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Thread: Air loss noise from throttle body area

  1. #1
    Junior Member
    Join Date
    Apr 2009
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    9
    2007 XB12STT - 8000miles (purchased new in the crate June 2009)
    AMSOIL 20W-50 Motorcycle Oil

    Recently I began to hear a funny noise from the top end of the XB. It sounds a lot like a loud sucking noise, maybe even some kind of vacuum leak. The bike will idle just fine for a while, then a stumble occurs, then shortly thereafter it will die. If I blip the throttle a bit the bike runs fine. Any idea where the noise could be originating from?

    BTW, the oil level is good, primary is adjusted properly, and all electrical connections visually look good. Only strange thing is this sucking noise that suddenly began.

    I have not checked the headers and cylinder heads for tightness, although with just a visual check I do not notice anything loose or in bad condition. No oil leaks, drips, runs or anything strange.

  2. #2
    Senior Member
    Join Date
    May 2008
    Posts
    6,470
    You can download the manual, and do throttle body leak test. That would be the easiest

  3. #3
    Senior Member
    Join Date
    Apr 2009
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    179
    California bike?

  4. #4
    Junior Member
    Join Date
    Apr 2009
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    9
    yeah its a california bike

  5. #5
    Junior Member
    Join Date
    Apr 2009
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    9
    evap hose?

  6. #6
    Junior Member
    Join Date
    Apr 2009
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    9
    just checked the throttle body. the evap hose is connected and there are no problems with it running towards the canister. i removed the air scoops from each side and it sounds like the leak is from the throttle body/head seals. goin to try to tighten it a bit and see if there is any improvement. it's a tight fit because of the frame spars, but an allen key could fit in there.

  7. #7
    Junior Member
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    Apr 2009
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    9
    ttt

  8. #8
    Senior Member
    Join Date
    Aug 2008
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    5,146
    Might spray starter fluid around your intake manifold while the bike is running - if your RPM's bump up it means you've got a leak.



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