BMW K bikes (Bricks)

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1Back to top Go down   Clutch Doesn't Disengage Empty Clutch Doesn't Disengage Wed Oct 05, 2022 12:57 am

dnkn

dnkn
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I'm reassembling a 1985 K100RS that came to me in boxes.  The drivetrain was substantially intact, but the clutch cable had been removed so the swing arm was just hanging and the boot between the swing arm and the push rod was torn.  I replace the boot, reinstalled the cable, and adjusted per manual spec.  But actuating the clutch lever doesn't seem to engage the clutch at all.  Just to test, I ran the adjustment screw on the back of the arm all the way in to maximize the throw on the push rod.  Still no engagement of the clutch.  What are possible causes?

Thanks in advance for your help.



Last edited by dnkn on Thu Oct 06, 2022 1:01 pm; edited 1 time in total

    

2Back to top Go down   Clutch Doesn't Disengage Empty Clutch Doesn't Engage Wed Oct 05, 2022 1:12 am

Tom G

Tom G
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G'day, this may be a daft idea but here goes. Is the clutch friction plate fitted the correct way around? Is the release bearing fitted correctly.? Is the whole clutch assembly assembled correctly? Is the clutch cable the correct one? Sorry these suggestions may seem stupid BUT????? Cheers Tom


__________________________________________________
1986 K100RT Ex Police (Slightly modified)
2010 Suzuku DL650 V Strom
1992 R100R
    

3Back to top Go down   Clutch Doesn't Disengage Empty Re: Clutch Doesn't Disengage Wed Oct 05, 2022 1:19 am

dnkn

dnkn
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No suggestions are stupid as far as I'm concerned.  I don't think the clutch was ever disassembled.  Just the cable was removed causing the torn boot.  I suppose something under boot could have slipped out of place.  I know the spring is in there, but I really didn't looked at what was behind the boot very carefully.  I think I remember seeing the bearing.  And the adjustment screw does contact something when it's threaded in part way.
I'm pretty sure the cable is correct, although I plan to replace it with a new one.



Last edited by dnkn on Wed Oct 05, 2022 6:45 am; edited 1 time in total

    

4Back to top Go down   Clutch Doesn't Disengage Empty Re: Clutch Doesn't Disengage Wed Oct 05, 2022 3:16 am

Laitch

Laitch
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dnkn wrote:. . . actuating the clutch lever doesn't seem to engage the clutch at all.  Just to test, I ran the adjustment screw on the back of the arm all the way in to maximize the throw on the push rod.  Still no engagement of the clutch. 
Were the engine and transmission attached to each other when you received this relic? Which is happening now—is it seized in gear, or seem stuck in neutral?


__________________________________________________
1995 K75 86,000 miles
Clutch Doesn't Disengage Usa-lo10
    

5Back to top Go down   Clutch Doesn't Disengage Empty Re: Clutch Doesn't Disengage Wed Oct 05, 2022 6:33 am

dnkn

dnkn
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Engine and transmission were attached.  It isn't stuck in gear or in neutral.  I can shift the gears.  If the bike is running, it clunks into first and the back wheel starts spinning, as if I didn't pull the clutch at all.

    

6Back to top Go down   Clutch Doesn't Disengage Empty Re: Clutch Doesn't Disengage Wed Oct 05, 2022 6:56 am

moriarti

moriarti
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Hi remove pushrod inspect for damage, 2 the clutch plates maybe frozen. good luck Very Happy


__________________________________________________
1984 k100 rs red/black VIN  0004449
    

7Back to top Go down   Clutch Doesn't Disengage Empty Re: Clutch Doesn't Disengage Wed Oct 05, 2022 7:44 am

Rick G

Rick G
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Push the rear brake on to see if the wheel or engine stops


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1999 K1100 LT.
    

8Back to top Go down   Clutch Doesn't Disengage Empty Re: Clutch Doesn't Disengage Wed Oct 05, 2022 10:24 am

Point-Seven-five

Point-Seven-five
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moriarti wrote:the clutch plates maybe frozen. good luck Very Happy
+1  This is where I would start. 

What is the condition of this bike relative to corrosion?  Does it look like it has spent time outdoors?

If the plates are stuck, the suggestion of pulling the clutch in first gear and then hitting the rear brake may break them loose.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

9Back to top Go down   Clutch Doesn't Disengage Empty Re: Clutch Doesn't Disengage Wed Oct 05, 2022 12:34 pm

dnkn

dnkn
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The bike was stored inside, so it's very clean, no corrosion at all. But I'll try the rear break and take a look at the push rod. Thanks for the suggestions.

    

10Back to top Go down   Clutch Doesn't Disengage Empty Re: Clutch Doesn't Disengage Wed Oct 05, 2022 9:24 pm

dnkn

dnkn
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I haven't time to try the suggestions made so far, but a friend of mine suggested that if the clutch plates sat without lubrication for decades, they may have frozen together.  Is that a plausible theory?

    

11Back to top Go down   Clutch Doesn't Disengage Empty Re: Clutch Doesn't Disengage Wed Oct 05, 2022 10:17 pm

Rick G

Rick G
admin
admin
Clutch plates in a K don't have any lubrication they are a dry clutch. The clutch plate may have rusted to the pressure plate causing it to bind.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1999 K1100 LT.
    

12Back to top Go down   Clutch Doesn't Disengage Empty Re: Clutch Doesn't Disengage Wed Oct 05, 2022 10:51 pm

Laitch

Laitch
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The environment of the Brick clutch assembly is not hermetic so humidity and condensation can occur within that confined space regardless of whether the moto is indoors, eventually leading to the plates and fibrous disc seizing together as RickG, moriarti, and Point-Seven-five have indicated.

The clutch assembly, clutch piston, clutch bearing and clutch rod all must be inspected to determine their condition. The transmission input shaft splines would need thorough cleaning and lubrication after a period of neglect anyway, so it's fortunate that this condition occurred before damage of unlubricated shaft or clutch hub splines left you stranded in the wilderness—urban or otherwise.  Smile

You should post well-lit, high-res photos of those splines after they've been cleaned but before they they've been lubricated so their condition can be viewed here.



Last edited by Laitch on Wed Oct 05, 2022 11:49 pm; edited 1 time in total


__________________________________________________
1995 K75 86,000 miles
Clutch Doesn't Disengage Usa-lo10
    

13Back to top Go down   Clutch Doesn't Disengage Empty Re: Clutch Doesn't Disengage Wed Oct 05, 2022 11:35 pm

duck

duck
Life time member
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When you use the word "engage" what do you mean?

When a clutch is engaged that means that a clutch is transferring power from the motor to the transmission and drive train. When you pull in the clutch lever that should disengage the clutch.

Engaging the clutch allows power to transfer from the engine to the transmission and drive wheels. Disengaging the clutch stops the power transfer and allows the engine to continue turning without force to the drive wheels.

https://www.edmunds.com/car-technology/when-fact-meets-friction-the-basics-of-clutch-operation.html#:~:text=Engaging%20the%20clutch%20allows%20power,force%20to%20the%20drive%20wheels.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

14Back to top Go down   Clutch Doesn't Disengage Empty Re: Clutch Doesn't Disengage Thu Oct 06, 2022 12:33 am

dnkn

dnkn
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active member
In that case, the clutch with not disengage.

    

15Back to top Go down   Clutch Doesn't Disengage Empty Re: Clutch Doesn't Disengage Thu Oct 06, 2022 12:41 am

duck

duck
Life time member
Life time member
On a bike that came in boxes of parts with a "mystery history" you're going to want to pull the  transmission to inspect/lube the splines and assess the clutch assembly anyhow.  I'd get to that first and not waste any more time and effort before on this you do that.

I've dealt with oodles of old K bikes, either to part them or bring them back from the dead, and that would be what I'd do.

JM.02

YMMV


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

16Back to top Go down   Clutch Doesn't Disengage Empty Re: Clutch Doesn't Disengage Fri Oct 07, 2022 6:02 am

IainM

IainM
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I had a similar issue when recomissioning my '86 RS after it had been stored unused in a garage for 12 years. The clutch plate had become stuck to the flywheel over that time and I freed it by putting bike in 4th or 5th gear, with clutch lever activated and rocking it back in forth without the engine running. This is a quick and easy thing to do and I dont think should cause any damage.

Iain

    

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