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DT125R FORUM

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Lapping

Scheduled Pinned Locked Moved Top End
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  • BluestoesonnoseB Bluestoesonnose

    LC motors are alloy and it seems to be a wide spread practice with the aircooled and watercool boys back in the heydays.

    CalumC Offline
    CalumC Offline
    Calum
    wrote on last edited by
    #4

    @Bluestoesonnose I know LC motors are alloy, I was specifically referring to the AC motors since I'd expect this to be where it would work reliably.

    But I've not heard anyone do it to DT's. I guess there must be a reason why it's not so common these days.

    Always Originate, Never Pirate!

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    • BluestoesonnoseB Offline
      BluestoesonnoseB Offline
      Bluestoesonnose
      wrote on last edited by
      #5

      Not totally clear in your reply

      2002 DT125R

      CalumC 1 Reply Last reply
      0
      • BluestoesonnoseB Bluestoesonnose

        Not totally clear in your reply

        CalumC Offline
        CalumC Offline
        Calum
        wrote on last edited by
        #6

        @Bluestoesonnose I'm not saying it's not possible, I do question it's reliability. O-Ring modification would probably be your best bet. But the discussed factors should be considered.

        Always Originate, Never Pirate!

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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!

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            • 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
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              • 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
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                • 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
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                  • 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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                    • 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

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                          • 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!

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