BMW K bikes (Bricks)

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Rabidchiwawa007

Rabidchiwawa007
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Call me crazy, but this is my 2nd fork seal to go south in a few months, and I wonder if there may be some sort of correlation here.  I keep the weight on the bike balanced on both sides, so unless the k100s naturally ride in this way, something is up.  My front tire wears on the left side as if that's where it sits most the time.  The right fork seal is leaking (again, and a lot).

Here is a picture of the front tire, and you can see all the oil / dirt on the fairing in the background from the leak.

Uneven tire wear and fork seal leakage 88eJTx4
https://imgur.com/88eJTx4


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1968 BSA Lightning
1991 BMW K100RS 16v with K1100LT fairing
    

charlie99

charlie99
VIP
VIP
over filled ?

tyre wear looks about right for left hand side of the road drivers ....camber of the road !


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OUneven tire wear and fork seal leakage Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

K75cster

K75cster
Life time member
Life time member
some of that looks like scolloping from braking late, perhaps you have a feeling of greater confidence going into left handers? Just that little bit harder than the right handers over 10 to 18k miles can be that evident.I take it righthanders involve a gutter and the left a centreline? The fork seal with a sports braced forks, does require you to seat the forks whilst compressed then lock up the axle, even minor skewing of the fork might be sufficient to cause leakage, worth tinkering with to see if it stops.


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

Rabidchiwawa007

Rabidchiwawa007
Platinum member
Platinum member
I don't think it's overfilled, and I don't think it's being caused by a slight skewing of the forks as it's been fine for a few thousand miles.  

Also, 10-18k miles on a tire?! What are you using!  This is maybe 6-7k miles and that's a touring tire.  Anyways, right, I had forgotten abut road crowning and all that.  I'm thinking my next tire will be non-directional so I can just take it off and flip it around when it starts to wear a bit.  2x tire life then!


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1968 BSA Lightning
1991 BMW K100RS 16v with K1100LT fairing
    

charlie99

charlie99
VIP
VIP
crikey ....my sport demon on the front is well over 22000 kilometres and still not down to the wear markers

but I guess all you guys ride harder than this old goat


but I agree there is a settling procedure for lining up the forks ....wonder if one has a slight bend ?
did I see somewhere that there is a bush down on the fork sliders inside the bottom leg ..wonder if its worn a little ?


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OUneven tire wear and fork seal leakage Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

K75cster

K75cster
Life time member
Life time member
No man the seal wear might be fork alignment and worth a fiddle the tyre is more rider style or inflation level than a fork issue and we use kilometres here so stuffed that one up meself 10 to 18000klms on a shall we say entheuiasticlly riden bike, anyone want to buy a vowel seems i got more than needed maybe i should have said keenly riden

Oh maybe try a stringline the tyres treatment and see how they are related



Last edited by K75cster on Fri Jan 03, 2014 4:56 am; edited 1 time in total (Reason for editing : no not spell checking, more like a bright idea with a stringline)


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

RicK G

RicK G
admin
admin
I have seen a lot of that on chain drive bikes from bad alignment but not on BMWs. would pay to check the alignment, bit of a pain with the centre stand but it can be done and having 2more hands makes it a heap easier. Check your forks for vertical when centred as even a slight twist at the steering head will cause that.


__________________________________________________
"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
    

MikeP

MikeP
Life time member
Life time member
Well as you're going to need a new seal and a new tyre I'd ensure that the alignment is correct on reassembly before doing anything else.

Who replaced the seal last time? Who refitted the wheel after the last tyre change?


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1992 K1
1993 K1100R (used to be an LT)
    

Inge K.

Inge K.
VIP
VIP
Under the oil seal it's a stepped washer, if that is mounted wrong way it can cause a leak.


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

dutchie

dutchie
active member
active member
I dont think this is right, even without oil it must be the same hight.
Put some weight on the back of the bike en see what is happening.

Uneven tire wear and fork seal leakage Alignm11


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K75RT 1996 Uneven tire wear and fork seal leakage Klettern
K100RT 1986
    

RicK G

RicK G
admin
admin
Fairly normal with the wheel turned in that direction.


__________________________________________________
"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
    

AJ.Valente

AJ.Valente
Life time member
Life time member
Possible wheel bearing, is worth a check and replacement.


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'98 K1200RS Marrakesh Red

My old K100 RT Pics and Mods
    

sidecar paul

sidecar paul
Life time member
Life time member
I seem to remember RicK G advising against using Pyramid brand fork seals. Could your replacement have been one of theirs?

Just a thought.

Paul.


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

RicK G

RicK G
admin
admin
Yeah I found out the hard way and as many here have been saying for ages use the OEM seals they work best.


__________________________________________________
"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
    

Tenox

Tenox
Life time member
Life time member
It might just be that the pipes are so worn and/or have some damages on surface that new seals won't work any better than old ones. I have this issue on my bike.  Crying or Very sad New fork pipes are 400euros / per unit and it is too much for me, so I just clean up pipes after rides..

(I had a pair of OEM seals installed by professional mechanic last summer.)


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BMW K100RT Scrambler (86)
    

JGT

JGT
Gold member
Gold member
I have this problem with one stanchion, Showa forks, on my K75 and am going to try a two pack plastic metal to fill in the pin prick marks that have caused my seal damage, fit a new seal and hide behind gaiters, something that should be fitted by BMW during  manufacture. John


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1992 K75RT  1979 IZH Planeta3
    

Mike101

Mike101
Silver member
Silver member
Is it posible to fit fork gators to a K100LT.  I want to keep the winter road crap off the chrome.

Mike


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K100LT 1987 Gold and not Beige
XT660Z Tenere
    

RicK G

RicK G
admin
admin
Give these a go Mike they do the job and don't cost near as much as the ones Motobins are selling
http://www.amazon.com/Rancho-RS1952-Shock-Boot/dp/B000CPCCFY


__________________________________________________
"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
    

Comberjohn

Comberjohn
Life time member
Life time member
Have you checked Motorworks for reconditioned fork tubes?
They are offering them for £72 exchange per tube and will send them for a deposit until you return your old ones.
That's a lot less than €400 a side.
I could not get the original forks on my '84 to stop leaking. One side had a few pits but the other looked fine. Maybe just wear.
Picked up a perfect later set with the brace on eBay for about £60.
Handles better but a little on the firm side compared to the originals.


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Life is not a rehearsal.
2010 VFR 1200F DCT 
2010 R1200GS(gone)
1986 K100 Silver(gone)
2012 K1600GT(gone)
1984 K100RT Madison Silver(gone)
1989 K100LT Stratus Grey(gone)
1984 K100 Red(gone)
http://www.johnsdrivingschool.co
    

Rabidchiwawa007

Rabidchiwawa007
Platinum member
Platinum member
The forks currently on this bike are from a k1100 I think.  I replaced the original forks because when I took them off to replace a seal (on the same side), I found the shaft was pretty worn.  So I found this set on eBay for around $120 USD and they looked pretty good.  I installed them myself, unaware of that "install while compressed" thing which I still don't really understand.  I don't really understand how the fork could be twisted?  There's a bridge and the axle to make it stay straight in relation to the other one.  I feel that I might be misunderstanding something there.

After the installation of these forks, there were no leaks or issues for quite awhile, I'd guess around 4-5 months of daily commuting.

On a side note, I just ordered those gaiters that Rick posted.

Also, what happens if I run the fork with low or no oil.  Will it cause damage, or is it just a resistance change?


__________________________________________________
1968 BSA Lightning
1991 BMW K100RS 16v with K1100LT fairing
    

MikeP

MikeP
Life time member
Life time member
When you install the forks and the wheel it's possible to end-up with alignment problems if you just tighten everything without compressing the suspension once or twice.

Go back to basics.

The manual (BMW) guidance on tightening the axle bolts is, with the bike on the main stand and the front wheel raised, to tighten the axle end bolt and then the left side axle pinch bolts. Take the bike off the stand. Compress the forks a couple of times. Bike back on the stand and then tighten the right side axle pinch bolts.

If I have disturbed the fork brace, I do the above first before tightening it. The brace needs to be working with the correct front axle alignment, not against it (which can be the case if the brace is tightened first).


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1992 K1
1993 K1100R (used to be an LT)
    

Rabidchiwawa007

Rabidchiwawa007
Platinum member
Platinum member
Ohhhhh oh yes, of course.  Yes, I did that when I installed the forks.  I was over thinking what was described earlier in the thread.  I had it in my head somehow that he meant the forks had to be held in the compressed position during installation.  Silly me Rolling Eyes


__________________________________________________
1968 BSA Lightning
1991 BMW K100RS 16v with K1100LT fairing
    

RicK G

RicK G
admin
admin
The forks like any other mechanical contraption need lubrication so without it they will wear very quickly and be damaged beyond repair.


__________________________________________________
"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
    

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