BMW K bikes (Bricks)


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1Back to top Go down    Forks seals question. on Wed Jul 27, 2016 5:52 pm

Crazy Frog

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Today I decided to remove the fork on the K100 solo to replace the seals.
I didn't have to remove the fairing (just the front radiator grill in order to slack the bolts on the bottom triple tee).
When the forks were on the bench, it was very easy to get the stancion out. I just removed the screw at the bottom of the slider and the stancion came out very easy.
Now it's time to get new seals but I am in a bind. Embarassed
As I don't have a BMW dealer close from home, the seals will have to be ordered.
Which ones as BMW had different types of forks over the years?

According to the S/N (0051114) the bike is a 09/1984 K100rt USA and the seal part # would be 31 42 1 450 127
The fork is marked "Brembo 1.450.520" and I took some dimensions:
Stancions diameter: 41.38mm
Bore diameter of the sliders: 50.88mm
Depth of the bore on the sliders: 6.85mm

Does anybody has the same fork and can confirm the part # for the seals?


Thanks

CF


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1986 k75, 1985 K100rt, 1985 K100rt/EML sidecar.
    

2Back to top Go down    Re: Forks seals question. on Wed Jul 27, 2016 6:36 pm

Inge K.

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@Crazy Frog wrote:According to the S/N (0051114) the bike is a 09/1984 K100rt USA and the seal part # would be 31 42 1 450 127

That is a old part #, new part # is 31 42 1 451 478.
All Fichtel & Sachs forks using the same fork seal.


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

3Back to top Go down    Re: Forks seals question. on Wed Jul 27, 2016 6:43 pm

Crazy Frog

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@Inge K. wrote: That is a old part #, new part # is 31 42 1 451 478.
All Fichtel & Sachs forks using the same fork seal.

Thanks Inge,

Sorry to be a bugger, but the fork is marked as a Brembo and not Fitchel or Sachs.
Is this number good for Brembo too?

Thanks,

Bert


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1986 k75, 1985 K100rt, 1985 K100rt/EML sidecar.
    

4Back to top Go down    Re: Forks seals question. on Wed Jul 27, 2016 7:01 pm

Inge K.

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The early forks have always had the name Brembo stamped on the sliders.
But everywhere and as long as I remend remember What a Face they have always been designated as Fichtel & Sachs (or BMW fork on a few Places).
So I follow the mainstream and use that name, so everybody knows what I'm talking about :suspect: .


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

5Back to top Go down    Re: Forks seals question. on Wed Jul 27, 2016 7:40 pm

Crazy Frog

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@Inge K. wrote:The early forks have always had the name Brembo stamped on the sliders.
Thanks a lot Inge.
This clears a lot of questions to everybody.

Cheers,

Bert


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1986 k75, 1985 K100rt, 1985 K100rt/EML sidecar.
    

6Back to top Go down    Guru on Sat Jul 30, 2016 10:02 pm

Cablebeacher


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Hi all

Especially Bert! I was gobsmacked to see you ask a question! I thought and have been led to believe you knew absolutely everything!

I supposed NOW you do know everything as you have the seals issue sorted...

Hahaha

Regards

Mal

    

7Back to top Go down    Re: Forks seals question. on Sat Jul 30, 2016 10:29 pm

Crazy Frog

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@Cablebeacher wrote:Especially Bert! I was gobsmacked to see you ask a question!
If I knew everything, life would be very boring.
With age the memory starts to (very) slowly fail and I even sometimes have to read what I previously wrote . I replaced these seals about 8 years ago, but could not remember the reference. The fact that BMW had different manufacturers for the forks could be at time very confusing. the original seal # was replaced twice since the bike was produced.
Oh by the way, I know people who tried to save money and bought industrial fork seals. THEY DIDN'T LAST. Get the genuine BMW ones.
We have a lot of knowledgeable people on the forum and help is greatly appreciated.
Other will benefit from my question and Hinge's answer :BW: .


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1986 k75, 1985 K100rt, 1985 K100rt/EML sidecar.
    

8Back to top Go down    Too true on Sat Jul 30, 2016 10:57 pm

Cablebeacher


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Hi Bert

Too true! Sometimes cheap alternatives are not "cheap: after all.

Regards & best wishes

Mal Very Happy

    

9Back to top Go down    Re: Forks seals question. on Sun Jul 31, 2016 12:46 am

RicK G

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I put some Pyramid brand seals off Ebay and dived head first into a large pothole but going slowly and turned one seal inside out. I always buy genuine now. charlie will remember the pothole well he just about disappeared in it before I hit it.


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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
    

10Back to top Go down    Re: Forks seals question. on Sun Jul 31, 2016 5:10 am

charlie99

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yep remember that trip quite well

road tyres on a particularly rough dirt road ...the recent rains flushed the dirt infill away making an slippery and rough stone exposed challenge ...grin ...

old Gerty made it there and back a few times since ...always best to get the good ones !!


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'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

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