BMW K bikes (Bricks)

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1Back to top Go down   sports forks Empty sports forks on Thu Jul 09, 2015 2:59 pm

smoll1

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Hi all

I have a question that hope someone can help with.

I have k100rs style the black and red special edition model.

It has the same sports fork which are also on k75s and are stamped s on the top.

I have changed the fork seals and new oil.

The question is i have put oil in and the right hand fork appears to have less damping. 

I read on a few post that these forks only damp in the left leg. 

Is this right as a bit worried now its the right leg that has less damping.

Hope someone can help 

Smoll

    

2Back to top Go down   sports forks Empty Re: sports forks on Thu Jul 09, 2015 6:54 pm

Ringfad

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I also have one of these, so glad to hear another one still survives.

I use 280cc per leg as described in the following  link

https://www.k100-forum.com/t1439-forks-and-oil

My K1100RS does use different amounts of oil per leg but this should not be the case for your K100RS 8V with Sports forks.


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sports forks Ir-log10

   ;BMW; K100RS Style Black 1987 105K Km     ;BMW; K1 Black 1993 51K Km     ;BMW; K1100RS Red 1993 60k miles   ;BMW; K100 16V Black (ex ElectricMonk)  ;BMW;  K1100LT (Swiss) now a RS
    

3Back to top Go down   sports forks Empty Re: sports forks on Thu Jul 09, 2015 8:53 pm

RicK G

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AFAIK the only bricks that have different damping in each leg is the K1100 and they have rebound in one and compression damping in the other.


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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
    

4Back to top Go down   sports forks Empty Re: sports forks on Fri Jul 10, 2015 1:02 pm

Snod Blatter

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One of them has massive rebound damping, as far as I can remember they are the same in regards to compression damping. I think I set the same air gap in both but whatever it was it was too hard, now that some has thankfully spewed out (like they all seem to do) it's nice and soft again Rolling Eyes


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1989 K100RS SE ABS 8v  VIN: 0149214
Others: 1.5 x Honda CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL
http://justbikethings.blogspot.co.uk/
    

5Back to top Go down   sports forks Empty sports forks on Fri Jul 10, 2015 2:11 pm

smoll1

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Hi all

I stripped the problem leg down and all looks as it should but still little compression damping. Any thoughts what might be causing this. I have the correct 280 of oil. Bit at loss. Help:no:

Thanks.for the replies.

    

6Back to top Go down   sports forks Empty Re: sports forks on Fri Jul 10, 2015 2:18 pm

Snod Blatter

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Little compression damping as in you can slam it together without a spring in there?

I don't think they have a whole lot of compression damping, it only becomes apparent when the spring is in and the air is trapped inside. But of course then they are very difficult to test by pretending it's a pogo stick, unless you weigh many kilos!


__________________________________________________
1989 K100RS SE ABS 8v  VIN: 0149214
Others: 1.5 x Honda CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL
http://justbikethings.blogspot.co.uk/
    

7Back to top Go down   sports forks Empty Re: sports forks on Fri Jul 10, 2015 8:12 pm

AL-58

AL-58
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lighter oil = less damping.  Perhaps the previous fill used a heavier grade than what you are using.

Al


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'87 K100RS/HRD sidecar (1100 motor)  sc25 
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

sports forks K-dogs10
    

8Back to top Go down   sports forks Empty Re: sports forks on Sun Jul 12, 2015 5:48 pm

Two Wheels Better

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Did you have any resolution, Smoll1?

I have retrofitted the 'S' forks to my OZ-based K100RS (five or so years ago now) and immediately loved the difference from the long-travel, plushy ride forks it came stock with. Combined with a firm as Bitubo (Eye-talian) rear shockie it is stable but still edgy and follows the road
como el comando Dioses moto (as the moto Gods intended). I use 280cc of 5W oil in each tree trunk to retain some suppleness over the ripply bits. The springs inside are still OEM.


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“Some people see things that are and ask, ‘Why?’. Some people dream of things that never were and ask, ‘Why not?’. Some people have to go to work...

~George Carlin

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.

    

9Back to top Go down   sports forks Empty Re: sports forks on Thu Jul 16, 2015 9:01 am

japuentes

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@Two Wheels Better wrote:Did you have any resolution, Smoll1?

I have retrofitted the 'S' forks to my OZ-based K100RS (five or so years ago now) and immediately loved the difference from the long-travel, plushy ride forks it came stock with. Combined with a firm as Bitubo (Eye-talian) rear shockie it is stable but still edgy and follows the road
como el comando Dioses moto (as the moto Gods intended). I use 280cc of 5W oil in each tree trunk to retain some suppleness over the ripply bits. The springs inside are still OEM.
Ja ja, nice try, we would say "como dios manda"
Best regards
JAP


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sports forks 2854237993 1988 K100RS SE/ABS
    

10Back to top Go down   sports forks Empty Re: sports forks on Thu Jul 16, 2015 9:19 am

Two Wheels Better

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And so would I, but for the plural...


__________________________________________________

“Some people see things that are and ask, ‘Why?’. Some people dream of things that never were and ask, ‘Why not?’. Some people have to go to work...

~George Carlin

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.

    

11Back to top Go down   sports forks Empty sports forks on Thu Jul 16, 2015 11:53 am

smoll1

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Hi

Havent had chance to look at yet am off work for couple weeks so will let you know how it goes Very Happy

    

12Back to top Go down   sports forks Empty Re: sports forks on Thu Jul 16, 2015 11:26 pm

japuentes

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@Two Wheels Better wrote:And so would I, but for the plural...

Yes I noticed, but I guess due to our catholically influenced folklore,in our sayings we never refer to many gods, only one.


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sports forks 2854237993 1988 K100RS SE/ABS
    

13Back to top Go down   sports forks Empty sports forks on Fri Jul 17, 2015 6:17 am

smoll1

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Stripped down forks still get no resistance when i push up and down.

If the plastic sealing ring on top of the damper rod is faulty do you think this might be causing the problem? All the rest of the parts appear to be in ok condition.

Smoll

    

14Back to top Go down   sports forks Empty Re: sports forks on Fri Jul 17, 2015 6:23 am

Inge K.

Inge K.
VIP
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It isn't any valve components for the damping in the RHS leg on the sport fork.


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

15Back to top Go down   sports forks Empty Re: sports forks on Fri Jul 17, 2015 11:30 am

Two Wheels Better

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@japuentes wrote:
@Two Wheels Better wrote:And so would I, but for the plural...
Yes I noticed, but I guess due to our catholically influenced folklore,in our sayings we never refer to many gods, only one.
Entiendo, but I have no such bonds. Pero, necesito practicar mi Espanol. Please pardon my casual re-interpretation.

A long time ago I had a summertime relationship with a sweet Mexican-American girl, the daughter of a Spanish diplomat and a Mexico consulate employee in L.A. She spoke English with no accent but her 'Spanglish' irritated her father, who insisted she speak Spanish 'como Dios manda'. I never forgot that very useful phrase.

sports forks Castan10
Not my Melindita Garcia-Cox, but close!

                               ***********************
 
Back to the 'S' forks, I always knew they had separate functions, but more specifically, I had only a vague idea that one of them did the damping part of the show, but knew that both were sprung.


__________________________________________________

“Some people see things that are and ask, ‘Why?’. Some people dream of things that never were and ask, ‘Why not?’. Some people have to go to work...

~George Carlin

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.

    

16Back to top Go down   sports forks Empty sports forks on Sat Jul 18, 2015 8:56 am

smoll1

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If only one fork has damping it must be ok. I will put back together and put on bike and see what like. I think as is was special edition bike with brembo sports fork same as k75s all the written information about them is different. Hopefully it will be ok. I got confused as i emailed bmw and they said the bike damped on both legs. I took them apart and as was said above their are no damping parts inside.

Thanks for comments

    

17Back to top Go down   sports forks Empty Re: sports forks on Sat Jul 18, 2015 4:56 pm

Inge K.

Inge K.
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@smoll1 wrote: I got confused as i emailed bmw and they said the bike damped on both legs.

It seems like they didn't check it good enough..............

sports forks Sport_10


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

18Back to top Go down   sports forks Empty sports forks on Sat Jul 18, 2015 5:04 pm

smoll1

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Thanks for that info wish bmw knew what they were doing haha. I take it the tea boy answered my email.

Thanks again that help alot.

Smoll:D:D

    

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