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  1. #1
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    High Mileage Mainteinance

    My 1990 K75RT now has 200000 mi and I am wondering if there are maintenance steps that should be taken now besides the level II schedule? I do the drive shaft splines on a 20000 mi schedule but I am wondering more about Clutch splines (never done), Valve check (done once @ 75000), and the Timing chain or tensioner. The bike runs well and started recently on a half a crank (instantly) after sitting for over 6 mo. Any suggestions would be greatly appreciated. Thank You, Les

    PS. Is there a printed or online schedule for high mileage maintence items?
    Last edited by LesZman; 01-18-2021 at 01:47 PM. Reason: additional question

  2. #2
    Quote Originally Posted by LesZman View Post
    My 1990 K75RT now has 200000 mi and I am wondering if there are maintenance steps that should be taken now besides the level II schedule? I do the drive shaft splines on a 20000 mi schedule but I am wondering more about Clutch splines (never done), Valve check (done once @ 75000), and the Timing chain or tensioner. The bike runs well and started recently on a half a crank (instantly) after sitting for over 6 mo. Any suggestions would be greatly appreciated. Thank You, Les
    I recommend you clean and lubricate the clutch splines as soon as convenient.

    Manually check the front wheel bearings every time the wheel is off.
    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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    Les,

    I'm sorry, it's kind of hard to take your request seriously.

    You've only checked your valves once in 200,000 miles and only lube your splines every 20,000 miles and your bike is still running fine?????

    And NOW your asking US for mainenance advice? Something tells me that you will continue with what has been successful for you in the past. Maybe we can get some tips on how to get the valves not to close up or how to get splines to not wear?

    You must be extremely gentle on your bike.




    Last edited by 98lee; 01-18-2021 at 08:39 PM.
    LONG MAY YOUR BRICK FLY!

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    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
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  4. #4
    Dances With Sheep GREGFEELER's Avatar
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    Quote Originally Posted by LesZman View Post
    My 1990 K75RT now has 200000 mi and I am wondering if there are maintenance steps that should be taken now besides the level II schedule? I do the drive shaft splines on a 20000 mi schedule but I am wondering more about Clutch splines (never done), Valve check (done once @ 75000), and the Timing chain or tensioner. The bike runs well and started recently on a half a crank (instantly) after sitting for over 6 mo. Any suggestions would be greatly appreciated. Thank You, Les

    PS. Is there a printed or online schedule for high mileage maintence items?
    I agree with Lee that if you bike is really "fine" at 200k with only the maintenance you've described, then we all have something to learn from you. . However, if it were me, here's what I would do: (with the general assumption of doing all the other logically related items at the same time)

    1. Lube the clutch splines now.
    The vast majority of K-bike riders have to do this about every 30,000 to 45,000 miles because of shifting problems, or they end up replacing a clutch disk and/or the transmission input shaft. This is a perfect time to lube both ends of your drive shaft. See #6 below.

    2. Check/replace clutch.
    At that mileage you probably need a new disk at a minimum. While at it replace the clutch O-ring and rear main seal.

    3. Check valves, change plugs & air-filter.
    These engines will go a very long time between valve adjustments but 150k as you describe would be a record.

    4. Check and/or replace cam chain and nylon tensioner guide.
    BMW is far too aggressive in their change interval for the guide, but I would want to know it was still good at this mileage.

    5. Carefully check all hoses and rubber bits for deterioration.
    Check the crank case breather hose. Test for air leaks around the bottom of the throttle body manifolds at the head, and the fuel injector O-rings (spray with starting fluid or carb cleaner lightly).

    6. Check and lube the splines on the *front* of the drive shaft, if you haven't been doing so.
    While you are at it I would love to see good photos of your rear drive shaft splines and the rear drive input (pinon) splines. Most people who get long life from their drive shafts lube the rear splines at every rear tire change.

    7. Check the fork head bearing free play.
    Read up on this process as you must release the steering damper internal to the fork head and then re-activate it. Personally, I would pull the fork head bearings appart for at least a re-greasing as they must be dry at this point.

    8. Check front wheel bearings for smoothness and tightness at *every* tire change.
    I've never heard an "official" front wheel bearing life estimate, but 200k is getting your money's worth.
    Greg Feeler
    Ambassador & 2022 BMW MOA Rally Co-Chair
    1972 R75/5, 1990 K75, 1990 K1, 1992 K75S, 2003 K1200RS

  5. #5
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    Paul and Greg, Thank You very much for the very constructive maintenance suggestions Les.

  6. #6
    Dances With Sheep GREGFEELER's Avatar
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    Quote Originally Posted by LesZman View Post
    Paul and Greg, Thank You very much for the very constructive maintenance suggestions Les.
    Keep us posted with your maintenance and additional mileage on your bike. There is an MOA member I met at our rally in Gillette, WY who had 850,000 miles on his K75 at that time, so you have a lot more life left in your bike.
    Greg Feeler
    Ambassador & 2022 BMW MOA Rally Co-Chair
    1972 R75/5, 1990 K75, 1990 K1, 1992 K75S, 2003 K1200RS

  7. #7
    Quote Originally Posted by GREGFEELER View Post
    Keep us posted with your maintenance and additional mileage on your bike. There is an MOA member I met at our rally in Gillette, WY who had 850,000 miles on his K75 at that time, so you have a lot more life left in your bike.
    Old Smokey died in an Interstate crash at 370,000 during a 49 state/ten day ride.
    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/

  8. #8
    Registered User drneo66's Avatar
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    Assuming you're not, a regular check of the black vibration damper around the fuel pump is in order now and in the future.

    I'd also run some Red Isoheet through the tank to pick up any water that may have accumulated from the 4000 gallons of gas that have run through the bike so far.
    Current: 2007 BMW R1200RT, 2013 F800GS
    Former: 1995 BMW K75S, 2009 BMW G650GS
    MOA Member #:150400, IBA#: 37558

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