Author Topic: Trying to save a bargain K75S and learn something along the way  (Read 33981 times)

Offline Sit

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Ok, so this is my story.  Been riding for a while now, started with an R1150R, sold it, got a R1200GS, sold it and got a K1200LT.  Last year picked up an 89 K100RS.  Love the RS.  So the bug was kind of set, really like both bikes and enjoy working on them.  I just do routine maintenance, but I like it. 

So fast forward to a  month or so ago, and I managed to pick up a 92 K75S for $550!  I knew going in that it had driveline problems, engine ran fine, but no power to rear wheel, just an awful noise when the clutch was pulled.  For $550, couldn't pass it up and figured it would make me leave my maintenance comfort zone and get deep into something.

Today decided to start looking at it.  Prior to taking anything off, for giggles I put bike in gear and tried to turn the rear wheel.  There was resistance, but I could rotate the wheel.  I could feel it skipping the splines?  And hear it, but I could not tell from where, or for that matter it could have been up further in the gear box.  So I pulled the rear tire, and then pulled the final off.  The swing arm and shaft are still on/in the bike.  The final splines look okay?  They do look rounded a bit at the tip, but the rest look square?  I think that is good?  Metal shavings in there though.  The shaft does not look as good.  I was hoping to get the driveshaft out without taking the swing arm off, but I don't think there is enough there to grab to get it to release from the circlip.  So I guess that will be my next adventure, removing the swing arm.  But in the mean time, what does the peanut gallery think of the splines?


  • Portland Oregon
05 K1200LT -  Blue, 89 K100RS - Blue over white
90 K75RT Hack - Blue
92 K75S - Black -Sold, 07 R1200GS-Granite Gray-Sold, 04 R1150R-Titan Silver-Sold, 13 Ural Patrol - White - Sold

Offline TrueAce

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #1 on: August 09, 2016, 03:23:13 PM »
Toast. You know what you gotta do. That's why it was $550.
  • Florida
  • '85 K100GS, '85 K100RSSC,', '94 K1100RS,'10 S1000rr,'14 Ural Sidecar, '15 R Nine T

Offline Laitch

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #2 on: August 09, 2016, 03:40:11 PM »
Toast.
Unbuttered at that.

Get you a long handled channel lock or vicegrip, reach in and grab the driveshaft end with it then see if you can pry it out of the swing arm. If the driveshaft's welds at its other end are smooth enough, it should pop off the transmission shaft and slide on out of there.

You'll need to take it all down to the clutch nut for inspection eventually because maintenance seems to have been a low priority.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Chaos

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #3 on: August 09, 2016, 03:48:44 PM »
Other than the splines that bike looks damn nice!  Easily worth the $550. 
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline Elipten

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Trying to save a bargain K75S and learn something along the way
« Reply #4 on: August 09, 2016, 03:53:23 PM »
New driveshaft replacement available from Ted Porter's Beemer Shop at reasonable pricing.  Good buy for that money.  Easy fix.
  • San Antonio, TX
  • 1990 K75RT

Offline Laitch

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #5 on: August 09, 2016, 03:56:59 PM »
Final drive splines look ok from that angle.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Sit

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #6 on: August 09, 2016, 04:08:37 PM »
Thanks for remarks so far. Going to try to get the shaft and the swing arm off. Tempted to say what they heck and pull the transmission  just to peak at the clutch and all of the splines and clean and lube it all.  If just the shaft is gone I will count myself lucky.
  • Portland Oregon
05 K1200LT -  Blue, 89 K100RS - Blue over white
90 K75RT Hack - Blue
92 K75S - Black -Sold, 07 R1200GS-Granite Gray-Sold, 04 R1150R-Titan Silver-Sold, 13 Ural Patrol - White - Sold

Offline Chaos

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #7 on: August 09, 2016, 04:10:01 PM »
Final drive splines look ok from that angle.

except for that lonely tooth
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline Laitch

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #8 on: August 09, 2016, 04:30:42 PM »
except for that lonely tooth
I think that's the driveshaft you're puncturing with that arrow and not the final drive.

Dentistry has never been my forté, Chaos but now you've deployed your arrow, I think I see saw teeth all around. Let's see straight into its mouth, Sit, with a little more definition and a little less gauzy dreaminess.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Laitch

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #9 on: August 09, 2016, 04:41:16 PM »
Tempted to say what they heck and pull the transmission. . .
It's a must to do that, Sit. You might just save yourself a lot of money in the nick of time.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Sit

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #10 on: August 09, 2016, 04:43:46 PM »
Better angle?
  • Portland Oregon
05 K1200LT -  Blue, 89 K100RS - Blue over white
90 K75RT Hack - Blue
92 K75S - Black -Sold, 07 R1200GS-Granite Gray-Sold, 04 R1150R-Titan Silver-Sold, 13 Ural Patrol - White - Sold

Offline Laitch

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #11 on: August 09, 2016, 04:45:41 PM »
Better angle?
Lovely!  Pull that thing out of there. Operators are standing by, waiting to help you with your order.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Martin

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #12 on: August 09, 2016, 04:48:48 PM »
If you give it a clean we might be able to see better.  Is all that crud metallic, try a magnet on it.
Regards Martin.
  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline Laitch

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #13 on: August 09, 2016, 04:53:59 PM »
If you give it a clean we might be able to see better.  Is all that crud metallic, try a magnet on it.
The glass is always half-full for you, isn't it, Martin :clap: but I'm plagued by darkness. To me it looks like somebody who was punched in the mouth with a mace or who was tortured with a juicer.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Laitch

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #14 on: August 09, 2016, 04:58:46 PM »
Clean up that mess on the final drive side of things, Sit, and let us take a look. That thing must have been howling like an angry cat.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Chaos

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #15 on: August 09, 2016, 06:43:09 PM »
I think that's the driveshaft you're puncturing with that arrow and not the final drive.

Dentistry has never been my forté, Chaos but now you've deployed your arrow, I think I see saw teeth all around. Let's see straight into its mouth, Sit, with a little more definition and a little less gauzy dreaminess.
  well, the driveshaft goes into the final drive and they become one.  And that tooth would be happier with some close neighbors.
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline Laitch

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #16 on: August 09, 2016, 06:45:54 PM »
  well, the driveshaft goes into the final drive and they become one.
A beautifully spiritual description, Chaos.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Shiny

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #17 on: August 09, 2016, 06:52:33 PM »
There are no bargain BMWs.

(don't mind me I'm in a dark place as my bike seems to eat fuel pumps.)
  • Northern Virginia
  • BMW K75T

Offline The Dude

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #18 on: August 09, 2016, 08:10:29 PM »
It takes about 100,000 miles of neglect,to get that....what does the odo say?
$550,that's so good!Chances are it's the original shaft,other end will be ok and clutch splines not too bad(salvagable).
Take it apart.It's not hard just committing.
  • Auckland, New Zealand
  • K75s
Current.
TR6R 1973 from new.
Moto guzzi 850 III .1983 from,almost, new.
K75S 1986 from new.vin-0103141
On my second millionth km.give or take a hundred k Kay's.
"The Dude abides. I don't know about you but I take comfort in that. It's good knowin' he's out there."
All the best!

Offline TrueAce

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #19 on: August 09, 2016, 08:35:17 PM »
When you get this little shaft deal behind you, you'll see the good value in this $500 K.!
  • Florida
  • '85 K100GS, '85 K100RSSC,', '94 K1100RS,'10 S1000rr,'14 Ural Sidecar, '15 R Nine T

Offline Sit

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #20 on: August 09, 2016, 08:56:36 PM »
Got the final cleaned up a bit. I think it looks good. Will work on getting the swing arm off and shaft out tonight or tomorrow.
  • Portland Oregon
05 K1200LT -  Blue, 89 K100RS - Blue over white
90 K75RT Hack - Blue
92 K75S - Black -Sold, 07 R1200GS-Granite Gray-Sold, 04 R1150R-Titan Silver-Sold, 13 Ural Patrol - White - Sold

Offline Laitch

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #21 on: August 09, 2016, 09:25:14 PM »
It does look good, Sit. You'll change its fluid. Splines should be squeaky clean and dry before they're lubed.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline K1300S

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #22 on: August 09, 2016, 10:06:06 PM »
Can't believe you only paid 500 for that.   Steal of the year.

What is the bikes vin? 

What part of the world are you in?
Project Thread "K75s Midlife Refresh"
http://www.motobrick.com/index.php/topic,7810.0.html

Offline Sit

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #23 on: August 09, 2016, 11:03:35 PM »
Yup paid $550 and it came with bags, two oil filters, fuel filter and a clymers manual. Figure since everything works with my LT and RS the bike cost $500 or so.

Got the shaft out and the tranny end looks good, so I am going to at least replace or get the shaft rebuilt.
But, I was curious to find out if the noise was still present when clutch pulled.  So I started the bike and it purred like a kitten, until I pulled the clutch lever and then all kinds of nasty noises started, high pitch whirring, grating sounds etc. So off comes the tranny now.
  • Portland Oregon
05 K1200LT -  Blue, 89 K100RS - Blue over white
90 K75RT Hack - Blue
92 K75S - Black -Sold, 07 R1200GS-Granite Gray-Sold, 04 R1150R-Titan Silver-Sold, 13 Ural Patrol - White - Sold

Offline Sit

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Re: Trying to save a bargain K75S and learn something along the way
« Reply #24 on: August 13, 2016, 11:54:04 AM »
So stand by to stand by.  I am ready to take the transmission of and continue with my adventures, but my sawhorses are occupied right now and there is not enough room in my garage currently to dive in.  Maybe in a week or so I can start taking things off again.  Will update to what I find and the damage, the bike and wallet.
  • Portland Oregon
05 K1200LT -  Blue, 89 K100RS - Blue over white
90 K75RT Hack - Blue
92 K75S - Black -Sold, 07 R1200GS-Granite Gray-Sold, 04 R1150R-Titan Silver-Sold, 13 Ural Patrol - White - Sold

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