NINJAN 1 Reply Last reply
                      0
                      • declanD declan

                        @NINJA you’d know

                        NINJAN Offline
                        NINJAN Offline
                        NINJA
                        wrote on last edited by
                        #17

                        @declan Do not tell me that you did not laugh at that one???

                        SEDUCED BY THE DARK SIDE!!!

                        declanD 1 Reply Last reply
                        0
                        • NINJAN NINJA

                          @declan Do not tell me that you did not laugh at that one???

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

                          @NINJA sorry to say I didn’t i take my o rings very seriously I’m quite anal about o rings

                          1 Reply Last reply
                          1
                          • CalumC Offline
                            CalumC Offline
                            Calum
                            wrote on last edited by
                            #19

                            Like with most things, the work is in the preparation.

                            Always Originate, Never Pirate!

                            1 Reply Last reply
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