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Thread: hissing noise

  1. #1
    On the Road 110066's Avatar
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    Jan 2004
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    Milwaukee WI
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    hissing noise

    I bought a 1985 k100rs a few weeks ago and over the last few weeks I have been cleaning it up, replacing fluids, checking it over etc.

    It seems to run fine - nice and smooth - however while it is running there is a hissing sound (not a mechanical whirring)

    One of the minor things I noticed was that the airbox was missing a few of those spring clamps (which I ordered a few of)

    Could this be the source of the hiss?
    Any other ideas about where to look next if the new clamps don't solve the problem?

    thanks
    brian

  2. #2
    CustomSarge
    Guest
    I seem to mem only 4 airbox clips, missing any would open the seal to the filter. As for "hissing", I'm thinking it's air being drawn past the injector stacks' butterfies:
    1> does it go away just above idle?
    2> does it go away if you hold the airbox closed (filter in place)?
    P.S. while getting clips, get a spare or two...

  3. #3
    Rally Rat MarkF's Avatar
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    Re: hissing noise

    Originally posted by brian thompson
    I bought a 1985 k100rs a few weeks ago and over the last few weeks I have been cleaning it up, replacing fluids, checking it over etc.

    It seems to run fine - nice and smooth - however while it is running there is a hissing sound (not a mechanical whirring)
    Did you hit a snake?

    If not maybe it's your wife standing behind you.

    MarkF

  4. #4
    Registered User
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    Apr 2003
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    Brookfied WI
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    Hissing sound

    Hi Brian

    If you need some help, let me know...I live in the Brookfield.

    skohlmann1@wi.rr.com

  5. #5
    Focused kbasa's Avatar
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    Marin By God County, California
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    Re: Re: hissing noise

    Originally posted by MarkF

    If not maybe it's your wife standing behind you.

    MarkF
    But you're not bitter.....

    Dave Swider
    Marin County, CA

    Some bikes. Some with motors, some without.

  6. #6
    Rally Rat MarkF's Avatar
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    Re: Re: Re: hissing noise

    Originally posted by KBasa
    But you're not bitter.....
    Like a lemon!

    MarkF

  7. #7
    A bozo on the bus deilenberger's Avatar
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    Spring Lake NJ, USA
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    Re: hissing noise

    Originally posted by brian thompson
    I bought a 1985 k100rs a few weeks ago and over the last few weeks I have been cleaning it up, replacing fluids, checking it over etc.

    It seems to run fine - nice and smooth - however while it is running there is a hissing sound (not a mechanical whirring)

    One of the minor things I noticed was that the airbox was missing a few of those spring clamps (which I ordered a few of)

    Could this be the source of the hiss?
    Any other ideas about where to look next if the new clamps don't solve the problem?

    thanks
    brian
    Brian..

    A bit of localization of the hissing would help - like where you hear it..

    It it's near the fuel tank it may just be the normal noise of the fuel pump. If near the fuel rail - I think if you have good ears (most long-time bikers don't anymore) you might hear the fuel pressure regulator (which lives on the back of the throttle bodies).

    Also - worth checking while it's running - open the tank cap and look inside. Some of the K bikes had fuel filters that liked to split on a seam and made a hissing noise. If you have one - it will probably be visible in the gas..
    Don Eilenberger http://www.eilenberger.net
    Spring Lk Heights NJ NJ Shore BMW Riders
    '12 R1200R - I love this bike!

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