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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

  5. #5
    Registered User 75450's Avatar
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    I never purchased this bike but it is up for sale again -- I guess he didn't sell it -- same guy for sure. It looks really nice. The guy is asking $4100, which is a bit high -- not bad I don't think. It has 37K miles with new tires 3K miles ago.

    I don't need another bike but I've always wanted a K75. I would prefer an "S" model but I really like the color of this "RT". What do you brick guys think?

    1991-BMW-K75RT.jpg
    2000 K1200RS, 2004 R1100S
    2005 K1200S, 2016 F800GT
    2018 R9T, 2018 C650GT

  6. #6
    Debbie's Servant Lee's Avatar
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    Quote Originally Posted by 75450 View Post
    It has 37K miles with new tires 3K miles ago.

    I don't need another bike but I've always wanted a K75. I would prefer an "S" model
    Only 3,000 miles on the tires, but how old?
    If it was me I would hold out for a nice S.
    We thought our K75S bikes were great.
    Never noticed any heat with our Ss but heard plenty of complaints of heat with the RT.
    Since you live in the SW you may be happier with a S.

    Durango Colorado.JPG
    Last edited by Lee; 06-27-2019 at 01:29 PM.
    Lee
    2016 R1200RS
    MOA # 30878
    Past BMW Bikes: 2011 K1300S, 2003 K1200RS, 1991 K75S, 1987 K75T, 1984 R100RT

  7. #7
    Registered User 75450's Avatar
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    Quote Originally Posted by Lee View Post
    On 3,000 miles on the tires, but how old?
    If it was me I would hold out for a nice S.
    We thought our K75S bikes were great.
    Never noticed any heat with our Ss but heard plenty of complaints of heat with the RT.
    Since you live in the SW you may be happier with a S.
    Thanks Lee. You're right of course . . . 3K miles on 10-year old tires isn't the bargain that it sounds like. I've heard that before, about the heat of the RT's -- thanks for reminding me.

    I'm not that eager to buy this bike, but even in a big metro area like Phoenix, decent well-kept relatively low mileage K75's don't pop up often.

    Are those his and hers K75S's?
    Last edited by 75450; 06-27-2019 at 12:28 AM.
    2000 K1200RS, 2004 R1100S
    2005 K1200S, 2016 F800GT
    2018 R9T, 2018 C650GT

  8. #8
    3 Red Bricks
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    This Lee agrees with the other Lee. Hold out for a nice S if you can find one.

    You won't be happy with the lack of airflow behind the fairing of an RT in Phoenix. The fairing is too efficient for hot areas.




    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

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

  9. #9
    Registered User 75450's Avatar
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    Quote Originally Posted by 98lee View Post
    This Lee agrees with the other Lee. Hold out for a nice S if you can find one.

    You won't be happy with the lack of airflow behind the fairing of an RT in Phoenix. The fairing is too efficient for hot areas.




    Thanks!

    One thing I am is patient. I waited a long time to find my other bikes -- I rarely buy new.
    2000 K1200RS, 2004 R1100S
    2005 K1200S, 2016 F800GT
    2018 R9T, 2018 C650GT

  10. #10
    Debbie's Servant Lee's Avatar
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    Quote Originally Posted by 75450 View Post
    Are those his and hers K75S's?
    Yes they are
    Also had a matching pair of blue K75T bikes.
    Lee
    2016 R1200RS
    MOA # 30878
    Past BMW Bikes: 2011 K1300S, 2003 K1200RS, 1991 K75S, 1987 K75T, 1984 R100RT

  11. #11
    Registered User 75450's Avatar
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    Quote Originally Posted by Lee View Post
    Yes they are
    Also had a matching pair of blue K75T bikes.
    You da man!

    I've decided not to pursue the purchase of the RT. I wasn't looking forward to that long drive anyhow. Thanks for the info.
    2000 K1200RS, 2004 R1100S
    2005 K1200S, 2016 F800GT
    2018 R9T, 2018 C650GT

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