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Thread: R1100RT Throttle Body Knock

  1. #1
    Registered User dieselyoda's Avatar
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    R1100RT Throttle Body Knock

    When I found this, while looking for another problem, I was blown away. Originally I had thought I was looking at the expensive and time consuming complaints of cam chain tensioners or guides when I first noticed the knocking sound from my bike. I was absolutely certain that I was going into an engine rebuild along with my imminent tranny tear down.

    What I found was this (video quality isn't great, but listen): http://www.youtube.com/watch?v=ghF9n...ature=youtu.be

    Something so simple, easy to repair and best of all, not a lot of money, $230.00 for both throttle bodies, full kits, OE Bing.

    And it proves my point, keep it simple. When I start taking my own advice, I will quit drinking beer.

    Yeah, that's not going to happen.
    1997 R1100RT (Restored Basket Case) , 1981 KZ 440 LTD (Restored Basket Case)
    1986 K75S(the beutch), 1993 K1100RS (blown engine), 1997 Chev Short Box (4x4 with an LT1)
    "Life isn't about how fast or how high, it's about how well you bounce."

  2. #2
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    So what was making the noise? Did one of your butterfly shafts come loose in the bearing?
    Current Rides;
    1999 R1100S
    1988 Ducati Paso 750

  3. #3
    Registered User
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    the shaft & bushing wear out.

    MUCH less expensive from Dan Cata, over at advrider. I purchased 2 kits from Dan, for less than one Bing kit. Just sayin'.

    http://www.advrider.com/forums/showthread.php?t=630335
    Ride Safe, Ride Lots

  4. #4
    Registered User R100RTurbo's Avatar
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    KM on TB's

    Or, KM's on bike if I might ask?

  5. #5
    rabid reader dbrick's Avatar
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    Anton's page on this subject can be helpful: http://www.largiader.com/tech/tb/
    David Brick
    Santa Cruz CA
    2007 R1200R

  6. #6
    Pepperfool GSAddict's Avatar
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    Dan has sold lots of kits for $60 a side.
    Lots of happy customers.
    http://advrider.com/forums/showthread.php?t=630335
    '
    Ufda happens..........

    It's all about the details.

  7. #7
    Registered User dieselyoda's Avatar
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    Wow, great advice!

    I assume worm throttle shaft in the bushing. I haven't taken it apart yet.

    The bike has 57,000 miles on it.
    1997 R1100RT (Restored Basket Case) , 1981 KZ 440 LTD (Restored Basket Case)
    1986 K75S(the beutch), 1993 K1100RS (blown engine), 1997 Chev Short Box (4x4 with an LT1)
    "Life isn't about how fast or how high, it's about how well you bounce."

  8. #8
    Day Dreaming ... happy wanderer's Avatar
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    Another way to test for this is to spray WD40 or propane around the bushings. If idle speed picks up they are worn and sucking air in. Some wiggling helps expose the problem.

    The only reason I mention this is the mileage seems a bit low for them to be worn already and my bike does exactly the same thing if the throttle cables adjusted even the slightest bit too tight.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  9. #9
    Registered User dieselyoda's Avatar
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    Quote Originally Posted by happy wanderer View Post
    The only reason I mention this is the mileage seems a bit low for them to be worn already and my bike does exactly the same thing if the throttle cables adjusted even the slightest bit too tight.
    Cables loose, mileage relatively low, chronological time quite high. Confirmed today (didn't take it apart yet, trying to squeeze a few days riding left) that there is significant radial movement. I didn't throw a dial indicator on it but my guess is almost 0.200" of movement.

    I took the tupperware off the other side because I was a bit concerned. Nothing, perfect.

    I just want a couple more days of riding. Big question: How do I go for a bit of a boo with my finger on that throttle shaft?

    Just kidding, but on a more serious note, great weigh-ins. Thank You.
    1997 R1100RT (Restored Basket Case) , 1981 KZ 440 LTD (Restored Basket Case)
    1986 K75S(the beutch), 1993 K1100RS (blown engine), 1997 Chev Short Box (4x4 with an LT1)
    "Life isn't about how fast or how high, it's about how well you bounce."

  10. #10
    Registered User BILKAR's Avatar
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    I got just the right side kit from Dan first when my 96 GS started making that sound almost two years ago.
    It actually improved my surging issue as well (though that could also have been replacing the TB O-rings that were cracked)

    I have read that the TPS keeps the left shaft from making noise, but I am about ready to get a kit from Dan for the left TB.


    -bil
    i pretend to work... they pretend to pay me...

  11. #11
    Nickname: Droid ANDYVH's Avatar
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    I did both TB's myself on my 94 RS at 135,000 miles. I was able to do the work myself, and dial in the balance much better using my mercury sticks. Bike stills idles very smooth now and is easy to adjust.
    Get trained! The best "performance" upgrade you can get is YOU. Visit msf-usa.org for training info.

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