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DT125R FORUM

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  4. Bad vibrations

Bad vibrations

Scheduled Pinned Locked Moved Engine
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  • dtlukeD Offline
    dtlukeD Offline
    dtluke
    wrote on last edited by dtluke
    #1

    Anyone ever rebuilt their engine and then had really bad vibrations at high revs?

    1 Reply Last reply
    0
    • CalumC Offline
      CalumC Offline
      Calum
      wrote on last edited by
      #2

      Sounds like you haven't time the engine up properly bud. The balancer shaft must be timed up with the crankshaft.

      It's not a split case job, but you eill have to strip the clutch basket

      Always Originate, Never Pirate!

      dtlukeD 1 Reply Last reply
      0
      • CalumC Calum

        Sounds like you haven't time the engine up properly bud. The balancer shaft must be timed up with the crankshaft.

        It's not a split case job, but you eill have to strip the clutch basket

        dtlukeD Offline
        dtlukeD Offline
        dtluke
        wrote on last edited by
        #3

        @Calum As I don't understand what you've just said this definitely sounds like my problem. Will do som research, cheers

        CalumC 1 Reply Last reply
        0
        • dtlukeD dtluke

          @Calum As I don't understand what you've just said this definitely sounds like my problem. Will do som research, cheers

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

          @dtluke Inside the gearbox next to the primary shaft and the crankshaft, that odly shaped item is the balancer shafter. It harmonically dampens the engine. It is locked into place by the crank shaft. The crank to shaft is pulled to tdc, and two dots meet at their circumference.

          If you don't, the engine will be out of nalance and will demolish the mains and gearbox.

          Always Originate, Never Pirate!

          dtlukeD 1 Reply Last reply
          1
          • CalumC Calum

            @dtluke Inside the gearbox next to the primary shaft and the crankshaft, that odly shaped item is the balancer shafter. It harmonically dampens the engine. It is locked into place by the crank shaft. The crank to shaft is pulled to tdc, and two dots meet at their circumference.

            If you don't, the engine will be out of nalance and will demolish the mains and gearbox.

            dtlukeD Offline
            dtlukeD Offline
            dtluke
            wrote on last edited by
            #5

            @Calum Cheer mate! You were spot on. Took it apart again. Lined everything up and just went out for a ride and she's better than even. first proper engine rebuild and it seems to have gone pretty well minus a few hiccups. Next one will be super smooth now.

            CalumC 1 Reply Last reply
            4
            • dtlukeD dtluke

              @Calum Cheer mate! You were spot on. Took it apart again. Lined everything up and just went out for a ride and she's better than even. first proper engine rebuild and it seems to have gone pretty well minus a few hiccups. Next one will be super smooth now.

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

              @dtluke Yeah nice man.

              Always Originate, Never Pirate!

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