BMW K bikes (Bricks)

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1Back to top Go down   Does this clutch look 'Toast'? Empty Does this clutch look 'Toast'? on Mon Jul 29, 2019 5:00 am

Bikelord

Bikelord
active member
active member
Hi, everyone!

I've currently got my 1987 k100rt Ex-Police Bike apart replacing the rear main seal and, the 6 rivet output shaft.

Whilst I've got the whole bike apart I decided to inspect the clutch, however I'm not too entirely familiar with how dry clutches should look, as I'm more used to a wet clutch of your everyday motorcycle.

This is what my clutch currently looks like, it measures between 4.68 around the outside and 5.20 around the inside. Manual says service limit is 4.50, which is getting close-ish.

My question is do these pressure plates and friction plate look normal? I can see signs of scoring and wear, but I don't really know what I'm looking for. As a side note, the clutch seemed to be functioning normally when I used the bike last, and the clutch has not been contaminated by oil.

Does this clutch look 'Toast'? Fricti10
Does this clutch look 'Toast'? Fricti11Does this clutch look 'Toast'? Fricti12
Does this clutch look 'Toast'? Pressu10Does this clutch look 'Toast'? Pressu12
Does this clutch look 'Toast'? Pressu13
Does this clutch look 'Toast'? Pressu11


__________________________________________________
BMW K100RT 1987
BMW K100rt 1987 White Ex-Police (CHiPs)
    

2Back to top Go down   Does this clutch look 'Toast'? Empty Re: Does this clutch look 'Toast'? on Mon Jul 29, 2019 7:00 am

Dai

Dai
Life time member
Life time member
If you're that far in, I'd change the clutch anyway. Depending on abuse, it has maybe a few thousand miles left on it. As for the pressure plates; being an ex-police bike I'm not surprised that they're showing signs of localised overheating. As long as they're flat, they'll be okay. Whatever you do, be very, very careful not to bend the locator pins. They're quite soft and I can absolutely guarantee hours of fun trying to get everything re-aligned after you've bent them.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

3Back to top Go down   Does this clutch look 'Toast'? Empty Re: Does this clutch look 'Toast'? on Mon Jul 29, 2019 7:03 am

moriarti

moriarti
Silver member
Silver member
At this stage of stripdown it would be sensible to install a new clutch assembly,It would be a right pain in the bum to have to strip down again in a few months or miles,not cheap but good practice. mech


__________________________________________________
1984 k100 rs red/black VIN  0004449
    

4Back to top Go down   Does this clutch look 'Toast'? Empty Re: Does this clutch look 'Toast'? on Mon Jul 29, 2019 9:53 am

RicK G

RicK G
VIP
VIP
Your steel plates are dished and if you put a new pate in it will only grip on the outer edge and slip.
I would be putting a complete new pack in or leave it alone and it will probably give some more good service if treated with respect.
I have done it twice and neither bike has come back with clutch problems.


__________________________________________________
"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 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

5Back to top Go down   Does this clutch look 'Toast'? Empty Re: Does this clutch look 'Toast'? on Mon Jul 29, 2019 11:08 am

duck

duck
Life time member
Life time member
@RicK G wrote:or leave it alone and it will probably give some more good service if treated with respect.

I'd go with this. Don't abuse it and fix it when it starts slipping.

Some police clutches (like those of traffic cops) take a lot of abuse since they routinely go from zero to really fast every time they need to chase down a speeder. Also, police don't have to pay for maintenance so them of them don't care how hard they are on a bike.


__________________________________________________
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
http://www.ClassicKBikes.com
    

6Back to top Go down   Does this clutch look 'Toast'? Empty Re: Does this clutch look 'Toast'? on Tue Jul 30, 2019 5:38 am

jbt

jbt
Silver member
Silver member
Change disc & plates. Even if you could cope with it like that you'll have to do it soon.
I know the bad treatments police bikes endure as I used to inflict them...
Don't forget to  apply specific  grease  (Staburags NBU 30 PTM or Optimol) on the shaft and disc teeth and, usually forgotten, on the red marks seen beneath (it's a R100 scheme but very similar to K100)Does this clutch look 'Toast'? Lubrif10
Parts must be cleaned before with no grease at all, then you can apply this grease diluted with trichloethylene (1:5) and let it dry before mounting.
No need to spread a thick layer of grease, it's not a pancake and the extra grease could be centrifuged on the plate!
This will give you a smooth one-finger clutch.

    

7Back to top Go down   Does this clutch look 'Toast'? Empty Re: Does this clutch look 'Toast'? on Tue Jul 30, 2019 6:16 am

Bikelord

Bikelord
active member
active member
Awesome information guys, thanks for the help!

So I've pretty much come the conclusion that I'll be replacing the entire clutch.
I figure that there will never be a more opportune time, as the is now to swap it out easily.
The price of a new clutch does kill me a little, but I do like the piece of mind.
For those that are interested, this is the current state of my bike  lol!

Does this clutch look 'Toast'? Img_3110


__________________________________________________
BMW K100RT 1987
BMW K100rt 1987 White Ex-Police (CHiPs)
    

8Back to top Go down   Does this clutch look 'Toast'? Empty Re: Does this clutch look 'Toast'? on Tue Jul 30, 2019 6:57 am

Dai

Dai
Life time member
Life time member
It doesn't show it on JBT's pic, but put some copper grease on the locating pins (marked 'rondelles' on the diagram). I have pulled a clutch that was a real bastard to get apart because the pins had corroded in. Needless to say, that was where I had the fun getting them all lined up again... Evil or Very Mad


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

9Back to top Go down   Does this clutch look 'Toast'? Empty Re: Does this clutch look 'Toast'? on Tue Jul 30, 2019 8:07 pm

Woodie

Woodie
Life time member
Life time member
That picture looks about right - just a weekend away from being on the road again  Very Happy


__________________________________________________
1985 K100RT
52667
"Keep your stick on the ice.  We're all in this together."  Red Green
    

10Back to top Go down   Does this clutch look 'Toast'? Empty Re: Does this clutch look 'Toast'? on Wed Jul 31, 2019 5:01 am

George_Pap

George_Pap
Silver member
Silver member
If I recall 5.5mm is the thickness of the disc when new, 4.5mm is the worn limit. 
I had clutch slipping one my 1985RT @ 101000kms which had a strange behaviour and took me some time to identify the problem. Clutch was never slipping when I was cruising until 100-120km/h. Once I had to cruise up to 160km/h for 20-25 minutes on 5th gear. After that I have entered city traffic and the clutch started slipping at 4th and 5th gear. 
I did that test again and again and the result was always the same.
Then I have stripped the clutch assembly. Plates were a bit better looking than yous with fewer discolourations ( high friction heat / slipping causes these ) and my clutch disc had left 4.6mm of material. 
Swapped the whole assembly due to plates (slight) warping , also swapped the Rear Main Seal ( old and dry ) and the o-ring. 
My advise would be to replace the whole Assembly with a heat/oil resistant clutch plate in the kit. It would be the last time you deal with the clutch for hundreds of happy km's 
Proper lube as mentioned, new clutch cable and setting and you're set!

Cheers


__________________________________________________
K100RT (Early 1985 -nonABS)
    

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