flooding help 78 gl1000

Discussion in 'Old's Cool' started by rdltmc3, Sep 3, 2012.

  1. rdltmc3

    rdltmc3 Adventurer

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    Aug 25, 2012
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    cleaned and set the carbs MULTIPLE times already all new rings and gaskets i even polished up the intake to try and make her happy but still the same thing. any suggetsions?

    1st video running fine with petcock off and the second is with it turned on.

    #1
  2. adiablolex

    adiablolex Lost again

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    is your fuel clean?
    I'm hunting a similar ghost in my 79 and it seems to be pointing that way
    I had the tank cleaned up before but I think some of the rusty fuzz remained so I'll have to pull it out along with the carbs....again...... :baldy
    #2
  3. DRTT

    DRTT Adventurer

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    Sounds like the float valves are sticky or worn, my money is on worn......
    good luck,
    Paddy
    #3
  4. hugemoth

    hugemoth Long timer

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    It's been a few years since I sold my 79 but I did go through the carbs. The video shows a lot of fuel in the intake box, more than would come from a stuck float needle. Gas from a stuck needle would run into the cylinder, not up into the intake box. Is there some kind of fuel passageway through the intake box that is missing an O ring?
    #4
  5. mike in idaho

    mike in idaho Been here awhile

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    Did you change the plenum gasket(big o-ring) between the two halves?
    #5
  6. dilandau

    dilandau Been here awhile

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    fuel can run into the intake box from a stuck float valve needle - did on my fz. Its going into the cylinder sure, but its getting spit back out as well.

    sometimes you just got to clean your carbs like 20 times. But yeah, take off your floats, take out the needle valves. Should have a nice clean cone on the top. Then take out the casing that holds the needle- and clean that- you got to get all the crud off the inside. Make it shine. The crud in there will keep the valve from seating.

    and of course check your float height- on my recent purchase the guy had set them like 4mm off. So don't take it on faith! Get the correct specs and set it.

    good luck. Man I just spent a week on a set of carbs- and feel your pain.

    try using pinesol
    #6
  7. Andyvh1959

    Andyvh1959 Cheesehead Klompen

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    Da frozen tundra eh? 1.5 mile west of Lambeau
    And don't froget the seals on the bottom of the fuel enrichener plungers (what some call the choke). That seal can dry out and crack, and allow raw fuel right from the float bowl into the venturi. Enough to foul a new set of plugs in 50 miles, AND contaminate the oil.

    If that seal is bad, as happened on my 78 GS1000, NO amount of jetting changes or float setting changes can compensate.
    #7
  8. hugemoth

    hugemoth Long timer

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    The old Goldwings just have choke plates rather than an enrichment circuit.
    #8
  9. Juanjo_NY

    Juanjo_NY Made in Argentina

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    check the points behind the left cylinder!
    #9
  10. bmwhacker

    bmwhacker Still on 3 wheels

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    GL 1000 mystery's! :huh
    I'm still struggling with a right side exhaust "pop"....driving me nuts.
    Changed the copper exhaust gaskets, removed / checked the "air cut-off valve, checked exhaust valve settings, performed compression test. Can't find a darned thing wrong anywhere. :cry Not sure what else to check????????????
    #10
  11. hugemoth

    hugemoth Long timer

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    Trying to remember if the petcock has a vacuum hose going to one of the right hand carbs. People often disable the vacuum petcock and sometimes forget to plug off the vacuum line.


    #11
  12. SloMo228

    SloMo228 World Class Cheapass

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    I've rebuilt a couple GL1000 carb racks. They are a pain in the ass when something goes wrong because there is a lot going on and it can be tough to pinpoint the actual cause.

    For flooding like you're talking about, the most likely causes are:

    1. Stuck floats
    2. Bad float needles
    3. Failed plenum gasket
    4. Failed floats
    5. Float height set wrong

    #1 you can check fairly easily by rapping on the side of the float bowl with a screwdriver handle. If a float is stuck, it should come loose. They get gummed up with varnish fairly easily on these carbs.

    #2 is a common problem with these carb. The float needles have a rubber coating on the tip that can wear and cause leakage. You can check by pulling the needle and inspecting it closely. If the needle is worn out, there will be a line around the tip. Replace them and you're good to go. I would definitely use OEM needles, though - there have been several reports of aftermarket needles not sealing properly even when new.

    #3 is pretty common, too. Split the plenum and inspect the gasket. Some aftermarket gaskets are susceptible to the ethanol in modern fuels and can fail prematurely. Usually they swell and block off the fuel passages in the plenum too.

    #4 happens sometimes and can cause flooding too. The floats are hollow and occasionally fail, allowing the float to fill with fuel - it's not a "float" anymore when this happens and it won't rise to close the needle valve.

    #5 would be the best case scenario since you don't have to buy anything to fix it. Use a caliper to check the float height. I don't recall the proper height off the top of my head, but it will be in the service manual.

    Those are the things I'd check first.
    #12