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Thread: throttle bodies

  1. #1
    Registered User brianfisk's Avatar
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    throttle bodies

    Dose any one have any thoughts on throttle bodies wear out?
    I beleive that I have 2 of them gone, hence the bike running very bad. I have a jerry rigged set up on the left one since coming home from the Finger Lakes. The return spring broke. They are NA from BMW you need to buy the TB to get the spring,($331 ea. list at the dealer).

    The bike really surges at off idle runs rich, seems to be good at speed (70 plus). Pretty much unrideable.
    Brian Fisk

  2. #2
    Registered User AntonLargiader's Avatar
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    Well, you need both TBs to be in good shape for the bike to run right... pretty basic stuff, there. You didn't say what bike this is; a lot of TBs are less money than that. The right-side one for my RS is only $140 or so.

    Most of them fail by excessive wear on the shaft. There are definitely some dead ones around which would have good springs that you could harvest.

    Which TB model is it? It's stamped on the bottom flange of the TB.

    Some info on http://www.largiader.com/tech/tb/
    Anton Largiader 72724
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    Virginia Motorrad Werkstatt BMW motorcycle service and repair in central Virginia

  3. #3
    Registered User brianfisk's Avatar
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    tb

    Anton, My bike is a 1997 R100RT. Thanks for your info. I sometimes feel as if I am the guiena pig. I have the problems first. I would rebuild these puppies if I could NOW I guess I'll have to buy nwe and just do it. But this will help others, and soon! Thanks

  4. #4
    Registered User AntonLargiader's Avatar
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    List price for replacements is $328 left and $139 right. Ouch. Of course Chicago is 20% off that. If you need a spring for the left side, my old right-side unit probably won't have what you need, and I wouldn't be able to find it for a week or two, probably.

    Ask around and see if anyone has a dead left-side TB that you can harvest a spring from. That is a truly rare failure. S**t, I'd wind a new spring out of baling wire before I paid $328.

    Oh, BTW you should follow the link to Bing on my page. They probably can get you just the spring.
    Anton Largiader 72724
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  5. #5
    Blocking the slow lane
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    Try McMaster-Carr? Seems like they would offer a wound spring that could replace that part.

    http://www.mcmaster.com
    Jon Diaz
    BMW K75/K12GT
    BMWMOA Ambassador

  6. #6
    Chad Slacker
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    List price for replacements is $328 left and $139 right. Ouch.
    The left side IS available without the Throttle Position Sensor. Without the TPS the left TB is about the same price as the right.

    If the parts counter still says N/A, have them check the TBs for another model. The TB sans TPS is not listed separately for every model.

    - Jim

  7. #7
    Registered User AntonLargiader's Avatar
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    That would be great, but I can't find anything in the fiche like you describe for the R1100 series. As far as I can tell, the high price is the price for just the throttle body, without a switch. Can you give me an example of a part number for the 'cheaper' left side TB?
    Anton Largiader 72724
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  8. #8
    Registered User brianfisk's Avatar
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    more TB

    Well I went a head and bought both TB from Chicago BMW. the left one was $262.40 and the right $129.93. I will look to rebuild the old ones thanks to Anton info. I wiswed that I knew you could buy the left one without the TPS . $ 130 would look good in my wallet.
    Don't know hwen I'll get them buit it will be tooo late to get to the RA rally this weekend. Hopefully I'll have then so that I can get to the Falling Leaf Rally. Meanwhile I'll use the LS for the next 2 campouts, (I am getting to old (read fat)to ride the LS that far in the rain).
    Thanks for the comments and help! Brian

  9. #9
    leave my monkey alone LORAZEPAM's Avatar
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    Dang too bad you bought the new ones already, there is a guy on the RS site that would have sold you both TB, for around 180.00 used.
    Gale Smith
    2009 Versys
    1999 R1100RT

  10. #10
    Registered User AntonLargiader's Avatar
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    Originally posted by lorazepam
    Dang too bad you bought the new ones already, there is a guy on the RS site that would have sold you both TB, for around 180.00 used.
    If you were thinking about the '94, those are different TBs.
    Anton Largiader 72724
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  11. #11
    rabid reader dbrick's Avatar
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    Originally posted by AntonLargiader
    If you were thinking about the '94, those are different TBs.
    The RS TBs are different for different years? Or is it the RS vs. RT distinction that makes them different?
    David Brick
    Santa Cruz CA
    2007 R1200R

  12. #12
    Registered User AntonLargiader's Avatar
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    Originally posted by dbrick
    The RS TBs are different for different years? Or is it the RS vs. RT distinction that makes them different?
    Two versions (RS and GS) and three revs of each.

    More than you ever wanted to know here.
    Anton Largiader 72724
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    Virginia Motorrad Werkstatt BMW motorcycle service and repair in central Virginia

  13. #13
    dlearl476
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    Could someone explain to me how a throttle body "wears out" so it needs a complete replacement instead of a couple of 20? shims or a new shaft/plate? Especially one less than 20 years old?
    Or is this just more "lore" of the "Legendary Motorcycles of Germany"?

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