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1Back to top Go down   Fork Seals And Oil Questions Empty Fork Seals And Oil Questions on Wed May 06, 2015 10:32 am

Grizzly

Grizzly
Silver member
Silver member
I appreciate that this has probably been asked and answered on here but I haven't really got the time to search for the info needed and don't know the best place to start looking, so since everyone on here is so nice, friendly and knowledgeable I thought I would just start a new thread and ask.

I need to replace my fork seals as they are leaking and rather badly now (should have done it when I first noticed it really!) and I have got the new seals today but the person at the shop I got them from didn't know which oil and how much I would need for them. So my first question is this, what weight of oil do I need for a K100 and how much is needed for each fork please?

Second question. Does anybody have any tips as to the best and easiest way to do the job?


__________________________________________________
Motorbike - Silver 1986 BMW K100 0008599 - 'Kylie' - written off

New Motorbike - 1998 Honda ST1100 Pan European ex-police and still without a name yet!
    

2Back to top Go down   Fork Seals And Oil Questions Empty Re: Fork Seals And Oil Questions on Wed May 06, 2015 11:48 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
The best way to go about sourcing info from the forum is to simply type a general phrase or two about your subject into the forum search window.

I typed 'fork oil level' and got this:

https://www.k100-forum.com/t840-changing-the-fork-oil

this

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

and this

https://www.k100-forum.com/t7962-k100lt-fichtel-sachs-fork-oils-seal-replacement

plus many others.

Having said that, I prefer lighter weight fork oil such as 5W or 7.5W because it allows the fork to react quickly to subtle bumps in the road surface, especially with my bike's retro, harder shorter sprung K75S 'sport' forks. Get a bloody great big drain pan, lay out the tools req'd, have a read of the various threads, block the front of the engine, remove the calipers, front wheel, slide the forks tube down and out, etc., and be very careful on the drain screws when tightening them back up as they strip if you so much as linger on a look at the sweet arse of the passing loverly out on the street, and have a measuring device in CC. Good luck, it's an easy and enjoyable, often overlooked, task.


__________________________________________________

“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.

    

3Back to top Go down   Fork Seals And Oil Questions Empty Re: Fork Seals And Oil Questions on Wed May 06, 2015 11:59 am

Grizzly

Grizzly
Silver member
Silver member
Thanks for that.

Just picked up some 7.5 oil on the way back from collecting kids from school/college so will likely have a good read of those links tonight and tackle it tomorrow as the weather is meant to be slightly better!

Fork Seals And Oil Questions 652573


__________________________________________________
Motorbike - Silver 1986 BMW K100 0008599 - 'Kylie' - written off

New Motorbike - 1998 Honda ST1100 Pan European ex-police and still without a name yet!
    

4Back to top Go down   Fork Seals And Oil Questions Empty Re: Fork Seals And Oil Questions on Wed May 06, 2015 3:11 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
One caution.  There seems to be a bewildering plethora of forks for these bikes, and they all use different amounts of oil.  Then there is one amount for oil change, and another for a complete rebuild, and some bikes use different amounts in each leg.

Make very sure you have the right amounts.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

5Back to top Go down   Fork Seals And Oil Questions Empty Re: Fork Seals And Oil Questions on Wed May 06, 2015 4:06 pm

sidecar paul

sidecar paul
Life time member
Life time member
Grizzly,
I found the easiest way of filling the forks is to use an old washing up liquid bottle.

 Clean out the old wu liquid and fill with 360cc (or whatever volume your bike requires) of water, using the nice clean kitchen measuring jug. Then mark the level with a permanent marker. Dry out the bottle.

Now you can retire to the garage and add a piece of plastic tube to the nozzle, making sure that it's a tight fit.

All that's needed then, is to fill with oil to the level marker, re-fit the cap and tube and squirt the oil down into the fork leg. Much less mess than trying to use a funnel and cheaper than buying a syringe.

Fork Seals And Oil Questions Sam_0711

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!
    

6Back to top Go down   Fork Seals And Oil Questions Empty Re: Fork Seals And Oil Questions on Wed May 06, 2015 7:42 pm

Grizzly

Grizzly
Silver member
Silver member
Nice idea.

Cheers Paul.

From what I have found, my bike should be 330cc. Does that sound correct for a bog standard K100?

Edited as I just realised it's 330cc and not 325cc as I typed first.

Embarassed


__________________________________________________
Motorbike - Silver 1986 BMW K100 0008599 - 'Kylie' - written off

New Motorbike - 1998 Honda ST1100 Pan European ex-police and still without a name yet!
    

7Back to top Go down   Fork Seals And Oil Questions Empty Re: Fork Seals And Oil Questions on Wed May 06, 2015 8:08 pm

blaKey

avatar
Life time member
Life time member
Good tip Paul!


__________________________________________________
Neil
K100RS 1986 RED!

Dress for the ride and the potential slide.
    

8Back to top Go down   Fork Seals And Oil Questions Empty Re: Fork Seals And Oil Questions on Thu May 07, 2015 4:43 pm

sidecar paul

sidecar paul
Life time member
Life time member
Yes Grizzly, 330cc for a std K100 and 360cc for a RS, RT, LT. The tolerance being -10cc....according to my 1988 BMW K series repair manual.
I never knew that a standard K100 required less fork oil than the faired models: you learn something new every day here.  Fork Seals And Oil Questions 78846

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!
    

9Back to top Go down   Fork Seals And Oil Questions Empty Re: Fork Seals And Oil Questions on Fri May 08, 2015 10:07 am

Grizzly

Grizzly
Silver member
Silver member
I suppose it's down to the lower weight of the bike?

May start another thread but wondering how feasible (if possible at all) it would be to fit a fairing onto my bike? Like the look of the fairing on the LT models and it would also give me more surface at the front for marking my bike up for doing marshalling duties on it.

Question


__________________________________________________
Motorbike - Silver 1986 BMW K100 0008599 - 'Kylie' - written off

New Motorbike - 1998 Honda ST1100 Pan European ex-police and still without a name yet!
    

10Back to top Go down   Fork Seals And Oil Questions Empty Re: Fork Seals And Oil Questions on Sat Jun 06, 2015 6:42 am

Grizzly

Grizzly
Silver member
Silver member
At last yesterday I got around to sorting my forks out.

Must admit it has made one hell of a difference. Hadn't realised they had got so bad!

Shocked

Thanks for all the advice on how to do it. I used the suggested squeezy bottle and it worked a treat. Only problem I had at first was how to measure out 330ml as I found the measuring jug had a great big crack in it. Solution - pop to the shop and buy a can of cola and empty that into the bottle, let the bubbles settle and mark the level.

Wink

Everything cam apart nice and easy too which was good and the whole job start to finish took me only a couple of hours.


__________________________________________________
Motorbike - Silver 1986 BMW K100 0008599 - 'Kylie' - written off

New Motorbike - 1998 Honda ST1100 Pan European ex-police and still without a name yet!
    

11Back to top Go down   Fork Seals And Oil Questions Empty Re: Fork Seals And Oil Questions on Mon Jun 08, 2015 4:49 pm

sidecar paul

sidecar paul
Life time member
Life time member
cheers cheers


__________________________________________________
'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!
    

12Back to top Go down   Fork Seals And Oil Questions Empty Re: Fork Seals And Oil Questions on Mon Jun 08, 2015 9:52 pm

indian036

indian036
Life time member
Life time member
@Grizzly wrote:Thanks for all the advice on how to do it. I used the suggested squeezy bottle and it worked a treat. Only problem I had at first was how to measure out 330ml as I found the measuring jug had a great big crack in it. Solution - pop to the shop and buy a can of cola and empty that into the bottle, let the bubbles settle and mark the level.

Wink
330mL (33cL at my daughter's place in France). No good here in Oz - most cans are 375mL.
Crying or Very sad

Bill


__________________________________________________
1985 K100RT  VIN 0028991  My original Very Happy   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Newest toy, slightly non-original
    

13Back to top Go down   Fork Seals And Oil Questions Empty Re: Fork Seals And Oil Questions on Fri Jun 12, 2015 7:56 pm

Grizzly

Grizzly
Silver member
Silver member
The cans that count in my opinion are either 440ml or 568ml over here!

Wink


__________________________________________________
Motorbike - Silver 1986 BMW K100 0008599 - 'Kylie' - written off

New Motorbike - 1998 Honda ST1100 Pan European ex-police and still without a name yet!
    

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