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  1. #1
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    '85 K100RS handling question

    Hi everybody,
    so I just acquired a 1985 K100RS with lotsa miles on it (251k). Bike has a great maintenance history and runs well (except a rattle at cold startup- another topic). Here is what I observed today: at 60 mph I am downshifting from 4th to 3rd and when I briefly let go of the handlebars to see how the bike is balanced a wobble starts in the front wheel and it builds very rapidly. As soon as I hold the bars it disappears. No wobble can be felt in any other condition. Only when bike decelerates in that tempo range and when I let go of the bars. Now you may ask, why do you let go of the bars? I usually don't but none of my other 3 beemers do this. Is this a design issue with the K100RS? Any other ideas? Thanks.

  2. #2
    Quote Originally Posted by allemande View Post
    Hi everybody,
    so I just acquired a 1985 K100RS with lotsa miles on it (251k). Bike has a great maintenance history and runs well (except a rattle at cold startup- another topic). Here is what I observed today: at 60 mph I am downshifting from 4th to 3rd and when I briefly let go of the handlebars to see how the bike is balanced a wobble starts in the front wheel and it builds very rapidly. As soon as I hold the bars it disappears. No wobble can be felt in any other condition. Only when bike decelerates in that tempo range and when I let go of the bars. Now you may ask, why do you let go of the bars? I usually don't but none of my other 3 beemers do this. Is this a design issue with the K100RS? Any other ideas? Thanks.
    That is an absolute classic and almost certain result of loose steering head bearings. You should adjust them. Then if you feel any notchiness in the straight ahead position of the steering you should replace them or have them replaced.
    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://web.bigbend.net/~glaves/

  3. #3
    3 Red Bricks
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    Tire balance or tire wear could also agrivate the situation.





    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

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

  4. #4

    Suspension

    Weak or worn out suspension components could also be a factor here.

  5. #5
    Gravity pockets could be a factor.
    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://web.bigbend.net/~glaves/

  6. #6
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    Quote Originally Posted by PGlaves View Post
    Gravity pockets could be a factor.
    You mean gravity pockets in the head bearings?

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