BMW K bikes (Bricks)

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1Back to top Go down   Fork oil question Empty Fork oil question Wed Feb 27, 2013 12:14 pm

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Having found that one of my fork seals was leaking, I removed both fork legs from the bike - 1991 K100RS 16 valve. I have changed the seals and bought a litre of 7.5 oil, but cannot understand what amount to put in each leg. The legs are removed and are draining upside down now. Why do some manuals say that each leg has a different amount of fork oil? As the legs are off the bike should I just put 400cc in each?

    

2Back to top Go down   Fork oil question Empty Re: Fork oil question Wed Feb 27, 2013 1:35 pm

Two Wheels Better

Two Wheels Better
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*16V*
K1100LT L 350 cc 400 cc
K1100LT R 400 cc 400 cc

K1100RS L 350 cc 400 cc
K1100RS R 400 cc 400 cc

K1, K100RS L 380 cc 400 cc
K1, K100RS R 380 cc 400 cc

From a previous post under 'Fork Oil Level' in the forum. Under BMW's RSD data sheet for your model the left leg takes .34 to .35 litre and the right hand leg gets .39 to .40 litre of 10W fork oil....

7.5W fork oil will give you a slightly 'plusher' ride but may feel underdamped.

(Looking further into the available official technical data it suggests that only K1 models of that vintage would have variable damping and therefore use different levels in each leg...the 16V K100RS should have 400cc or .40 litre in each fork leg.) Bottom line, BMW contadicts itself.


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1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - Beemers owned still or sold.

~We all believe what we want to believe in - Rob Dickinson
    

3Back to top Go down   Fork oil question Empty Re: Fork oil question Wed Feb 27, 2013 5:27 pm

Guest

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Thanks. I found the same conflicting information too. I chose 7.5 weight oil because I could not find what I should be using and I think the Clymer book said 7.5. I will put 400cc of oil in each leg and see what happens.

    

4Back to top Go down   Fork oil question Empty Re: Fork oil question Wed Feb 27, 2013 6:26 pm

Themason

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7.5 wt is ideal. It won't be under damped but it will ride nice over rough roads.


__________________________________________________
I live in a parallel universe but have a vacation home in reality :arrow:

1984 K-100RS Alaska Blue w/Parelever and 16V wheels.

1984 K-100RS Metallic Madison stock

1986 R-80G/S w/1000 cc engine

2007 Harley Davidson Street Rod Mirage Orange w/XR1200 wheels, Race Tech, True Track, Works Performance shocks

2007 Harley Davidson Street Rod Vivid Black stock

1993-ish K-100/1100RT/LT hemaphrodite frankenbike thingy to be painted satin black from a rattle can eventually
    

5Back to top Go down   Fork oil question Empty Re: Fork oil question Wed Feb 27, 2013 7:27 pm

RicK G

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If the oil has just been drained then .35 in left leg and .4 in right leg because left leg does not drain fully due to the difference in compression and rebound dampers but if the legs have been disassembled and cleaned then .4 in each leg.
I was not sure this was right and when I took each leg apart there was close to 50ml of oil left in the left leg after both had been grained.


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"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   Fork oil question Empty Re: Fork oil question Wed Feb 27, 2013 7:43 pm

klompy the grey brick

klompy the grey brick
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I was wondering why as it seemed ridiculous to have more oil in one leg than another...in fact the total amount is exactly the same carrying out a bay service rather than an Overhaul. Thanks for that Rick.


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KKlompy Fork oil question 2854237993
"Grace" 1984 K100RS Silver VIN 0019026 Mitt eine Staintune Zorst.
"Olivia" 1997 K1100LT Dark Grey VIN WB1052600W0237453.









Chassis number0019026
Vehicle code0503
SeriesK589
ModelK 100 RS 83 (0502 ( 0503 )
Body typeK 100 RS 83 (0502
Catalog modelECE
Production date1984 / 07
Engine0513)

Fork oil question Au-log10


    

7Back to top Go down   Fork oil question Empty Re: Fork oil question Thu Feb 28, 2013 4:32 pm

Inge K.

Inge K.
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bikerboy wrote:I removed both fork legs from the bike - 1991 K100RS 16 valve.
Why do some manuals say that each leg has a different amount of fork oil?
It was a change of the internal parts in the fork ~mid -91.

Early models should be filled with the same amount of oil in both legs.
Later models have cartridges (same as K1100's) and different amount in each leg.
This is when the legs have been drained through the drain plug, when dismantled
it's the same amount in all legs...400 ml.

To identify, early models 10 mm filler plug...late models 12 mm filler plug.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

8Back to top Go down   Fork oil question Empty Re: Fork oil question Thu Feb 28, 2013 4:42 pm

Guest

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Thanks for that Inge. I have not stripped the fork legs, but have r3emoved them from the bike. I can confirm that it must be early '91 as it has 10mm filler plugs.
Next think is to order the front brake discs and pads, but at least I know that I need two discs and four pads!

    

9Back to top Go down   Fork oil question Empty Re: Fork oil question Thu Feb 28, 2013 5:59 pm

Themason

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Why do you need new discs? Those seldom wear out.


__________________________________________________
I live in a parallel universe but have a vacation home in reality :arrow:

1984 K-100RS Alaska Blue w/Parelever and 16V wheels.

1984 K-100RS Metallic Madison stock

1986 R-80G/S w/1000 cc engine

2007 Harley Davidson Street Rod Mirage Orange w/XR1200 wheels, Race Tech, True Track, Works Performance shocks

2007 Harley Davidson Street Rod Vivid Black stock

1993-ish K-100/1100RT/LT hemaphrodite frankenbike thingy to be painted satin black from a rattle can eventually
    

10Back to top Go down   Fork oil question Empty Re: Fork oil question Fri Mar 01, 2013 4:47 am

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@Themason wrote:Why do you need new discs? Those seldom wear out.

The book say that they are 5mm thick when new and the limit is 4.5mm, mine are less than 4mm thick. The bobbins for the floating discs are also very loose.

    

11Back to top Go down   Fork oil question Empty Re: Fork oil question Fri Mar 01, 2013 4:56 am

Guest

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The wear limit is 3.5mm if I remember correctly.

    

12Back to top Go down   Fork oil question Empty Re: Fork oil question Fri Mar 01, 2013 5:51 am

klompy the grey brick

klompy the grey brick
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is it stamped on the disc?


__________________________________________________
KKlompy Fork oil question 2854237993
"Grace" 1984 K100RS Silver VIN 0019026 Mitt eine Staintune Zorst.
"Olivia" 1997 K1100LT Dark Grey VIN WB1052600W0237453.









Chassis number0019026
Vehicle code0503
SeriesK589
ModelK 100 RS 83 (0502 ( 0503 )
Body typeK 100 RS 83 (0502
Catalog modelECE
Production date1984 / 07
Engine0513)

Fork oil question Au-log10


    

13Back to top Go down   Fork oil question Empty Re: Fork oil question Fri Mar 01, 2013 1:22 pm

Inge K.

Inge K.
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@Saxon7 wrote:The wear limit is 3.5mm if I remember correctly.
That's correct on a 2V model Fork oil question 112350 .

Bikerboy got a 4V, which got 1mm thicker discs....and a different wear limit.

Some members like to keep the signature field open...I'll guess the reason is
that they think every member of this forum likes a challenge....like remembering
which model every other member own...........


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

14Back to top Go down   Fork oil question Empty Re: Fork oil question Fri Mar 01, 2013 2:35 pm

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@Inge K. wrote:
@Saxon7 wrote:The wear limit is 3.5mm if I remember correctly.
That's correct on a 2V model Fork oil question 112350 .

Bikerboy got a 4V, which got 1mm thicker discs....and a different wear limit.

Some members like to keep the signature field open...I'll guess the reason is
that they think every member of this forum likes a challenge....like remembering
which model every other member own...........

Point taken and signature changed. I am not very good at this forum stuff and got the wife to do the signature for me.

I will run the discs as they are for now as I have not yet even ridden the bike. There has been so much work to do on it that I am getting worried that when I take it out on the road for the first time it may turn out to be a bag of nails! When it proves reliable and most things are working then I will spend £117 each and buy two new discs.

    

15Back to top Go down   Fork oil question Empty Re: Fork oil question Fri Mar 01, 2013 3:05 pm

Inge K.

Inge K.
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Well done Fork oil question 112350 , but it seems like it isn't quite correct yet.....your signature shows
only on your last post...it should be visible in all off your posts.

I'll guess you have added your signature under the information tab,
try to add it under the signature tab.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

16Back to top Go down   Fork oil question Empty Re: Fork oil question Fri Mar 01, 2013 5:03 pm

Guest

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It is under the signature tab, but as you say only shows in the posts since I made it. I prefer the technology of a big hammer than that of a keyboard or some RAM.

    

17Back to top Go down   Fork oil question Empty Re: Fork oil question Sat Mar 02, 2013 7:08 am

Inge K.

Inge K.
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It's probably me who remember wrong about thisFork oil question Idunno10......happens all the time.
Afterall you now got a signature..... Fork oil question 112350


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

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