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leaking fuel/vacuum diaphram

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  • #1

    leaking fuel/vacuum diaphram

    new old guy,
    where am i going to get a fuel line diaphragm?
    I just acquired a 1979 xs11 with 25,000 miles,,
    fuel leaks out of diaphragm,,,
    thanks
    Tags: None
  • #2
    I assume you have the Special model with the fuel valve (octopus) that is mounted to the #2 carb with all the hoses. Most owners just remove it and run lines directly from the petcock's rear outlets down to the carbs. Cap the front outlets. You'll have to remember to shut off your fuel after riding though. If you really want to rebuild it.....

    http://cgi.ebay.com/ebaymotors/XS650...Q5fAccessories
    2H7 (79) owned since '89
    3H3 owned since '06

    "If it ain't broke, modify it"

    ☮

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    • #3
      Assuming your bike is a standard you can easly add an off position to your petcocks by following this method: http://www.xs11.com/forum/showthread.php?t=27221

      The biggest problem with the rebuild kits for the standard petcocks is it doesnt take them very long to fail, flooding your air box/engine. Also another member documented the piston in the diaphram is 1mm shorter than stock (somone said you can just stretch the spring behind it and problem solved?).

      By doing the above mod you can take out the old leaky diaphram toss it away and not worry about having problems with it again!Use gasket maker to seal the two halfs (where the old diaphram was), or just cut a square doughnut out of gasket material to seal it back up. The new "OFF" position will be opposite of "ON".... Wall-ah, no more leaking petcocks or flooded air box...
      Last edited by WMarshy; 03-28-2010, 11:36 AM.
      '79 XS11 F
      Stock except K&N

      '79 XS11 SF
      Stock, no title.

      '84 Chevy K-10 "Big Blue"
      GM 350, Muncie SM465, NP208, GM 10 Bolt with 3.42gears turnin 31x10.5 Baja Claws

      "What they do have is an implacable, unrelenting presence and movement that bespeaks massive power lurking behind paint and chrome. They don't wail like a screeching ninja, the don't rumble like a harley. They just growl like a spactic, stressed out badger waiting to rip your face off and eat your soul." Trainzz~RIP~

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      • #4
        I don't know why so many people recommend removing the Octy. I like it... If what you have is a Special, and you have the Octy, you can easilly rebuild it with this rebuild kit. I did, and it worked great, with no problems whatsoever.

        1980 XS850SG - Sold
        1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
        Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
        Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).

        Whether you think you can, or you think you cannot - You're right.
        -H. Ford

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        • #5
          I took mine off. I just hate battling all the gas lines whenever I need to work on it. Seems like it's hard to find a good way to route the gas lines without em kinking every time I turn around. Besides, it looks cleaner and I can turn off my gas without the octy. Just how I feel about it.
          "The Hooligan" XJ1100, Virago Gauge Pods, Screaming Eagle Mufflers, K&N Filter, hand made rear fender, side covers, and solo seat, round bar conversion, small headlight, tail light, and cat eye turn signals, chip fuses, rewired the right way.

          Pics: http://s1236.photobucket.com/user/ya...?sort=6&page=1

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          • #6
            oct

            p.m me if you are interested in a 79 spec. octy i have several i have taken off running bikes recently. they just to much pipeing involved with them, i like it simple
            79 xs 1100 spec & 80 xs 1100 g

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