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DT125R FORUM

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  4. Replacing gear selector bearing

Replacing gear selector bearing

Scheduled Pinned Locked Moved Engine
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  • L Offline
    L Offline
    Louis-DT-WR
    wrote on 3 Jul 2018, 13:41 last edited by
    #1

    Hi guys, has anyone changed the sealed bearing that sits behind the gear selectors 'star'? Does the weld need removing?
    Many thanks

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    • C Online
      C Online
      Calum
      wrote on 3 Jul 2018, 13:49 last edited by
      #2

      https://dt125r.co.uk/topic/1358/aprilia-rs-125-selector-drum-rebuild-rotax-122

      Always Originate, Never Pirate!

      L 1 Reply Last reply 3 Jul 2018, 15:19
      0
      • C Calum
        3 Jul 2018, 13:49

        https://dt125r.co.uk/topic/1358/aprilia-rs-125-selector-drum-rebuild-rotax-122

        L Offline
        L Offline
        Louis-DT-WR
        wrote on 3 Jul 2018, 15:19 last edited by
        #3

        @calum thanks mate, I'll give that a try when I'm back in the UK. As far as I can remember the selector is a solid item. Have you changed one on the DT? Or just the aprillia?

        C 1 Reply Last reply 3 Jul 2018, 15:48
        0
        • L Louis-DT-WR
          3 Jul 2018, 15:19

          @calum thanks mate, I'll give that a try when I'm back in the UK. As far as I can remember the selector is a solid item. Have you changed one on the DT? Or just the aprillia?

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          C Online
          Calum
          wrote on 3 Jul 2018, 15:48 last edited by
          #4

          @louis-james Just the Aprilia. What does the exploading diagram say?

          Always Originate, Never Pirate!

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          • L Offline
            L Offline
            Louis-DT-WR
            wrote on 3 Jul 2018, 17:42 last edited by
            #5

            It's listed as one part, very stupid design if it can't be removed separately.
            Reason is I'm building a spare 200cc engine with my new 3xp cylinder

            C 1 Reply Last reply 3 Jul 2018, 17:51
            0
            • L Louis-DT-WR
              3 Jul 2018, 17:42

              It's listed as one part, very stupid design if it can't be removed separately.
              Reason is I'm building a spare 200cc engine with my new 3xp cylinder

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              Calum
              wrote on 3 Jul 2018, 17:51 last edited by
              #6

              @louis-james Oh yeah, you sure it's not journal bearing?

              Always Originate, Never Pirate!

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              • L Offline
                L Offline
                Louis-DT-WR
                wrote on 3 Jul 2018, 18:26 last edited by
                #7

                alt text
                alt text

                I've ordered all new transmission bearings from a local company but I didn't order this one as can't remove it.

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                • C Online
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                  Calum
                  wrote on 3 Jul 2018, 18:52 last edited by
                  #8

                  All coming back to me now.

                  Mate, honestly there is no load on that bearing it shouldn't wear. I only replaced mine cause the connecting rod shot through the case and the bearing was rough. But the bearing travels less than 360 degrees in any direction. But it doesn't look serviceable.

                  Always Originate, Never Pirate!

                  L 1 Reply Last reply 3 Jul 2018, 18:54
                  0
                  • C Calum
                    3 Jul 2018, 18:52

                    All coming back to me now.

                    Mate, honestly there is no load on that bearing it shouldn't wear. I only replaced mine cause the connecting rod shot through the case and the bearing was rough. But the bearing travels less than 360 degrees in any direction. But it doesn't look serviceable.

                    L Offline
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                    Louis-DT-WR
                    wrote on 3 Jul 2018, 18:54 last edited by
                    #9

                    @calum that's what I thought, might out it in a lathe to take weld off then press bearing off and reweld after new one is installed

                    C 1 Reply Last reply 3 Jul 2018, 21:15
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                    • L Louis-DT-WR
                      3 Jul 2018, 18:54

                      @calum that's what I thought, might out it in a lathe to take weld off then press bearing off and reweld after new one is installed

                      C Online
                      C Online
                      Calum
                      wrote on 3 Jul 2018, 21:15 last edited by
                      #10

                      @louis-james Has your bearing failed? I'd just get another one, given that you can get them for less than a 10er.

                      I'm not sold on the welding idea personally.

                      Always Originate, Never Pirate!

                      L 1 Reply Last reply 3 Jul 2018, 22:55
                      0
                      • C Calum
                        3 Jul 2018, 21:15

                        @louis-james Has your bearing failed? I'd just get another one, given that you can get them for less than a 10er.

                        I'm not sold on the welding idea personally.

                        L Offline
                        L Offline
                        Louis-DT-WR
                        wrote on 3 Jul 2018, 22:55 last edited by
                        #11

                        @calum not really, this "running" engine I bought has water in cases and rusted the bearings, even though this is a sealed bearing, water does get in eventually. Also so many bolts, washers and nuts were missing or incorrect size. Found a whole base gasket in the clutch cover ! Oil pump was siezed but managed to salvage the casings and a few other bits. New final drive shaft was needed so ordered one. I'll get some pictures up when cases are bored and ported then hard anodised.

                        C 1 Reply Last reply 4 Jul 2018, 06:29
                        0
                        • L Louis-DT-WR
                          3 Jul 2018, 22:55

                          @calum not really, this "running" engine I bought has water in cases and rusted the bearings, even though this is a sealed bearing, water does get in eventually. Also so many bolts, washers and nuts were missing or incorrect size. Found a whole base gasket in the clutch cover ! Oil pump was siezed but managed to salvage the casings and a few other bits. New final drive shaft was needed so ordered one. I'll get some pictures up when cases are bored and ported then hard anodised.

                          C Online
                          C Online
                          Calum
                          wrote on 4 Jul 2018, 06:29 last edited by
                          #12

                          @louis-james I take it this selector drum is different to the 125 drum.

                          Always Originate, Never Pirate!

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