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Marking its territory (with 92 octane)

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    #1

    Marking its territory (with 92 octane)

    Howdy all,

    Bikes flowing a LOT of gas out of the bottom hose of carb #1 (left most side if sitting on bike / shifter side). I was riding and stopped at a stop sign and noticed a large puddle emerging from under my bike, im not sure if the problem is only at idle or hig revs but it flows a steady stream of gas and i got my wounded bike home quickly to assess the damage(s). I just started the bike and the problem was not evident right off the bat as the bike warmed up on the choke (1700 rpm +/- 200) but when i let it idle the gas poured out again, and does not go away if I hold the bike at higher revs. I lightly tapped the float area of the carb but no changes. Is the problem in the float and that it sticks open....or...??

    Mark
    ________________

    1977 gs750
    31, XXX km
    slightly modified 8valve engine (Custom oil filler cap!!)
    old kerker exhaust
    Tags: None
    #2
    Sounds like a float to me.

    Comment

      #3
      Seems like two possibilities there. The float is sticking or the float level is set WAAY to high.

      Earl
      Komorebi-The light filtering through the trees.

      I would rather sit on a pumpkin and have it all to myself than be crowded on a velvet cushion. H.D.T.

      Comment

        #4
        If this is a float problem, wouldn't it happen when the engine is off, too (and manual petcock "on")? Does this have the horrible vacuum operated petcock? I wish I knew something about anything!

        Comment

          #5
          Could be dirt stuck in the needle valve also. if you have 2 hoses coming from the petcock it's vacuum operated, one fuel and 1 vacuum.

          Comment

            #6
            Before you take it all apart you might try to drain and refill the fuel bowl a couple of times to wash the dirt out. Just put fuel valve on prime when you want to fill the carb.

            Comment

              #7
              The float needle/seat assy has an o-ring that seals the seat to the body of the carb. This puppy might be leaking, which would bypass the float and needle valve altogether.

              Also, if this is a "hose" coming off the #1 carb as you say, it might be being caused from #2 carb instead, since this overflow hose is common between 1 and 2.

              Sound like carb work time to me...

              Roger

              Comment

                #8
                Yeah it does have the vacuum operated fuel petcock, and its flowing out the hose on the BOTTOM of the #! carb. Thanks for the help gonna get the tools out tonight and drain it and get cleaning...

                Comment

                  #9
                  Check the vent hoses. If they're crimped the gas will keep runnin', and runnin'..

                  Comment

                    #10
                    Worked like a charm, took the float bowl off while carbs still on the bike and the float was indeed stuck open. A little carefull cleaning and presto!! good riding once again. cleaned em all while i was at it. Will last for a bit im sure now. Thanks to all who replied

                    Mark
                    ________________

                    1977 gs750
                    31, XXX km
                    slightly modified 8valve engine (Custom oil filler cap!!)
                    old kerker exhaust

                    Comment

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