Swollen float bowl gaskets
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Swollen float bowl gaskets

This is a discussion on Swollen float bowl gaskets within the Technical forums, part of the Caferacer.net Forums category; As per the title, the float bowl gaskets (they're a pre-shaped o ring, not a flat gasket) in the carb repair kits I got from ...

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  1. #1
    Senior Member hillsy's Avatar
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    Swollen float bowl gaskets

    As per the title, the float bowl gaskets (they're a pre-shaped o ring, not a flat gasket) in the carb repair kits I got from the US for the ZX11 have swelled up and I can't get them back into the grooves on the bowls.

    So far I've tried boiling them in water, putting them in the freezer, hitting them with the heat gun....and even a small zap in the microwave but they refuse to shrink back down.

    So, before I send an email to the place I got them, do any of you knowledgeable chaps know any tricks to shrink these back to size? I know I could probably run a smear of 3bond in the bowl groove and glue them in, but if there's an easier way I want to try that first.

    They have come in contact with 98 octane fuel - not ethanol (well, according to the pump it doesn't contain ethanol.....)

    These are the ones in case you are wondering WTF I'm talking about:

    http://www.ebay.com.au/itm/380361381...#ht_3720wt_951

    Thanks in advance, brains trust

  2. #2
    Member sven's Avatar
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    Sorry, I know exactly what you're talkin about as we have the same
    issue with the Mikuni TM(R)s at our Yamahas, but found that letting
    them dry in the sun was sufficient to make them fit (o.k., not really
    fit but do their job) again.
    Afaik there's always a certain amount of ethanol in pump gas (to
    dissolve water?), at least 5% here in europe.

    Best regards
    Sven

  3. #3
    Senior Member Geeto67's Avatar
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    I usually let them dry in the sun and freeze them after. It is your body heat that causes them to expand and sometimes the oil from your fingers can help lock in moisture. before I got good at them I used to put a dab of fuel proof sealant at all four corners just to hold it in place.
    Ever tried. Ever failed. No matter. Try Again. Fail again. Fail better.
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  5. #4
    Senior Member hillsy's Avatar
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    OK - thanks. I'll let them dry out over the week and see what happens. Sure makes it a lengthy process to experiment with the jetting.....

    Sven - we have ethanol % fuels over here but they are label with the content (by law), but recently we have had a few tropical cyclones destroy our major cane crops, so ethanol fuels have "disappeared" from the market for the time being.

    Cheers

  6. #5
    Senior Member crazypj's Avatar
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    wash with dish detergent, dry in the sun then put some 5w/40 full synthetic oil on them
    It 'mostly' works
    I dabble in rocket science, when I\'m not picking my nose
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    'you can take my word for it or argue until you find out I'm right'

  7. #6
    Senior Member bmartin's Avatar
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    I had the same issue with new NOS gaskets purchased from Honda. The only difference was mine would return to normal after drying out. But in the short run, it didn't make any difference as they still enlarged themselves to the point where they were completely useless as bowl gaskets. I resolved my issue but getting a set of 40 year old gaskets from my parts bin. I'm afraid you will have to source a different set of gaskets to correct this issue.
    Bob - Palmyra NY
    2 - 69 CB750, 1 Turbo
    1 - 71 CB750

  8. #7
    Senior Member hillsy's Avatar
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    Got them back in. Washed them in detergent, dried them / heated them up with the heat gun on low, then "moulded" them back into the grooves in the float bowls. Had to hold the carbs upside down (or right way up actually) to put the bowls back on without the gaskets falling out, but they're done.

  9. #8
    Senior Member bmartin's Avatar
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    I'll bet you a coffee and a cookie they will swell again as soon as you apply fuel to them.
    Bob - Palmyra NY
    2 - 69 CB750, 1 Turbo
    1 - 71 CB750

  10. #9
    Senior Member hillsy's Avatar
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    They can swell up all they like - they're wedged in the groove in the bowls and they're not coming off again.

  11. #10
    Senior Member bmartin's Avatar
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    That's what I though (cb750 carbs) - but after carefully re-setting the gaskets in the carb bowl grove they still swelled up and poked their little gasket bodies out of the carb bowls. I hope it works for you...
    Bob - Palmyra NY
    2 - 69 CB750, 1 Turbo
    1 - 71 CB750

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