BMW K bikes (Bricks)


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

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    Re: '85 K100RS fork questions on Thu Aug 18, 2016 5:54 pm

Brad-Man

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

A wealth of info available here...


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

RicK G

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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

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

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.


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1983 K100basic vin 0003960 colour red
1987 K100RT vin 0094685 colour, orange peel, sorry, pearl
    

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

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.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

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

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.


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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
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

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

brickrider2

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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    Re: '85 K100RS fork questions on Fri Aug 19, 2016 9:51 pm

RicK G

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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.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

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