Float needle / seat issue?

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  • allojohn
    Forum Sage
    Past Site Supporter
    Super Site Supporter
    • Jan 2011
    • 3515
    • NoMo, MN

    #1

    Float needle / seat issue?

    While parked I've noticed fuel drains from the hose from the petcock to the carbs over a two three day period. This isn't normal, right?

    I fear it's draining into the engine as there's nothing coming out the pods. I'm keeping an eye on the engine oil level, no noticeable difference and I've been sniffing the oil for gas, but again nothing.

    So, do I have a needle which is not seating properly?
    -Mal

    "The only reason for time is so that everything doesn't happen at once." - B. Banzai
    ___________

    78 GS750E
  • Nessism
    Forum LongTimer
    GSResource Superstar
    Past Site Supporter
    Super Site Supporter
    • Mar 2006
    • 35787
    • Torrance, CA

    #2
    It's normal for fuel to evaporate out of the float bowls. My guess is this is what's happening.
    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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    • hampshirehog
      Forum LongTimer
      Past Site Supporter
      • Oct 2007
      • 12675
      • Hampshire. UK

      #3
      Don't worry with VMs - if the carb overflows the fuel will run down the drain hoses fixed to the bottom of the float bowls.

      As for losing that tiny amount of petrol - it's either evaporation in the carbs or the float valves are letting fuel through. However, if it's the latter, again don't worry. The float valves weren't intended to hold fuel back like that, which is why the bike is fitted with a vacuum tap.
      79 GS1000S
      79 GS1000S (another one)
      80 GSX750
      80 GS550
      80 CB650 cafe racer
      75 PC50 - the one with OHV and pedals...
      75 TS100 - being ridden (suicidally) by my father

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      • allojohn
        Forum Sage
        Past Site Supporter
        Super Site Supporter
        • Jan 2011
        • 3515
        • NoMo, MN

        #4
        Originally posted by Nessism
        It's normal for fuel to evaporate out of the float bowls. My guess is this is what's happening.

        Originally posted by hampshirehog
        Don't worry with VMs - if the carb overflows the fuel will run down the drain hoses fixed to the bottom of the float bowls.

        As for losing that tiny amount of petrol - it's either evaporation in the carbs or the float valves are letting fuel through. However, if it's the latter, again don't worry. The float valves weren't intended to hold fuel back like that, which is why the bike is fitted with a vacuum tap.
        Thanks guys, set my mind at rest. Had I not had a clear hose I wouldn't have noticed and just gone about my business. Much appreciated.
        -Mal

        "The only reason for time is so that everything doesn't happen at once." - B. Banzai
        ___________

        78 GS750E

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