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Thread: Question about final drive update to 1991 K75

  1. #1
    Registered User 75450's Avatar
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    Question about final drive update to 1991 K75

    I'm looking at a 1991 K75RT and the ad states this: ""Bruno's" final drive and drive shaft installed at 28k". The bike currently has 37K miles. What exactly is this "Bruno" update/upgrade?
    2000 K1200RS, 2004 R1100S
    2005 K1200S, 2016 F800GT
    2018 R9T, 2018 C650GT

  2. #2
    The OEM driveshaft and pinion shaft splines were subject to premature wear. Bruno's Machine (Bruno) repaired the worn pinion shaft splines and drive shaft splines by replacing them with a longer engagement area and also sealed the hollow space in the driveshaft to better retain the grease that was used to lubricate the splines. Without this modification I clean and lubricate these splines every rear tire change.
    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
    rabid reader dbrick's Avatar
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    This would be a lubrication point (zerk fitting) in the u-joint at the front end of the driveshaft.

    Bruno was (he's no longer in business) a Canadian machinist who figured out how to do this job, the u-joints last much longer when lubed. He may have been the only person in North America who did the work.
    David Brick
    Santa Cruz CA
    2007 R1200R

  4. #4
    Registered User 75450's Avatar
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    Thanks to both of you.
    2000 K1200RS, 2004 R1100S
    2005 K1200S, 2016 F800GT
    2018 R9T, 2018 C650GT

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