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Won’t rev past 7000 rpm

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    #16
    Maybe the valve springs are worn out, so the valves are floating already at 7000?
    1982 GS1100G- road bike
    1990 GSX750F-(1127cc '92 GSXR engine)
    1987 Honda CBR600F Hurricane

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      #17
      The compression is fine. And valve springs don't cause problems like this. New carb diaphragms throws a red flag. Where did you get them, and how did you go about the process of changing them. Mind you, changing diaphragms is doable, but it's not an easy task.
      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

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        #18
        Just a thought that ou may have 1 pin too many between the cam chain. Ie 21 instead of 20 pins between cam marks. This would delay intake and limit rpm. Worth a check, yes happened to me and 7000 seemed to pretty much be the limit until I corrected the issue, ran flawless after that.

        V
        Gustov
        80 GS 1100 LT, 83 1100 G "Scruffy"
        81 GS 1000 G
        79 GS 850 G
        81 GS 850 L
        83 GS 550 ES, 85 GS 550 ES
        80 GS 550 L
        86 450 Rebel, 70CL 70, Yamaha TTR125
        2002 Honda 919
        2004 Ural Gear up

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          #19
          Nessism I got the diaphragms from JBM, and I also have spares from eBay. The bike was having the same issue before I replaced them. The old diaphragms were in good shape with no holes, but I must have pinched one during reassembly because the left diaphragm blew up as soon as I started the bike.
          Attached Files

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            #20
            Put your finger inside the carb throat and lift the slide up to the top of its travel, then let go. The slide should move up smoothly, then when you release, it should move down with a damped motion, and clunk as it reaches the bottom.
            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

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              #21
              Nessism Yes they both go up and come down smooth. Same as if i blow air in the port they go up smooth and come down all the way good

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                #22
                Anyone got any ideas?

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                  #23
                  I’d replace the condensers..in case they’re breaking down
                  1981 gs650L

                  "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

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                    #24
                    Check your cam chain links.
                    Gustov
                    80 GS 1100 LT, 83 1100 G "Scruffy"
                    81 GS 1000 G
                    79 GS 850 G
                    81 GS 850 L
                    83 GS 550 ES, 85 GS 550 ES
                    80 GS 550 L
                    86 450 Rebel, 70CL 70, Yamaha TTR125
                    2002 Honda 919
                    2004 Ural Gear up

                    Comment


                      #25
                      With how far you need the pilot screws out to run best.. I'd check your petcock and vacuum hose. May be losing vacuum and not supplying enough fuel.

                      Does it run fine with a remote tank and no petcock (with vacuum line plugged)?
                      - David

                      80 GS850GL
                      Arlington, TX

                      https://visitedstatesmap.com/image/ARMNMTNDSDTXsm.jpg

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