Results 1 to 15 of 29

Thread: Fork Seals - K100

Hybrid View

  1. #1
    Carguz
    Guest

    Fork Seals - K100

    How tough a job is a fork seal replacement on an '85 K bike?

    Since, I'm painting, I have the fairing and everything else off the bike. Do I need special tools? Is it tough for a first time job? While I'm at it, I plan to replace pads. Any hints, tips, etc. much appreciated.

    Carlos

  2. #2
    Benchwrenching PGlaves's Avatar
    Join Date
    Oct 2003
    Location
    "Big Bend" TX
    Posts
    8,728
    Quote Originally Posted by Carguz View Post
    How tough a job is a fork seal replacement on an '85 K bike?

    Since, I'm painting, I have the fairing and everything else off the bike. Do I need special tools? Is it tough for a first time job? While I'm at it, I plan to replace pads. Any hints, tips, etc. much appreciated.

    Carlos
    Remove the axle and loosen the bolts going straight up into the bottom of the fork -AFTER - draining the fork oil.

    With the bike on the centerstand the fork sliders will pull straight down off the fork tubes and just clear the damping rods before the sliders hit the floor.

    I don't think that model has a snap ring above the seal but look carefully to make sure. If it does, remove the snap ring with snap ring pliers.

    Then use a wide bladed screw driver to carefully pry the seal out - be careful not to gouge the aluminum bore. Clean the recess thoroughly.

    Then drive the new seals into place. The factory tool is a seal driver with a shank that is the same size as the fork tube. Some folks have found white plastic pipe the right size and with a length of the pipe and a fitting have made their own.

    If you are careful you can drive the seal flush with a piece of wood on top of it and then seat the seal in the bottom of the recess with a large socket that just fits the outside diameter of the seal.

    They are actually quite easy to replace but just be careful prying and pounding.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://www.bigbend.net/users/glaves

  3. #3
    Carguz
    Guest
    Almost sounds like I can pull it off. The Clymer manual describes the whole fork disassembly process but it sounds like I just need to focus on the bottom leg of the forks. Any recommendations on the oil, type, quantity, etc.

    Are the pads easy enough?

  4. #4
    Registered User
    Join Date
    Jun 2004
    Posts
    140

    k75S

    Paul;

    Is the procedure the same for a 93 K75S??

    I'm due for a change.

  5. #5
    3 Red Bricks
    Join Date
    Jan 2007
    Location
    Pleasanton, Ca.
    Posts
    3,401
    No. The newer forks (after 8/91) require that the seal come off the top of the fork tube. The forks have to come off the bike.
    Check your manual.


    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

  6. #6
    Registered User
    Join Date
    Jun 2004
    Posts
    140
    Quote Originally Posted by 98lee View Post
    No. The newer forks (after 8/91) require that the seal come off the top of the fork tube. The forks have to come off the bike.
    Check your manual.


    That's What I thought and why I have putting the job off.

  7. #7
    Rally Rat
    Join Date
    Mar 2007
    Location
    Rochester, MN
    Posts
    168
    if you don't have a socket large enough go to a hardware store and get an "electrical" pipe coupler that is the right size, I bought my last summer for about $2 and then tapped it in w/ a block of wood and hammer.

  8. #8
    Benchwrenching PGlaves's Avatar
    Join Date
    Oct 2003
    Location
    "Big Bend" TX
    Posts
    8,728
    Quote Originally Posted by scbmwrider View Post
    Paul;

    Is the procedure the same for a 93 K75S??

    I'm due for a change.
    1992 and later (model year) bikes have the Showa forks instead of the Marzochi (sp?) forks on the earlier ones. The Showa forks have a bushings internal to the sliders and external to the fork tubes that inhibit the removal of the slider from the fork tube.

    They do come apart if jerked on slide hammer fashion, but then tricky technique and special tools are needed to put it back together. So aftermarket manuals advise to get the seal out and slide it up off the fork tube. Then a 2 foot (or so) plastic pipe with an ID to match the fork seal OD is used to drive the new seal.

    I suppose the Showa forks are theoretically "better" what with bushings and everything - but they were a huge leap backwards as far as maintainability is concerned.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://www.bigbend.net/users/glaves

  9. #9
    Registered User
    Join Date
    Jun 2006
    Location
    Central New York State
    Posts
    10

    K Bike Fork Seal Replacement

    Dear Fellow K Bike Owners:

    I have replaced the Fork Seals on my 88 K 75 and always removed the plugs on the top of the fork tubes before pulling off the legs. In that way, the spring pressure is removed. You will have to pull the top plugs anyway in order to put fork oil back into the forks.

    Also, you may see a lot of sludge in the bottom of the fork legs. I always clean that gunk out before reinstallation.

    Steve Littlefield

  10. #10
    Route 66 Missouri gstom's Avatar
    Join Date
    Mar 2003
    Location
    Joplin, Missouri
    Posts
    695

    Snap ring

    I have a 1988 K100LT. I have removed the slider from the fork leg. The seal is held in with a snap ring that is simply a wire in a groove. There are no s" in which to place a snap ring pliers. How is the best way to remove this ring? I can't get in behind it to pry it out and I am leary of using too much force. Any tips?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •