BMW K bikes (Bricks)

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1Back to top Go down   Short fork travel Empty Short fork travel on Sun Apr 13, 2014 1:50 pm

Comberjohn

Comberjohn
Life time member
Life time member
I bought a pair of forks from eBay last year as I couldn't keep oil in the originals.
They are the correct diameter, 41.3mm, and have the cast bridge and two piece guard.
At first I thought they were nice and firm and improved the handling. But lately I'm finding them hard work and spend most of my time avoiding manhole covers and anything above a few mm in height.
When I arrived home today after doing a couple of hundred miles, I measured the amount of travel between the rubber cap and the high tide mark.
It was only 40mm!
Dug out my originals and just pushing one down was able to get 90mm travel. It's really starting to put me off covering too many miles. The fairing is jumping about so much, I'm concerned that it's going to break a mounting (again).
I recently changed the oil and put 10w in thinking the PO had put really heavy oil in. Made no difference.
There doesn't appear to be an 'S' stamped anywhere either.
Not sure where to go from here. Looks like I need to change the springs or take out a spacer(?).
Comments please before I break out the spanners and wallet.


__________________________________________________
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
    

2Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 2:12 pm

Inge K.

Inge K.
VIP
VIP
It all points in direction "Sport fork", the "S" should be stamped beside the filler plug.

But you also did get all parts needed as a retrofit kit, and then have to make this "S"
beside the filler plug yourself.


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

3Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 2:16 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Some aftermarket springs, Progressive-brand for one, are meant to be preloaded, and often are shorter than the originals, and come with a length of PVC which is cut to length for application. Some folk wrestle the entire piece in which often results in a too-stiff spring.

It's important to know what version of fork you have as there are several oil capacity specs between the various early K models. The K75 'S' forks which I retrofitted into my K100RS take just 280cc per leg and this level rides to 440cc for other bikes/models. Far too much oil in the space will also result in a harsh ride and often blown out fork seals as well. One of the members published a chart some time ago showing how much oil goes into each models front suspension...


__________________________________________________

“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.

    

4Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 2:30 pm

Inge K.

Inge K.
VIP
VIP
One way to confirm......take one leg of the bike, turn it upside down...
remove the bottom screw (support the stanchion, if you put the slider in the vice).

The sport fork have a 8 X 70 mm screw (due to a 50 mm spacer inside)
a ordinary fork would have a 8 X 20 mm screw.

Have a new crush washer ready.


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

5Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 2:41 pm

duck

duck
Life time member
Life time member


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

6Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 3:29 pm

sidecar paul

sidecar paul
Life time member
Life time member
Hi John, many years ago I bought some progressive springs for my solo. They came with 2 spacers which I fitted, but they were far too stiff. I seem to remember that the spacers were something like 3 inches long. After a couple of spacer shortening sessions, I eventually got the forks working sensibly.
By taking the fork top fitting off, you should be able to see if there is a spacer in there, it goes on top of the spring.

If (and it's a big if) that's the problem, then it's easy to fix.
Good luck,
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!
    

7Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 3:33 pm

Inge K.

Inge K.
VIP
VIP
The sport fork got two springs in each leg, and a spacer between.


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

8Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 4:14 pm

Comberjohn

Comberjohn
Life time member
Life time member
Definitely no 'S' stamped on the fork cap so think I can rule out the Sport option for the time being.
The forks were manufactured in 86 and 87 and the markings look like BMW rather than Showa. That would seem to indicate from the table that duck provided, that the oil capacity should be 330 or 360cc depending on being from a K75 or K100. I have 360cc in them and not convinced that such a small difference would reduce the travel by so much. Have been wrong before though.
Starting to look like the over long spacer with new progressive springs is the favourite. I seem to remember that the PO of the forks had bought them for his 16v and they wouldn't fit. But he said that they had been sold to him as refurbished. New seals and springs perhaps? 
Time to have a closer look.
Advice on removing springs, please.
How do you get the top off and do the forks have to be removed first?


__________________________________________________
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
    

9Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 4:26 pm

sidecar paul

sidecar paul
Life time member
Life time member
John, you can get at the springs without removing the fork legs.
To remove the top plug, push it downwards until you can get at the retaining circlip.

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!
    

10Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 4:39 pm

duck

duck
Life time member
Life time member
A wheel/gear puller makes getting th aluminum fork caps off easier:

Short fork travel Fork_c10


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

11Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 4:56 pm

Snod Blatter

Snod Blatter
Life time member
Life time member
If you have a helper handy (Thankfully I have a bored Dad floating around) it's not too difficult with two people, one person shoves down on the cap (probably with a T-bar pressing an allen bit in the bolt) and the other can shove the stanchion upwards to stop the cap taking it down with it, and then pluck the clip out. The cap has to go about an inch below the top of the stanchion, really impossibly difficult by yourself unless you have a tool to help like duck says.


__________________________________________________
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/
    

12Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 5:31 pm

Comberjohn

Comberjohn
Life time member
Life time member
Hmmm. Think I qualify as the bored dad now.
That's a job for tomorrow evening. If it is the spacer, sounds like it could take an eye out if you aren't careful.


__________________________________________________
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
    

13Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 5:50 pm

AL-58

AL-58
Life time member
Life time member
Rather than too long a spacer, I'd be thinking no spacer at all where one should have been fitted.  Perhaps a short owner may have done this to compensate?

You say there is only 40mm travel available.  If a spring is meant to have a spacer to get the correct travel, a longer spacer will give the forks more travel (and will not make the spring harder, just higher).  If someone chose to fit no spacer, there is less travel available).

Al


__________________________________________________
'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"

Short fork travel K-dogs10
    

14Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 5:57 pm

Comberjohn

Comberjohn
Life time member
Life time member
Get your point, Al. But that would mean that the bike would be nearer the ground and, unless my legs really are getting shorter, I would probably notice it.
Think surgery is the only answer. That's the bike, not my legs.


__________________________________________________
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
    

15Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 6:05 pm

duck

duck
Life time member
Life time member
@Comberjohn wrote:Definitely no 'S' stamped on the fork cap so think I can rule out the Sport option for the time being.
The forks were manufactured in 86 and 87 and the markings look like BMW rather than Showa. That would seem to indicate from the table that duck provided, that the oil capacity should be 330 or 360cc depending on being from a K75 or K100. I have 360cc in them and not convinced that such a small difference would reduce the travel by so much. Have been wrong before though.
Starting to look like the over long spacer with new progressive springs is the favourite. I seem to remember that the PO of the forks had bought them for his 16v and they wouldn't fit. But he said that they had been sold to him as refurbished. New seals and springs perhaps? 
Time to have a closer look.
Advice on removing springs, please.
How do you get the top off and do the forks have to be removed first?

30 ccs of fork oil can make a big difference. Because part of that volume is taken up by the spring itself.  I had a K100RS4V once that rode like a jackhammer on the freeway. I drained 10 ccs from each fork and that made it much better.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

16Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 6:17 pm

Comberjohn

Comberjohn
Life time member
Life time member
Jackhammer is a perfect description of it.
Do you really think dropping it to 330cc would make that much difference?
40mm or inch and a half movement is hard going on anything other than a really smooth road.
Back to the K golden rule. Try the simple(and cheap) fixes first.


__________________________________________________
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
    

17Back to top Go down   Short fork travel Empty Re: Short fork travel on Sun Apr 13, 2014 6:52 pm

duck

duck
Life time member
Life time member
That's what I'd try first. (It's really not the volume of fork oil that matters but the volume of air in the fork as air is much more compressible.)


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

18Back to top Go down   Short fork travel Empty Re: Short fork travel on Mon Apr 14, 2014 7:03 pm

Comberjohn

Comberjohn
Life time member
Life time member
Looks like duck hit the nail on the head.
I drained the forks this evening and pushed the bike forward with the front brakes applied. Using a cable tie around the fork tube I measured 140mm travel instead of 40mm.
So looks like the springs aren't to blame.
Question now is how much oil should I put in?
Definitely no 'S' stamped on them and don't think they are Showa. I'm guessing that they are BMW and from a K75 or K100.
Using duck's table, I think 330cc rather than the 360cc that I had used.
What does the panel think? Would that be the answer?
10 or 7.5w oil?


__________________________________________________
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
    

19Back to top Go down   Short fork travel Empty Re: Short fork travel on Mon Apr 14, 2014 9:47 pm

japuentes

japuentes
Life time member
Life time member
Hi there, as per my experience and the Haynes indications, 10 is too much for real, pothole infested, roads. I am using 5.
Best regards
JAP


__________________________________________________
Short fork travel 2854237993 1988 K100RS SE/ABS
    

20Back to top Go down   Short fork travel Empty Re: Short fork travel on Tue Apr 15, 2014 12:31 am

duck

duck
Life time member
Life time member
I use Honda SS-8 (which is a 10W) in all of my Ks.

From what I've heard on fork oils, they are not standardized so 10W from one vendor may not be the same as 10W from another vendor. 

I'd go with 330 ccs.  Just add more later if the front dives or feels too soft.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

21Back to top Go down   Short fork travel Empty Re: Short fork travel on Tue Apr 15, 2014 12:56 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
And in my 'S' forks and because I'm not too heavy, I use 5W. It helps make them more supple over the ripply bumps. 10W works ok too.


__________________________________________________

“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.

    

22Back to top Go down   Short fork travel Empty Re: Short fork travel on Tue Apr 15, 2014 5:47 am

charlie99

charlie99
VIP
VIP
7.5 is a good compromise for good roads ...have mixed 30 % with 10 weight ...not so good on pot holey roads  but liveable

past due for replacement in gerty


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

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

23Back to top Go down   Short fork travel Empty Re: Short fork travel on Tue May 06, 2014 5:29 pm

Born Again Eccentric

Born Again Eccentric
Life time member
Life time member
@Comberjohn wrote:Looks like duck hit the nail on the head.
I drained the forks this evening and pushed the bike forward with the front brakes applied. Using a cable tie around the fork tube I measured 140mm travel instead of 40mm.
So looks like the springs aren't to blame.
Question now is how much oil should I put in?
Definitely no 'S' stamped on them and don't think they are Showa. I'm guessing that they are BMW and from a K75 or K100.
Using duck's table, I think 330cc rather than the 360cc that I had used.
What does the panel think? Would that be the answer?
10 or 7.5w oil?
Comberjohn,

Any update on your fork oil dilemma? Did you opt for 330ml/fork or did you go for a lighter weight oil....or a bit of both? How does the ride feel now?

Reason I ask....I changed my fork seals about 10 days ago (I'd noticed the left one was leaking) and refilled with fresh fork oil (Castrol 10W), filling each fork with exactly 360ml as per Ducks table and the Haynes manual etc for a K100LT. Since then, while it is satisfyingly leak tight, the ride has become very hard - your description of jack hammer and avoiding the slightest bumps (easier said than done) sums it up pretty well. This is a big change from how the bike felt before. 

Incidentally, when I replaced the fork seals, I removed the forks from the bike but did not dismantle them so I know that I have not disturbed the springs or inadvertently removed any spacers etc so I am certain it is either oil weight or oil level that has brought about the dramatic change.

I have just ordered up some Castrol 5W fork oil from Amazon but would be interested to hear your views before I go and change the oil again. Failing that I will take Ducks advice and start with 330ml/fork and see how that improves the ride comfort


__________________________________________________
Short fork travel Uk-log10 Short fork travel Sco-lo15Short fork travel Eu-log10
                              Paul  Short fork travel 905546712

"Heidi" K100LT 1991 (Grey) (VIN 0190172 Engine No. 104EB 2590 2213) - 5th owner. January 2014 (34,000 - 61,000 miles and counting....)
"Gretel" K100LT 1989 (Silver Grey) (VIN 0177324 Engine No. 104EA 2789 2211) - 4th+ owner. September 2015 (58,500miles and counting....). Cat C Insurance write-off rebuild Feb 17
"Donor" K100LT 1990 (Red)  (VIN 0178091 Engine No. 4489 2024) - 6th & final owner (crash write-off now donor bike).   June 2012 (73,000 miles) to November 2013 (89,500 miles)
    

24Back to top Go down   Short fork travel Empty Re: Short fork travel on Tue May 06, 2014 6:02 pm

Comberjohn

Comberjohn
Life time member
Life time member
Hi Paul. Sorry, should have updated the thread.
I replaced the oil with 330cc of Castrol Synthetic 10w and now the forks are fine. Just bought it in the local Halfords.
Wouldn't have believed 30cc would have made such a difference.


__________________________________________________
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
    

25Back to top Go down   Short fork travel Empty Re: Short fork travel on Tue May 06, 2014 6:18 pm

Born Again Eccentric

Born Again Eccentric
Life time member
Life time member
Hi Comberjohn,

Really appreciate the quick reply and your update. 

While I wait for the new oil to arrive (it was easier to get it from Amazon rather than my local Halfords - slightly cheaper and free postage too), I'll see if I can drain off some of the existing oil to reduce the volume by about 30ml. If that has the same effect as you have noticed, then I probably won't bother to change the current 10W oil yet.

Thanks for your help

Post "post" edit.... just successfully removed 30ml of oil from each fork - carefully removing fork drain plug at bottom of forks and used syringe to draw off the desired quantity of oil (had a handy unused 10ml syringe with a printer ink refill kit). Minimal mess too. I'll see what difference that makes on the ride to work tomorrow (kept the drawn off oil, just in case I need to squirt a bit back in again!)



Last edited by PaulLipscomb on Tue May 06, 2014 6:57 pm; edited 1 time in total (Reason for editing : addition of post edit)


__________________________________________________
Short fork travel Uk-log10 Short fork travel Sco-lo15Short fork travel Eu-log10
                              Paul  Short fork travel 905546712

"Heidi" K100LT 1991 (Grey) (VIN 0190172 Engine No. 104EB 2590 2213) - 5th owner. January 2014 (34,000 - 61,000 miles and counting....)
"Gretel" K100LT 1989 (Silver Grey) (VIN 0177324 Engine No. 104EA 2789 2211) - 4th+ owner. September 2015 (58,500miles and counting....). Cat C Insurance write-off rebuild Feb 17
"Donor" K100LT 1990 (Red)  (VIN 0178091 Engine No. 4489 2024) - 6th & final owner (crash write-off now donor bike).   June 2012 (73,000 miles) to November 2013 (89,500 miles)
    

26Back to top Go down   Short fork travel Empty Re: Short fork travel on Tue May 06, 2014 9:12 pm

Kyle10

Kyle10
Life time member
Life time member
Not to hijack a thread, but...

Anyone have experience/an opinion on these? Luftmeister anti dive kit


__________________________________________________
1985 K100rt 0052183
1983 Honda VF750 007713 
    

27Back to top Go down   Short fork travel Empty Re: Short fork travel on Tue May 06, 2014 9:48 pm

RicK G

RicK G
admin
admin
I haven't seen or heard anything about the Luftmeister anti dive but if they are the type that virtually locks the forks so there is no dive I would not recommend it to anybody.
The first time I came across that type was with the ST1100 Honda and it was absolutely woeful because while the brake was applied you had almost no front suspension.
I gather that over the years they have been reined and many of the manufacturers have abandoned them.
Luftmeister usually make good equipment so I wouldn't imagine they would be junk.


__________________________________________________
"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
    

28Back to top Go down   Short fork travel Empty Re: Short fork travel on Tue May 06, 2014 10:20 pm

duck

duck
Life time member
Life time member
Works Performance out of CA makes dual rate spring kits that get good reviews from K bike owners as well as owners of other brands.

http://www.worksperformance.com/


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

29Back to top Go down   Short fork travel Empty 1985 K100RS fork springs on Thu Feb 04, 2016 3:50 pm

brickrider2

brickrider2
Life time member
Life time member
I recently bought a set of Wilber's fork springs for my 1985 K100RS.  At 42 K miles I don't expect the installed springs are so tired, but the Wilbers were available at a good price and I bought them.  It's time to replace the fork oil, so I may install the Wilbers springs as well.  I've never been in these forks, so I consulted a part fiche and it appears the OEM springs should be single rate.  The Wilbers have tighter coils on one end, which I take to mean they are progressive wound.  
Should they be installed with the tighter coils in the bottom or the top of the forks?  Does it really matter?

    

30Back to top Go down   Short fork travel Empty Re: Short fork travel on Thu Feb 04, 2016 4:15 pm

Snod Blatter

Snod Blatter
Life time member
Life time member
Traditionally (in Japan at least) the tighter wound end goes at the bottom, but I can't imagine it matters as long as they're both the same.


__________________________________________________
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/
    

31Back to top Go down   Short fork travel Empty Re: Short fork travel on Thu Feb 04, 2016 5:19 pm

duck

duck
Life time member
Life time member
If you put the tight end down it will slightly increase the fork oil level since there's a larger volume of spring at the bottom.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

32Back to top Go down   Short fork travel Empty Re: Short fork travel on Thu Feb 04, 2016 7:17 pm

Inge K.

Inge K.
VIP
VIP
Progressive springs is usually mounted with the tight coils up to reduce unsprung weight.


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

33Back to top Go down   Short fork travel Empty Re: Short fork travel on Thu Feb 04, 2016 11:31 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
It's important to remember, if the bike is in the southern or the northern hemisphere the eon flux of the borealis either neutralises the oil increase or decreases the unsprung weight.
:suspect:


__________________________________________________

“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.

    

34Back to top Go down   Short fork travel Empty Re: Short fork travel on Thu Feb 04, 2016 11:39 pm

brickrider2

brickrider2
Life time member
Life time member
Point well taken  Very Happy  Time to move on to matters of substantial import, to wit, wrapping my brain around the advice given in post #11 for removing the caps/springs... Shocked

    

35Back to top Go down   Short fork travel Empty Re: Short fork travel on Fri Feb 05, 2016 12:15 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
@Kyle10 wrote:Not to hijack a thread, but...
Anyone have experience/an opinion on these? Luftmeister anti dive kit
We used to (think we needed to) use those in our Airheads back in the '80s. They're simply a short coil spring and a bit of thicker fork oil. In the '70s-era fork legs all they did was limit the suspension travel causing the springs to smash the daylights out of the rubberised bushing at the bottom of the fork, leaving bits of atomised rubber to clog up the rudimentary damper rods. Walk away.


__________________________________________________

“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.

    

36Back to top Go down   Short fork travel Empty Re: Short fork travel on Fri Feb 05, 2016 12:45 am

RicK G

RicK G
admin
admin
@Two Wheels Better wrote:It's important to remember, if the bike is in the southern or the northern hemisphere the eon flux of the borealis either neutralises the oil increase or decreases the unsprung weight.
:suspect:
It's the Australis in the Southern Hemisphere so if you use the Eon flux oil then it will go highly negative so you need to use the A-Eon flux of the Australis which will keep it neutralized until you cross the Equator when the swirl will be in the opposite direction and it will go crazy with positiveness and the front will almost float causing understeer.


__________________________________________________
"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
    

37Back to top Go down   Short fork travel Empty Re: Short fork travel on Fri Feb 05, 2016 12:50 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Fork spring epiphany: place one spring tight wind up and the other tight wind down. This balances the universe.


__________________________________________________

“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.

    

38Back to top Go down   Short fork travel Empty Re: Short fork travel on Fri Feb 05, 2016 4:49 am

K75cster

K75cster
Life time member
Life time member
@brickrider2 wrote:Point well taken  Very Happy  Time to move on to matters of substantial import, to wit, wrapping my brain around the advice given in post #11 for removing the caps/springs... Shocked

I'd do it by using post ten.


__________________________________________________
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.
    

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