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Thread: K100RS fork rebuilt

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  1. #1
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    K100RS fork rebuilt

    Hi All,

    Scored a set of used front forks off someBay and like to rebuilt them for my bike. Question I have is the cup that goes over the inner tube -- is that functional? It seems that it's just a piece that prevents dirt from getting in. At $21 a piece, I was hoping you all tell me it's non-essential.


    Also Should I order things that are labeled "gaskets" ? There are ones listed with "inner tube". some with "absorber" and some with "damper" on the microfiche. What do I actually have to replace? And I did a search in Progressive Springs and didn't see much. What's the latest opinion on them?

    Thanks


    Chuck

  2. #2
    A bozo on the bus deilenberger's Avatar
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    Chuck,

    Are these the same forks as are on your '85? Starting in '86 there were some changes made to the long-travel (and rather soft) K100 forks. As far as the parts, if you can provide a link to a photo or webpage using those terms it would help a lot in answering your questions.
    Don Eilenberger http://www.eilenberger.net
    Spring Lk Heights NJ NJ Shore BMW Riders New Sweden BMW Riders
    '07 R1200R (current ride) and some bimmers.. and a Porsche

  3. #3
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    Hi Don,

    Thanks for the reply. The set I got has the same part numbers as the pair I have on the 85 right now, so I'm assuming they are the same.

    What I was referring to as "cup" is the part labeled as 1. My set doesn't have the circlip inbetween the fork seal and the cup but has a ring washer.
    Attached Images Attached Images

  4. #4
    A bozo on the bus deilenberger's Avatar
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    Hi Chuck,

    The drawing you're looking at is of a later year set of forks, and they are different from the forks on your bike (and I'd assume the ones you bought, which do look like '85 forks.) The giveaway is the fork-bridge.. that started with the S series forks on the '87 K75S. The forks you have do not have a clip above the seal (it's just pressed in) - and the "cup" is the dust shield for the seals (keeps rain/munge away from the fork seals to some extent.)

    I'd suggest heading over to www.realoem.com - and enter your VIN# (the last 8 letters/digits) so you can see a diagram that is specific to the forks you'll be rebuilding. REALOEM can drill right down by year/model/month to the correct drawings if you give it a bit of info.
    Don Eilenberger http://www.eilenberger.net
    Spring Lk Heights NJ NJ Shore BMW Riders New Sweden BMW Riders
    '07 R1200R (current ride) and some bimmers.. and a Porsche

  5. #5
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    thanks Don. That's why I was getting confused because the diagram isn't what I'm seeing and words used in the microfiche "cup" and "dust shield" are words describing the same thing. Thanks for the link to realoem.

  6. #6
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    My last 7 digits on the VIN are: 0042322. Realoem shows the same diagram, poss due to updates on parts designs?

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