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    Replacing gear selector bearing

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    • Louis-DT-WR
      Louis-DT-WR last edited by

      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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      • Calum
        Calum last edited by

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

        Always Originate, Never Pirate!

        Louis-DT-WR 1 Reply Last reply Reply Quote 0
        • Louis-DT-WR
          Louis-DT-WR @Calum last edited by

          @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?

          Calum 1 Reply Last reply Reply Quote 0
          • Calum
            Calum @Louis-DT-WR last edited by

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

            Always Originate, Never Pirate!

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            • Louis-DT-WR
              Louis-DT-WR last edited by

              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

              Calum 1 Reply Last reply Reply Quote 0
              • Calum
                Calum @Louis-DT-WR last edited by

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

                Always Originate, Never Pirate!

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                • Louis-DT-WR
                  Louis-DT-WR last edited by

                  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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                  • Calum
                    Calum last edited by

                    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!

                    Louis-DT-WR 1 Reply Last reply Reply Quote 0
                    • Louis-DT-WR
                      Louis-DT-WR @Calum last edited by

                      @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

                      Calum 1 Reply Last reply Reply Quote 0
                      • Calum
                        Calum @Louis-DT-WR last edited by

                        @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!

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                        • Louis-DT-WR
                          Louis-DT-WR @Calum last edited by

                          @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.

                          Calum 1 Reply Last reply Reply Quote 0
                          • Calum
                            Calum @Louis-DT-WR last edited by

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

                            Always Originate, Never Pirate!

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