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K100-forum.com » Technical, repair and troubleshooting » Frame, fairing and wheels » Fork oil grading

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1Back to top Go down   Fork oil grading Empty Fork oil grading Fri Aug 02, 2013 8:00 am

coopz

coopz
active member
active member
Just about to change fork oil first time for me with the BM and wondering if anyone has mixed their own. I've used previously 10/30 motor oil 50/50 with transmission fluid grade is around 10 I think would just trans oil be ok as I've used this many time in XS 1100 bikes with no trouble Coopz


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1985 K100 RS
    

2Back to top Go down   Fork oil grading Empty Re: Fork oil grading Fri Aug 02, 2013 8:24 am

Rick G

Rick G
admin
admin
The BMWs are very touchy on the grade of oil used in the forks. I have used auto trans fluid but it comes up a bit hard. Most of the guys here seem to use the fork oil from bike shops and 5 or 7.5 and some use 10 it is just a matter of what feels right.


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

3Back to top Go down   Fork oil grading Empty Re: Fork oil grading Fri Aug 02, 2013 8:54 pm

japuentes

japuentes
Life time member
Life time member
Hi there, for pothole infested roads 10 is too hard and ATF will bend your rims, 5 works fine.
Best regards
JAP


__________________________________________________
Fork oil grading 2854237993 1988 K100RS SE/ABS
    

4Back to top Go down   Fork oil grading Empty Re: Fork oil grading Sat Aug 03, 2013 7:48 am

Guest

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Guest
I used 7.5 as I was not sure what to put in, but I am happy with it.

    

5Back to top Go down   Fork oil grading Empty Re: Fork oil grading Sat Aug 03, 2013 8:54 am

Rick G

Rick G
admin
admin
japuentes wrote:Hi there, for pothole infested roads 10 is too hard and ATF will bend your rims, 5 works fine.
Best regards
JAP
Sounds like your roads are as bad as the roads here.


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

6Back to top Go down   Fork oil grading Empty Re: Fork oil grading Sat Aug 03, 2013 9:45 am

Guest

avatar
Guest
I tried 10 and changed to 5. It seems to work for me.

    

7Back to top Go down   Fork oil grading Empty Re: Fork oil grading Mon Aug 05, 2013 11:32 pm

k75RT Keith

k75RT Keith
Silver member
Silver member
Running 7.5 in my RT.  Had 15wt in the fork and it was like having no suspension.  

It should be noted that fork oil weight ratings are not standardized or regulated.  That is to say there is a very wide range within a specific weight.  One brand of 10wt may be heavier than another.

    

8Back to top Go down   Fork oil grading Empty Re: Fork oil grading Mon Aug 05, 2013 11:56 pm

Basic2

Basic2
Platinum member
Platinum member
I'm using Motul 10W in my Basic/2 and it seems a good balance for me.


__________________________________________________
K100 Basic 2
11/1987 6308319K100CJ
Marakesh Red
    

9Back to top Go down   Fork oil grading Empty Re: Fork oil grading Tue Aug 06, 2013 8:46 am

zonenfeile

zonenfeile
Gold member
Gold member
7,5 for the 75
10 for the 100
5,0 : to be used for salad only


for final adjustment:  +/-  10-20ml 

best results with that if "comfort" is still wanted


__________________________________________________
ex K1100/2

K- Wiki - or rtfm first

Regards from Hamburg

Olaf
    

10Back to top Go down   Fork oil grading Empty Re: Fork oil grading Tue Aug 06, 2013 10:28 am

Rick G

Rick G
admin
admin
Fork oil grading 44271 Fork oil grading 44271


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

11Back to top Go down   Fork oil grading Empty Re: Fork oil grading Tue Aug 06, 2013 11:22 am

Kioors

Kioors
active member
active member
Using 10W on my RS too.

First time I put new oil in the forks, I was still a bit daft, and filled 'm right up. Next I rode out trough the gutter into the street and had a bit of an ego-dent as my father stared laughing out loud... 🤡 Rolling Eyes 

=> measure! It works best with a big syringe, since the oil doesn't stick in it, and you don't pour it all over the garage floor.


__________________________________________________
1989 K100RS 16v
1991 K100RS 16v - For sale
1993 Ducati 750 SS - For sale
1992 Ducati 907i.e.
    

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