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trouble with carbs on a gs850L

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    #1

    trouble with carbs on a gs850L

    this bike is a 1981 with about 22k on it for miles. i have worked really hard on getting my carbs to work right, but no sucesses. my carbs were working well when i got the bike and then gradually i felt them starting to fail. when i start the bike let it run for a bit and then shut off the bike i feel the pipes and find that one is not hot. the one that is not hot is (when looking at the bike from the front) is the second from the right. so that carb must not be working. we will call this the number two carb for clarity. this appears to be the main carb, becuase the fuel line runs into it. i have had the carbs of 5 times or more and cleaned it well every time ,soaked them a couple times overnight and still nothing. i have ran seafoam still nothing. i have put a new seat and needle in the number two carb. after i did that something funny happened. i started it for 1 min and then shut off cause the bike was not running right and found that that number two carb was the only one running. then i started it back up again and after ahile the other three started working, but then the number two stopped. it really seem like the gas is just flowing through the carb. there is gas mixing with the oil (i think just because of the huge gas flow) and also thre is white smoke, and also a little gas comming out of the exhaust. this bike has four carbs to one exhaust. i am really confused to what to do next. if anybody has some suggestions to what to do, it would be appreciated.
    if you have anymore questions about the bike just ask.
    and also if i was just to put new set of carbs on my bike, what types are compatible. (year, bike cc's etc.)

    thanks alot,

    blake
    Last edited by Guest; 12-18-2008, 11:37 PM.
    Tags: None
    #2
    Did you get a new petcock?
    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

      #3
      Originally posted by chef1366 View Post
      Did you get a new petcock?
      no i have not tried that, could that be causeing all of this mess?

      Comment

        #4
        The petcock vacuum comes from the #2 carb and when the petcock diaphram goes bad it sucks fuel through it. Is the #2 spark plug fuel fouled?
        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

          #5
          Originally posted by chef1366 View Post
          The petcock vacuum comes from the #2 carb and when the petcock diaphram goes bad it sucks fuel through it. Is the #2 spark plug fuel fouled?
          yes most of the time when i check it

          Comment

            #6
            Take off the vacuum line to the petcock and see if it has fuel in it. If so order another petcock and meanwhile run it on prime and plug the vauum hose.
            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

              #7
              Originally posted by chef1366 View Post
              Take off the vacuum line to the petcock and see if it has fuel in it. If so order another petcock and meanwhile run it on prime and plug the vauum hose.
              ill have to try that. thanks
              do you know what other carbs will work on my bike?

              Comment

                #8
                I bet your carbs are fine. Replace the petcock.
                Did you measure the float heigth when cleaning? Did you do this http://www.thegsresources.com/gs_carbrebuild.htm
                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

                  #9
                  Originally posted by chef1366 View Post
                  I bet your carbs are fine. Replace the petcock.
                  Did you measure the float heigth when cleaning? Did you do this http://www.thegsresources.com/gs_carbrebuild.htm
                  i did not check the float height. i did not use that diagram to rebuild it.

                  Comment

                    #10
                    Originally posted by stud7592 View Post
                    i did not check the float height. i did not use that diagram to rebuild it.
                    thanks chef1366 i will have to do both of these things

                    Comment

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