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DT125R FORUM

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  4. rattle sound

rattle sound

Scheduled Pinned Locked Moved Engine
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  • declanD declan

    @calum and always check handle bars for hair line cracks 😅😅

    Irongamer727I Offline
    Irongamer727I Offline
    Irongamer727
    wrote on last edited by
    #15
    This post is deleted!
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    • Irongamer727I Offline
      Irongamer727I Offline
      Irongamer727
      wrote on last edited by
      #16

      How big is the chance that a dt engine with 24000 km on it has failed connecting rod bearings? Anyone experienced that?

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      • NottsbikerN Offline
        NottsbikerN Offline
        Nottsbiker
        wrote on last edited by
        #17

        Entirely possible

        Depends on use and abuse tbh

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        • Irongamer727I Offline
          Irongamer727I Offline
          Irongamer727
          wrote on last edited by
          #18

          Does that sound have any similarity with that?

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          • NottsbikerN Offline
            NottsbikerN Offline
            Nottsbiker
            wrote on last edited by
            #19

            Sorry I'm on holiday in France at moment miles from any wifi 😉

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            • Irongamer727I Offline
              Irongamer727I Offline
              Irongamer727
              wrote on last edited by
              #20

              Spoke to a yamaha dealer today. He said not to worry and that it most likely is the powervalve vibrating a bit.

              A 1 Reply Last reply
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              • Irongamer727I Irongamer727

                Spoke to a yamaha dealer today. He said not to worry and that it most likely is the powervalve vibrating a bit.

                A Offline
                A Offline
                andrewj1680
                wrote on last edited by
                #21

                @irongamer727 that is something abit more than the powervalve vibrating I'm sure I'd look into that abit more if I were you, could end up costing you a complete rebuild if it goes

                Irongamer727I 1 Reply Last reply
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                • A andrewj1680

                  @irongamer727 that is something abit more than the powervalve vibrating I'm sure I'd look into that abit more if I were you, could end up costing you a complete rebuild if it goes

                  Irongamer727I Offline
                  Irongamer727I Offline
                  Irongamer727
                  wrote on last edited by
                  #22

                  @andrewj1680 sounds a bit different in reality. But he has been sounding like this a looong time now. Pretty sure it's the powervalve. It's just open and might be shaking a bit.

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                  • NottsbikerN Offline
                    NottsbikerN Offline
                    Nottsbiker
                    wrote on last edited by
                    #23

                    Could it be an air leak at the power valve making a sound like a rattle? I've heard different types of pv clattering on a closed throttle but I'm not certain I'd like to ride around with a random rattle without at least figuring out what's the cause.

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                    • A Offline
                      A Offline
                      andrewj1680
                      wrote on last edited by
                      #24

                      For the sake of £20 on gaskets and 30mins work I would pull the top end off could be little or nothing but atleast you know. I'd cringe riding around sounding like that I'd be constantly waiting for it to go bang

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                      • Irongamer727I Offline
                        Irongamer727I Offline
                        Irongamer727
                        wrote on last edited by
                        #25

                        Yesterday I finally took the top end apart. Piston, rings, rod looked perfect! The only probable culprit according to me was the needle bearing. It felt like a "marraccas". Could that have been causing the rattle? The piston and ring gap was not excessive what so ever..
                        The pv that was supposed to be jammed shut was not "correctly" jammed. It might have caused some rattle sound. But other than that I am clueless.

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                        • Irongamer727I Offline
                          Irongamer727I Offline
                          Irongamer727
                          wrote on last edited by
                          #26

                          Anyone??

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                          • CalumC Offline
                            CalumC Offline
                            Calum
                            wrote on last edited by
                            #27

                            Little end rattle is a common noise to be heard from the top end when a little end bearing is reused and or damaged.

                            Continual use of a worn bearing will eventually wear out the connect rod, resulting in a rebuild of the crank.

                            The powervalve can rattle too, if it's not secured properly by the bushes, either worn or the like.

                            But ultimately, two strokes are rattly by nature, be sure you're not just being paranoid.

                            Always Originate, Never Pirate!

                            Irongamer727I 1 Reply Last reply
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                            • CalumC Calum

                              Little end rattle is a common noise to be heard from the top end when a little end bearing is reused and or damaged.

                              Continual use of a worn bearing will eventually wear out the connect rod, resulting in a rebuild of the crank.

                              The powervalve can rattle too, if it's not secured properly by the bushes, either worn or the like.

                              But ultimately, two strokes are rattly by nature, be sure you're not just being paranoid.

                              Irongamer727I Offline
                              Irongamer727I Offline
                              Irongamer727
                              wrote on last edited by
                              #28

                              @calum thanks! What can I look for on the old small end? In order to diagnose whether it was the problem or not.

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                              • CalumC Offline
                                CalumC Offline
                                Calum
                                wrote on last edited by
                                #29

                                Distinct blueing of the small eye or bearing. Lose needles or other wise damage. I think a new small end bearing is like £5 so it's no hardship to simply replace if in doubt

                                Always Originate, Never Pirate!

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