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Top end rebuilt, now revs higher!!!??!!!

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    #1

    Top end rebuilt, now revs higher!!!??!!!

    I have rebuilt the top end on a 81 GS750 DOHC. There are no leaks, I checked the timing before and after the cams were installed. I believe the choke, throttle and clutch cable are routed correctly. I also installed the exhaust and applied a silicone to help seal it.

    I am having probelms with the engine RPM's. I rode it on the highway and at 70mph the RPM's show 7k in 5th gear. This is unusually abnormal; before I tore it down it would rev around 3k RPM's at 70mph. Also it appears that its RPMS stay constant because when i downshift it stays at around 5k RPM's. The bike only idles at 1k if I hold in the clutch slightly but revs up again when I hold the clutch in all the way.

    The only thing I can think of to solve this is to lube the throttle cable.
    Does anyone know what I did wrong? has this happened to anyone else before? Any suggestions would be Gratefully appreciated.
    Tags: high rpms, top end rebuild
    #2
    could it be

    could it also be that the camshaft chain tensioner is not applying tension on the camshaft chain?

    Comment

      #3
      i would think your clutch is slipping (possibly now having to handle more power than before the rebuild)
      take a measure of the plates and the springs
      most likely the springs need replacement
      GS850GT

      Comment

        #4
        Originally posted by 81gs750L View Post

        I am having probelms with the engine RPM's. I rode it on the highway and at 70mph the RPM's show 7k in 5th gear. This is unusually abnormal; before I tore it down it would rev around 3k RPM's at 70mph. Also it appears that its RPMS stay constant because when i downshift it stays at around 5k RPM's. The bike only idles at 1k if I hold in the clutch slightly but revs up again when I hold the clutch in all the way.
        The only thing that could cause this particular oddity is some driveline anomaly. MAYBE a slipping clutch.

        The idle RPM problem could be an intake leak and/or carbs out of sync, probably both, and HAS TO BE a separate problem.
        and God said, "Let there be air compressors!"
        __________________________________________________ ______________________
        2009 Suzuki DL650 V-Strom, 2004 HondaPotamus sigpic Git'cha O-ring Kits Here!

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          #5
          3K @ 70 mph before? That seems really low, because my 80 750L was at 4.5-5K at that speed, stock chain and sprockets.

          I agree with the other posters, check the clutch.

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