BMW K bikes (Bricks)

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1Back to top Go down   '85 K100RS fork questions Empty '85 K100RS fork questions on Thu Aug 18, 2016 5:47 pm

brickrider2

brickrider2
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My K100RS has what I would consider excessive dive when I brake.  I bought some Wurth fork springs, thinking that at 45 K miles, the OEM fork springs may be a little tired.  (BTW, the Wurth springs are not labeled for their weight, so I've no idea if they are a different spec. than the OEM springs.)  If I change the springs, I'll also change the fork oil.  My Haynes K100 manual seems to have vanished among the clutter of the garage; I looked at the riders manual for the bike, but wasn't able to find the mount of oil the forks should contain.  Can someone tell me how much oil the forks should hold?
In a related issue, my understanding is that a bit less oil would make the fork action more progressive and a bit softer; more oil should make them less progressive and a little firmer.  Correct?
Should I fill them with 10W oil?
TIA

    

2Back to top Go down   '85 K100RS fork questions Empty Re: '85 K100RS fork questions on Thu Aug 18, 2016 5:54 pm

Brad-Man

Brad-Man
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http://www.motobrick.com/index.php/topic,666.0.html

A wealth of info available here...


__________________________________________________
Toys don't make the man - Man makes the toys....
'85 K100RS fork questions Usa-lo10
    

3Back to top Go down   '85 K100RS fork questions Empty Re: '85 K100RS fork questions on Thu Aug 18, 2016 8:38 pm

RicK G

RicK G
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'85 K100RS fork questions Fork_o10


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

4Back to top Go down   '85 K100RS fork questions Empty Re: '85 K100RS fork questions on Thu Aug 18, 2016 8:49 pm

Stan

Stan
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Speaking with a mate who owns a bike shop and they put some car automatic transmission fluid in with the fork oil. Apparently it helps to keep the seals healthy.


__________________________________________________
1983 K100 basic vin 0003960 colour red  GONE
1987 K100RT vin 0094685 colour, orange peel, sorry, pearl..GONE
F800R black
    

5Back to top Go down   '85 K100RS fork questions Empty Re: '85 K100RS fork questions on Thu Aug 18, 2016 9:46 pm

RicK G

RicK G
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I use synthetic Auto trans Fluid, it works well for me but I am a heavy person and for a lighter jockey it may be a bit heavy and stiffen the front too much.


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

6Back to top Go down   '85 K100RS fork questions Empty Re: '85 K100RS fork questions on Fri Aug 19, 2016 9:54 am

duck

duck
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Yes, more fork oil will make forks stiffer.

FYI: There are no standards for fork oil weights so 10W from one manufacturer does not necessarily have the same compressibility as 10W from other manufacturers.

I have always had good luck using Honda SS-8 10W fork oil in all of my Ks.


__________________________________________________
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
    

7Back to top Go down   '85 K100RS fork questions Empty Re: '85 K100RS fork questions on Fri Aug 19, 2016 11:33 am

brickrider2

brickrider2
Life time member
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It's odd that there is no standard among manufacturers of fork oil.  I've no idea what is in my forks now.  According to records, it was replaced by a BMW dealer while the bike was with the previous owner.  
For my own work, I'm going to use some left over Bellray 7 weight mixed with some Bellray 10 weight, combined with the Wurth springs.  Fingers crossed, hoping this will be an improvement for the Marzo fork action.

    

8Back to top Go down   '85 K100RS fork questions Empty Re: '85 K100RS fork questions on Fri Aug 19, 2016 9:51 pm

RicK G

RicK G
admin
admin
With forks and oil it comes down very much to what suits you. What you are planning is a good starting point and would give good handling. With a bit of fiddling at the edges you will find the sweet spot and all your numbers will fall into place.


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

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