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'83 GS750 - Idles at 5000 rmp

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    #1

    '83 GS750 - Idles at 5000 rmp

    I picked up a 1983 GS750TD that had been stored for 10 years with gas in the tank.

    To get it to start, I drained all the gas from the tank and carb bowls, replaced the battery, and put in new spark plugs.

    Now it will start (yay!).

    Unfortunately, upon starting it will idle normally for about 2 seconds, then quickly ramp up to 5000 rpms, and stay there until I turn it off.


    It is at this point that I prefer to seek expert advice, as opposed to just poking around until it works better.

    Does anyone have any suggestions? I was told it ran fine before it was stored.

    Thoughts? Comments? Insults?

    Thanks
    Tags: idle
    #2
    Welcome to the site.

    First, you absolutely HAVE to take the carbs apart and clean them per the crab cleanup series linked on the main page. There are passages inside the carbs that are probably blocked, and the slides or the enrichener valves may be stuck open that could be causing your high idling problem. You also will have to get a new air filter if you haven't already done that. Get a shop manual. Clymer makes a good one for your bike. Here's one on ebay: http://cgi.ebay.com/ebaymotors/Suzuk...spagenameZWDVW



    The fact that it started at all after sitting that long without you doing anything to it is pretty amazing. Now if you want it to run right, you have to do those things (along with probably brake pads, new chain and sprockets, tires, etc...) to truly make it safe to ride on the road.
    Last edited by Griffin; 06-08-2008, 11:18 PM.
    GS450E GS650E GS700ES GS1000E GS1000G GS1100G GS1100E
    KZ550A KZ700A GPZ750
    CB400T CB900F
    XJ750R

    Comment

      #3
      Is that a sixteen valve bike?
      1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
      1985 GS1150ES stock with 85 Red E bodywork.

      Comment

        #4
        Originally posted by chef1366 View Post
        Is that a sixteen valve bike?
        Yes it is.
        GS450E GS650E GS700ES GS1000E GS1000G GS1100G GS1100E
        KZ550A KZ700A GPZ750
        CB400T CB900F
        XJ750R

        Comment

          #5
          Welcome to the site, Skaz. You'll find all the help you need here to get the bike running again.

          Be sure to check the intake boots, the rubber tubes between the carbs and head. They should be flexible and not cracked and the clamps need to be tight or you'll have a vacuum leak.

          I agree on pulling the carbs, they need to be cleaned and you should probably put new orings in them (seach the name robert barr). Follow the carb cleaning steps on this site and it really isn't that hard after you do the first one!

          Does the throttle work smoothly? Check if you can hear the throttle clicking against the adjuster when you let the throttle snap closed, could be hanging a little on one or more carbs.

          Take a look in your tank too, is it full of rust? You might want to install a fuel filter at least until you get a chance to seal the tank if it needs it.

          Good luck and welcome!

          /\/\ac

          Comment

            #6
            Originally posted by Griffin View Post
            Welcome to the site.

            First, you absolutely HAVE to take the carbs apart and clean them per the crab cleanup series linked on the main page. There are passages inside the carbs that are probably blocked, and the slides or the enrichener valves may be stuck open that could be causing your high idling problem. You also will have to get a new air filter if you haven't already done that. Get a shop manual. Clymer makes a good one for your bike. Here's one on ebay: http://cgi.ebay.com/ebaymotors/Suzuk...spagenameZWDVW



            The fact that it started at all after sitting that long without you doing anything to it is pretty amazing. Now if you want it to run right, you have to do those things (along with probably brake pads, new chain and sprockets, tires, etc...) to truly make it safe to ride on the road.
            Great post! Amen brother.[-o<
            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

              #7
              One other thing. Check the obvious first. The behavior you describe is perfectly normal for that bike if the choke is fully engaged. Make sure that if you push the choke in, the little valve bar on the front of the carb rack is actually moving and closing off the enrichening valves.

              Also, check that the idle adjustment screw on the bottom of the carb rack is backed out and not holding the carbs all the way open.
              Last edited by Griffin; 06-09-2008, 12:36 AM.
              GS450E GS650E GS700ES GS1000E GS1000G GS1100G GS1100E
              KZ550A KZ700A GPZ750
              CB400T CB900F
              XJ750R

              Comment

                #8
                Originally posted by Griffin View Post
                Welcome to the site.

                First, you absolutely HAVE to take the carbs apart and clean them per the crab cleanup series linked on the main page. There are passages inside the carbs that are probably blocked, and the slides or the enrichener valves may be stuck open that could be causing your high idling problem. You also will have to get a new air filter if you haven't already done that. Get a shop manual. Clymer makes a good one for your bike. Here's one on ebay: http://cgi.ebay.com/ebaymotors/Suzuk...spagenameZWDVW



                The fact that it started at all after sitting that long without you doing anything to it is pretty amazing. Now if you want it to run right, you have to do those things (along with probably brake pads, new chain and sprockets, tires, etc...) to truly make it safe to ride on the road.
                Woah, now BIKES can get crabs?? Sheeesh. Thats the last time I let one of those bar girls ride on *MY* bike i tell ya...hehhe

                Comment

                  #9
                  Originally posted by TheCafeKid View Post
                  Woah, now BIKES can get crabs?? Sheeesh. Thats the last time I let one of those bar girls ride on *MY* bike i tell ya...hehhe
                  It's getting late.
                  GS450E GS650E GS700ES GS1000E GS1000G GS1100G GS1100E
                  KZ550A KZ700A GPZ750
                  CB400T CB900F
                  XJ750R

                  Comment

                    #10
                    heh....luckily Crabs have not been a problem with this bike...thus far.

                    I got lucky on this bike in that it has no rust in the fuel tank, and minimal on the exterior. It starts right up and purrs like a kitten.....just a very very angry kitten.

                    I have printed off the excellent carb cleaning seminar and will be working through that over the next few days. It would make sense for that to be the issue with the color of gas I was draining out of the bike.

                    Thank you all for your help and I am looking forward to joining the GS-awesomeness club!

                    Comment

                      #11
                      yea, once you join the GS-Awesomeness club you dont go back!!!

                      Comment

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