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86 GS450L Carb Problem

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    #1

    86 GS450L Carb Problem

    So here's yet another carb post... but I'd be very thankful for any help. I just purchased an 86 GS450L that wasn't running due to the carbs. I just tore them down, cleaned and put it back together. Now the bike will start but only for 10-30 seconds before stalling. I can't give it throttle or it stalls. Sometimes it will rev high when I start it and stall immidiately afterwards. I can start it up again right away. There is also gas leaking into the air box.

    So here is what I think... floats/needle valve are either no good or out of adjustment and there is a vacuum problem somewhere in the system. The bike runs until it can't pull enough fuel anymore due to a lack of vacuum and stalls.

    Any comment or suggestions? Has anyone had a similar problem? Thanks.

    - Jason
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    #2
    Also I have specs for float height... does anyone know what the standard reference point to measure from is?

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      #3
      Have you tried running it with the petcock in the Prime position? You may have a bad diaphragm in the petcock or you are not getting enough vacuum. After a long time, I have found the best way to get my GFs GS650 started is to start it on Prime and then turn to On after it starts.

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        #4
        I tried that a little... didn't make much difference... but I'll try it longer tonight... I might take the tank back off and check out the petcock just to be sure

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          #5
          i have same problem

          i have the same exact problem with my 81 450...i took the carb off to clean it....now its a pain in the rear to get those intake gaskets back on the carb and back into the airbox and then not have a leak....look at my replies on my original post and see if there is anything there that will help....

          Comment

            #6
            wanagohueco Posted: Mon May 16, 2005 11:03 am Post subject:

            --------------------------------------------------------------------------------

            Also I have specs for float height... does anyone know what the standard reference point to measure from is?
            Measure from the gasket surface to the top of the float. Make sure all gasket material is cleaned from surface to ensure an accurate measurement.

            Good luck :mrgreen:

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              #7
              Sounds like what my GS 450 did when I started it without the vac line to the petcock connected. Man I scare myself sometimes. And to think I used to be an airplane mechanic. 8O Scary.

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                #8
                I took the petcock apart last night to see if the vacuum line was working properly. The spring steel on the diaphram was flat so I bent it out a bit... not sure if its to spec. Do you know where I can get a replacement diaphram? Everywhere I look they only sell the whole petcock and not a rebuild kit for it.

                Comment

                  #9
                  Try
                  http://www.siriusconinc.com/carb/parts.asp?category=1&id=3&supplier=2


                  SV

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                    #10
                    Sweet... thanks! I found it... but it costs $23! Might as well spend the extra $10 and get a whole new petcock... great site though... Im going to look through it for other things

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