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1Back to top Go down   Front suspension Empty Front suspension Mon Oct 01, 2012 7:50 am

BillOwens

BillOwens
active member
active member
Just had our club inspector pass bike for classic rego
He felt the front suspension seemed soft, ie it would dive under front braking
Can it be stiffened, it certainly is softer than the Ducati

http://www.wdmoc.com
    

2Back to top Go down   Front suspension Empty Re: Front suspension Mon Oct 01, 2012 8:28 am

Guest

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Hello Bill,
If you do a search you'll find plenty of discussion on this topic.
Yes, the front suspension is a bit soft or perhaps better known as compliant.
First thing to do is change the fork oil. It may have been in there since Moses played fullback for Jerusalem.
Then work from there...progressive springs etc.
It's a good idea to put your bike model and year in your signature.

Sean.

    

3Back to top Go down   Front suspension Empty Re: Front suspension Mon Oct 01, 2012 8:38 am

Rick G

Rick G
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They are very touchy on the grade of oil some use 5SAE and 7.5 or 10 and some even mix grades to their liking but anything over 10 weight usually rattles the bones a bit.


__________________________________________________
"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
    

4Back to top Go down   Front suspension Empty Re: Front suspension Mon Oct 01, 2012 8:47 am

88

88
Life time member
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+1 what the guys say Bill.

When I got my LT the fork dive was waaay to much for my liking. I replaced the fork oil with 10w (IIRC) and the difference meant that I could put all thoughts of spring replacement aside.

Here's a recent thread on the subject with some handy tips.


88


__________________________________________________
Front suspension Ir-log1188....May contain nuts!Front suspension Ir-log11

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

K1 - 1989 - AKA Titan (unique K1/K1100RS hybrid by Andreas Esterhammer)
K1100RS - 1995. AKA Rudolf Von Schmurf (in a million bits)
K100RS - 1991 AKA Ronnie. Cafe racer project bike
K75RTP - 1994
K75C - 1991 AKA Jim Beam. In boxes. 
K1100LT 1992 - AKA Big Red (gone)
K100LT - 1988 - AKA the Bullion brick. Should never have sold it.
    

5Back to top Go down   Front suspension Empty Re: Front suspension Mon Oct 01, 2012 12:03 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
I've retrofitted the K75S 'S' front forks to my K100RS. The difference in feel (and reduced suspension travel) is amazing; they are much firmer than the typical long travel front suspension. The 'S' forks use only 280cc of fork oil and the weight I decided upon after trying all weights is 5W. I weigh less than 85kg dressed for the sunshine in a sudden downpour.

Using 10 or 15W oil can help but often it's a matter of not enough fluid in the forks in the first place. I recommend a flush and refill with the correct level spec to see how much it changes. Barring that, some Progressive springs or replacement with the OEM might make a difference.


__________________________________________________
"How many cars did we pass today?" "ALL of them."
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

6Back to top Go down   Front suspension Empty Front suspension Wed Oct 03, 2012 6:27 am

BillOwens

BillOwens
active member
active member
Will do a drain and refill this weekend, is 360 ml per fork correct
Is there an easy way of getting the new oil in?
Should I use my compressor to blow all the old stuff out?


__________________________________________________
1984 BMW K100 RS black,90,000km, 1982 Ducati Pantah 600SL 2,000km since restoration, 1949 Velocette Mac 350, undergoing restoration
http://www.wdmoc.com
    

7Back to top Go down   Front suspension Empty Re: Front suspension Wed Oct 03, 2012 7:10 am

Rick G

Rick G
admin
admin
Use a bit of aluminium foil to keep the oil away from the discs and remove the top bung then the bottom bung as there is often pressure in there. You will need a gas mask , it will stink.
I use a big 100ml syringe to put the oil in the top and measure it, got it from a vet.


__________________________________________________
"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
    

8Back to top Go down   Front suspension Empty Re: Front suspension Wed Oct 03, 2012 7:10 am

rosskko

rosskko
VIP
VIP
Not sure about the compressor, but use a horse syringe. Takes a few to get it all in, but you won't spill any.
I tried a pvc hose and funnel. If you have a really small diameter hose it is ok, but the air obviously needs to get out.


__________________________________________________
1986 K100RT VIN 0093801K100RT with summer fairing for a northern visitor

Basic/2 6308802K100CJ  05/1988

K1100RS 0194321
    

9Back to top Go down   Front suspension Empty Re: Front suspension Wed Oct 03, 2012 8:49 am

charlie99

charlie99
VIP
VIP
bill there is usually enough suction to work the oil out the bleeder holes at the bottom with a few pumps of the front end on the handle bars .

our good friend inge posted a fantastcic tool for keeping the oil from blowing all over the forks disks et all ... durring the empty process

its a cut up bottle ...hope i can find the pic again (might have to use the search feature )


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

10Back to top Go down   Front suspension Empty Re: Front suspension Wed Oct 03, 2012 9:00 am

Inge K.

Inge K.
VIP
VIP
It was in a thread where RT was changing his fork oil.
And did find one of the drain holes clogged,...or was the leg empty......?

Front suspension Drener10

Front suspension Drener11



Last edited by Inge K. on Wed Oct 03, 2012 9:06 am; edited 1 time in total (Reason for editing : Adding pictures.)


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

11Back to top Go down   Front suspension Empty Re: Front suspension Wed Oct 03, 2012 9:10 am

rosskko

rosskko
VIP
VIP


__________________________________________________
1986 K100RT VIN 0093801K100RT with summer fairing for a northern visitor

Basic/2 6308802K100CJ  05/1988

K1100RS 0194321
    

12Back to top Go down   Front suspension Empty Re: Front suspension Wed Oct 03, 2012 12:57 pm

Motorandy123

Motorandy123
active member
active member
I recently installed some K100 springs that I cut down by 2" to get the appropriate
stiffness. According to Racetech the stockers are 0.72 kg/mm and 0.80 to 0.85 would
be best. I threw in some lightly thicker oil (10 w) to bring the rebound back and she
should be all set!

    

13Back to top Go down   Front suspension Empty Fork oil change Sun Oct 07, 2012 8:14 am

BillOwens

BillOwens
active member
active member
Drained both forks, still oil but watery and probably 200ml per side
Put 360ml sae10 per side. No leaks yet, rides well
Also got 2 nd hand mount for the broken one that came with it


__________________________________________________
1984 BMW K100 RS black,90,000km, 1982 Ducati Pantah 600SL 2,000km since restoration, 1949 Velocette Mac 350, undergoing restoration
http://www.wdmoc.com
    

14Back to top Go down   Front suspension Empty Re: Front suspension Sun Oct 07, 2012 8:35 am

charlie99

charlie99
VIP
VIP
good work bill ...amazing what fresh oil does for the ride

happy times ol mate !


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

15Back to top Go down   Front suspension Empty Re: Front suspension Sun Oct 07, 2012 9:49 am

Rick G

Rick G
admin
admin
Bill if your seals have been leaking (I am not sure if they were) check the radiator as the oil gets there and collects dust and clogs the fins on the outside.


__________________________________________________
"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
    

16Back to top Go down   Front suspension Empty Re: Front suspension Sun Oct 07, 2012 9:59 am

Inge K.

Inge K.
VIP
VIP
Good advice,......as always.


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

17Back to top Go down   Front suspension Empty Front forks Mon Oct 08, 2012 6:14 am

BillOwens

BillOwens
active member
active member
Thanks for the advice Rick, will check asap


__________________________________________________
1984 BMW K100 RS black,90,000km, 1982 Ducati Pantah 600SL 2,000km since restoration, 1949 Velocette Mac 350, undergoing restoration
http://www.wdmoc.com
    

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