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78 GS1000 fuel seepage

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    78 GS1000 fuel seepage

    So the bike runs great. I noticed the carbs where leaking because the previous owner didn't have the screws very tight. So I finally get the carbs sealed up and now after I ride it I am getting a puddle of gas under the bike after it sits. Its coming out of the rubber hoses on the bottom side of the carbs. Any idea's? Thanks

    #2
    If you're referring to the overflow hoses attached to the bottom of the float bowl s, there's too much fuel in the float bowl
    So either: your floats are set too high, or the needle and seats are leaking
    1978 GS 1000 (since new)
    1979 GS 1000 (The Fridge, superbike replica project)
    1978 GS 1000 (parts)
    1981 GS 850 (anyone want a project?)
    1981 GPZ 550 (backroad screamer)
    1970 450 Mk IIID (THUMP!)
    2007 DRz 400S
    1999 ATK 490ES
    1994 DR 350SES

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      #3
      Yep, its coming from the overflow line.

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        #4
        ///////QUOTE
        Any idea's?
        ///////EndQUOTE


        ///////QUOTE
        So either: your floats are set too high, or the needle and seats are leaking
        //////EndQUOTE

        Or.. WHite79, maybe you are leaving petcock on PRIme position.

        THe float needles do not need to make a perfect seal-shutoff, they can leak a little. THe petcock on the tank is what is suppose to make a good seal shuttoff, but it stays open in the PRIme position.

        Also, check you oil level to see it isnt too high. If it is, that will be gas in your oil.

        Had 850G for 14 years. Now have GK since 2005.
        GK at IndyMotoGP Suzuki Display... ... GK on GSResources Page ... ... Euro Trash Ego Machine .. ..3 mo'cykls.... update 2 mocykl


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          #5
          It just randomly started dripping but its only really doing on 2 of the 4 carburetors.

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            #6
            Originally posted by White79bu View Post
            It just randomly started dripping but its only really doing on 2 of the 4 carburetors.
            Probably worth pulling them and checking float height, but if it started happening suddenly I'd agree the O-ring on the needle seat has probably given up the ghost.

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              #7
              Originally posted by nate665 View Post
              Probably worth pulling them and checking float height, but if it started happening suddenly I'd agree the O-ring on the needle seat has probably given up the ghost.
              VM carbs don't use an O-ring on the float valve body. They use a crush washer. It's the BS CV carbs that use the O-ring.
              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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                #8
                Originally posted by Nessism View Post
                VM carbs don't use an O-ring on the float valve body. They use a crush washer. It's the BS CV carbs that use the O-ring.
                Ah, thanks, only every worked on the CV carbs, didn't realize.

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                  #9
                  I would be checking your petcock first if it’s not leaking then the carbs can’t overflow unless you’ve got the floats set too high (overflowing on the tilt when on the sidestand?)
                  1980 GS1000G - Sold
                  1978 GS1000E - Finished!
                  1980 GS550E - Fixed & given to a friend
                  1983 GS750ES Special - Sold
                  2009 KLR 650 - Sold - gone to TX!
                  1982 GS1100G - Rebuilt and finished. - Sold
                  2009 TE610 - Dual Sporting around dreaming of Dakar.....

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