Bad vibes at 5k RPM

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  • Skyboy8950
    #1

    Bad vibes at 5k RPM

    Hey all,

    So I just got done putting everything back together after replacing my head gasket on a GS650GL. Now when I ride, I start getting some engine vibrations at 5k rpm. What could this be?

    The valve clearance on some valves is a little outta spec, but this was like that before I replaced the gasket. Also, I would have had to get all new shims and go through that (yes I know, I should have while I was there, but I figured that it was fine before...). What else could be causing this shake?

    Other than that, the bike runs like a dream. Thanks for the help!
    Tags: None
    • Guest
      #2
      After you get the valve clearance adjusted properly do a carb synchronization. Did you replace the intake o-rings?

        Comment

        • Skyboy8950
          #3
          Carbs were synched prior to head gasket replacement right after I did the carb cleaning. I also replaced the intake o-rings when I did that. I assume the carbs are still synched as I did not futz (technical term) with the adjustment on the synch.

          Should I adjust the valves myself? I think I need a special tool to get the shims out and don't know how hard it would be to adjust. Thanks!

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            • Nessism
              Forum LongTimer
              GSResource Superstar
              Past Site Supporter
              Super Site Supporter
              • Mar 2006
              • 35788
              • Torrance, CA
              #4
              Any time you take the carbs off it's a good idea to resync them.

              Valve adjustment is not difficult at all but getting the shims you need could be a pain depending on your local support network (shops that either sell or will trade shims with you).
              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

                • Odinist
                  #5
                  Weird! I was just about to post something very similar!

                  From about oh, 4,800 to about 5,500 I get a really weird vibration/sound... everything below is smooth as silk, and once I pass it, it get better.


                  Let me know if you figure anything out!

                    Comment

                    • Dave8338
                      Forum LongTimer
                      Past Site Supporter
                      • Aug 2006
                      • 11608
                      • Annandale, MN
                      #6
                      As mentioned...adjust valves, synch / resynch carbs.

                        Comment

                        • 80GS750
                          #7
                          mine vibrates too between 5 and 6.5k rpm... its smooth before and after that

                          its like a really high pitched fast vibration too.... i can feel it in the whole bike, i just figured it was normal for an engine like this to vibrate a little

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