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Cam Chain Tensioner Knob fell off

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    Cam Chain Tensioner Knob fell off

    Last night I pulled my 83 out into the driveway and started it.

    Rode down the drive and back and on the return I heard a strange sound that was related to rpm.

    Shut of the engine and got off to find the knob from the Cam Chain Tensioner laying on the engine block .. loose .

    The engine was running before I stopped but I did notice it backfired (which I had never noticed it do before).


    What have I done to my poor bike ?

    #2
    Worst case is bent valves...but lets not assume the worst.

    Sounds like time to remove the tensioner and inspect all the parts. New seals are always a good idea but not manditory if the tensioner was not leaking. Bwinger has a tutorial on how to rebuild the tensioner, link available on Basscliff's site. Once you get it back together, I'd check the cam timing to make sure it didn't skip. It wouldn't hurt to turn the engine to 1-4 TDC before removing the tensioner and check timing straight away. Just be careful to not turn the engine over if you feel resistance.

    Good luck and hope nothing serious happened.
    Ed

    To measure is to know.

    Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

    Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

    Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

    KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

    Comment


      #3
      OK .. that is good to hear.

      I will post up more questions I'm sure.

      Thanks Ed

      Originally posted by Nessism View Post
      Worst case is bent valves...but lets not assume the worst.

      Sounds like time to remove the tensioner and inspect all the parts. New seals are always a good idea but not manditory if the tensioner was not leaking. Bwinger has a tutorial on how to rebuild the tensioner, link available on Basscliff's site. Once you get it back together, I'd check the cam timing to make sure it didn't skip. It wouldn't hurt to turn the engine to 1-4 TDC before removing the tensioner and check timing straight away. Just be careful to not turn the engine over if you feel resistance.

      Good luck and hope nothing serious happened.

      Comment


        #4
        If you have ever screwed with one, you will realize that the automatic operation and hard riding are not really compatiable. I have replaced both my GS750 and GS1100 tensioner with manual models. $55 from APE. You just adjust the chain whenever you adjust valves.

        Comment


          #5
          Chances are your motor is fine because of the way the tensioner works and, like Ed says, worst case is bent valves.

          Definitely worth checking the timing.
          79 GS1000S
          79 GS1000S (another one)
          80 GSX750
          80 GS550
          80 CB650 cafe racer
          75 PC50 - the one with OHV and pedals...
          75 TS100 - being ridden (suicidally) by my father

          Comment


            #6
            Please tell me more about automatic operation and hard riding not being compatible.

            Originally posted by posplayr View Post
            If you have ever screwed with one, you will realize that the automatic operation and hard riding are not really compatiable. I have replaced both my GS750 and GS1100 tensioner with manual models. $55 from APE. You just adjust the chain whenever you adjust valves.

            Comment


              #7
              Unless you are taking your bike to the drag strip and running sustained high rpms, the stock tensioner should be fine.
              Ed

              To measure is to know.

              Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

              Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

              Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

              KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

              Comment


                #8
                Originally posted by mriddle View Post
                Please tell me more about automatic operation and hard riding not being compatible.
                I've used stock tensioners on all of my GSes, never babied any of them, never had an issue.

                They all see red line quite often, the smaller bikes more often. These have all been stock engines.

                Track bikes and drag racing bikes with high performance, higher revving engines
                need more, ask an engine expert.
                http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                Life is too short to ride an L.

                Comment

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