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80 GS850 -> fuel venting from breather (Updated)

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    #1

    80 GS850 -> fuel venting from breather (Updated)

    Well, I fixed my oil leak -> loose head bolt... This thing has alot of loose bolts on it apparently (exhaust bolts were loose, one is (!!) missing, as if it rattled loose before I got it)...

    Now I have one more re-occurring issue to deal with. The oft-encountered gas-leaking from breathers issue...

    Vents out the right-side breather under normal operation.

    If I plug the right-side breather, it vents out the left side (but not as much). Engine performance suffers SEVERELY if both breathers aren't available (lean??).

    Adding choke reduces/stops the flow untill I take the choke off, then it's back..

    So, what should I look for...

    Damaged float seats?

    Float height wrong?

    Air filter issues (it's in not-so-great-shape)?

    I just detail-cleaned & re-synched the carbs, btw... Didn't replace any parts, though...

    ALSO: When I got the bike, it had no airbox, and the 'stubs' of 4 UNI-brand pod filters (eg just the boots, with the foam part ripped off)... I put the stock airbox back on, but did not change the carb jetting, as I was not sure if the previous owner had done the pods 'right' (re-jet), or just tossed them on there as if it were a car. The carbs still have the air-screws sealed in place (EPA caps), so that wasn't tinkered with...
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    #2
    You called it.... i'd check both the float height and the float needle valve and seat

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      #3
      It would be a good idea to remove the float valve and replace the sealing O ring on the float valve assembly

      Comment

        #4
        Could any of the other things affect this?

        Air filter condition?

        Jetting (eg if it was re-jetted for pods, & I stuck the airbox on without a re-re-jet)?

        Compression/valve clearance?

        I want to know before I spend $70 on a carb-rebuild-kit off E-bay...

        Comment

          #5
          Just wondering why you'd pay $70 for a carb kit.

          Comment

            #6
            Originally posted by robertbarr
            Just wondering why you'd pay $70 for a carb kit.
            Carb rebuild kit -> 4 individual carb kits (4 each, gaskets, o-rings, factory jets, needle valve assembly, $69 shipped...

            Most of the time, I see them for $17-$20 each.

            Comment

              #7
              Oh, for FOUR kits that makes sense...

              I don't see any way your problem would be anything but the carb. At that, there's only two paths for fuel flow; one way is through the inlet valve, and the other is around it, via a dead O-ring. Look over the carb cleanup series and you'll see the one I mean.

              Good luck -- that's always a problem that can tax the patience.

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