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DT125R FORUM

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  4. Bottom end oil seals?…

Bottom end oil seals?…

Scheduled Pinned Locked Moved Engine
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  • S Offline
    S Offline
    SpookDog
    wrote on last edited by SpookDog
    #1

    Does anyone have the size measurements of the oil seals needed for the bottom end? Or part numbers for genuine Yamaha items? I have genuine ones for the mains, so I need:

    Sprocket shaft
    Gear change shaft
    Water pump
    Kick start

    Any I’ve overlooked 🙂

    Ta for any help…

    PS: Also the size or/& part number for the primary drive/output shaft (stator side) roller/needle bearing, if anyone can help…

    S 1 Reply Last reply
    0
    • S SpookDog

      Does anyone have the size measurements of the oil seals needed for the bottom end? Or part numbers for genuine Yamaha items? I have genuine ones for the mains, so I need:

      Sprocket shaft
      Gear change shaft
      Water pump
      Kick start

      Any I’ve overlooked 🙂

      Ta for any help…

      PS: Also the size or/& part number for the primary drive/output shaft (stator side) roller/needle bearing, if anyone can help…

      S Offline
      S Offline
      SpookDog
      wrote on last edited by SpookDog
      #2

      @SpookDog

      Also, does anyone have any strong opinions about which sealant to use, or not, to join the two casings? I used Hermatite red semi hardening last time with no leaks. I’d really like to know if there’s some proper premo shit out there that I don’t know about?…

      HOTSHOT IIIH 1 Reply Last reply
      0
      • S SpookDog

        @SpookDog

        Also, does anyone have any strong opinions about which sealant to use, or not, to join the two casings? I used Hermatite red semi hardening last time with no leaks. I’d really like to know if there’s some proper premo shit out there that I don’t know about?…

        HOTSHOT IIIH Offline
        HOTSHOT IIIH Offline
        HOTSHOT III
        wrote on last edited by
        #3

        @SpookDog I used Threebond 1104 when I did my bottom end, it's no longer available but they recommend this for motorcycle crankcases in its place:

        https://threebond-europe.com/products/tb1184/

        1 Reply Last reply
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        • M Offline
          M Offline
          mhbikesnbits
          wrote on last edited by
          #4

          hylomar blue is normally my choice of Gasket Sealent

          S 1 Reply Last reply
          0
          • M mhbikesnbits

            hylomar blue is normally my choice of Gasket Sealent

            S Offline
            S Offline
            SpookDog
            wrote on last edited by
            #5

            @mhbikesnbits

            Good enough for Rolls Royce! Funny how we shy away from RTV silicon sealants. An age thing maybe? 😛 I still don’t really trust them, I know that’s stupid but I’ve taken apart engines that have had loads of excess sealant floating about in them like giant snots. Not so important in a 2T but can really spoil a 4T’s day if it gets in an oil way…

            I suppose you just have to get the bead just right?…

            CalumC M 2 Replies Last reply
            0
            • S SpookDog

              @mhbikesnbits

              Good enough for Rolls Royce! Funny how we shy away from RTV silicon sealants. An age thing maybe? 😛 I still don’t really trust them, I know that’s stupid but I’ve taken apart engines that have had loads of excess sealant floating about in them like giant snots. Not so important in a 2T but can really spoil a 4T’s day if it gets in an oil way…

              I suppose you just have to get the bead just right?…

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

              @SpookDog I never had much luck with the hylomar sealant. Hondabond and the lot are good.

              Always Originate, Never Pirate!

              1 Reply Last reply
              0
              • S SpookDog

                @mhbikesnbits

                Good enough for Rolls Royce! Funny how we shy away from RTV silicon sealants. An age thing maybe? 😛 I still don’t really trust them, I know that’s stupid but I’ve taken apart engines that have had loads of excess sealant floating about in them like giant snots. Not so important in a 2T but can really spoil a 4T’s day if it gets in an oil way…

                I suppose you just have to get the bead just right?…

                M Offline
                M Offline
                mhbikesnbits
                wrote on last edited by mhbikesnbits
                #7

                @SpookDog nice thin even layer let the solvent dry and it should always do the trick , I can imagine people putting on excessive amounts tightening the case and it spilling out in the case, I repair industrial gear boxes for work and we always use it for them too and that’s a 24/7 running gearbox and it will last years

                CalumC D 2 Replies Last reply
                1
                • M mhbikesnbits

                  @SpookDog nice thin even layer let the solvent dry and it should always do the trick , I can imagine people putting on excessive amounts tightening the case and it spilling out in the case, I repair industrial gear boxes for work and we always use it for them too and that’s a 24/7 running gearbox and it will last years

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

                  @mhbikesnbits Yeah, I can barely tie my shoe laces so it's definitely a technique thing.

                  Always Originate, Never Pirate!

                  1 Reply Last reply
                  0
                  • M mhbikesnbits

                    @SpookDog nice thin even layer let the solvent dry and it should always do the trick , I can imagine people putting on excessive amounts tightening the case and it spilling out in the case, I repair industrial gear boxes for work and we always use it for them too and that’s a 24/7 running gearbox and it will last years

                    D Offline
                    D Offline
                    DTR+NSR
                    wrote on last edited by
                    #9

                    I doubt rolls Royce were using hylomar to seal 2 stroke crankcases though. Yamabond, hondabond etc (threebond 1184) as stated in all the official workshop manuals, is the thing to use. Using anything else your just introducing another unknown. With all the issues you've had I'd be trying to illuminate unknowns.

                    S 1 Reply Last reply
                    1
                    • D DTR+NSR

                      I doubt rolls Royce were using hylomar to seal 2 stroke crankcases though. Yamabond, hondabond etc (threebond 1184) as stated in all the official workshop manuals, is the thing to use. Using anything else your just introducing another unknown. With all the issues you've had I'd be trying to illuminate unknowns.

                      S Offline
                      S Offline
                      SpookDog
                      wrote on last edited by
                      #10

                      @DTR-NSR

                      Yep, I’m definitely leaning towards the 3bond

                      1 Reply Last reply
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