BMW K bikes (Bricks)

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StandardK

StandardK
Silver member
Silver member
Hi Oz K’sters

Just wondering what the K crowd here are using brand wise for fork seals these days (it appears genuine BMW is the go?) and availability/pricing, also the 5w Vs. 10w fork oil question; what’s your experience on our roads?

Regards

Dan

Please move post if not appropriate!

    

Arlina

Arlina
Moderator
Moderator
I just bought me 2 sets of original BMW seals for 2 bikes, sure I got the right ones wich will last another 20 years.


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Oz K owners - Fork Seals & Oil, opinions?  Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project
    

MartinW

MartinW
Life time member
Life time member
When I replaced my seals 20+ years ago I packed heavy silicone grease between the dust covers and the seals. I change the grease every 1-2 years depending on conditions encountered. Seals can also benefit from the fitting of gaiters, and the occasional cleaning with a Seal Mate. I so far haven't fitted gaiters but if I were riding a lot of gravel roads I probably would.
Regards Martin.


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K75s Hybrid
    

Dai

Dai
Life time member
Life time member
So far a set of gaiters has protected my fork seals for around 75,000 miles. I got them from Motorworks, but don't ask me whether they were OEM or third-party, 'coz ten years on I'm buggered if I can remember!! Very Happy The gaiters lasted around 65-70,000 miles before splitting to the point where I decided to replace them.


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1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

Gaz

Gaz
Life time member
Life time member
G'day Dan, when I first cleaned up my K75 which has the factory optional 'S' forks, I used 5W oil and the factory spec volume of 280ml for those forks.

The result was that I felt the bike handled well and tracked true over all surfaces including some very poor sealed roads around Dungog in NSW however the front end was very harsh to my way of thinking. I am no suspension guru and do not have racetrack skills but after thinking about this for 20-30,000km I decided that maybe the harshness was caused by the fork rebound not being damped enough. I had never had the forks bottom out so felt the compression was OK.

I changed the fork oil to 7.5W and immediately felt an improvement. I've done another 20,000km at that and am soon to change the oil to 10W to see if that improves the ride even more.

Just my experience.

The standard K100 forks may behave a little differently to my forks as they have longer travel and take 330ml of oil.

Cheers


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Gaz
1990 K75 6427509; 1987 R80G/S PD 6292136; 2010 G650GS ZW13381; 95 K1100LT 0232224
    

6Back to top Go down   Oz K owners - Fork Seals & Oil, opinions?  Empty Forks on Mon Jan 06, 2020 7:41 am

daveyson

daveyson
Life time member
Life time member
I'd use original seals because it's a type of job you don't want to do twice. 

But I have to admit I just use automatic transmission fluid for oil, because I've got enough to last for ever.  It's good as far as I can tell,  but I don't go around corners trying to break records,  or anything like that.


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11/1985 bmw k100rt (late model)  Vin. 0090567
    

brickrider2

brickrider2
Life time member
Life time member
I'm aware of folks on another forum using SKF fork seals.  They are reported to have very low stickion (?) but are priced at a high premium.  Has anyone here fitted them to their K-bike?   Question


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1996 K1100LT
    

StandardK

StandardK
Silver member
Silver member
Thanks for the replies - I’ve got some genuine seals on the way (motobins - far cheaper then M&W BMW in Brisbane, looks like no OEM sold by Munich in WA)

I might give 10w a go I think.

    

duck

duck
Life time member
Life time member
FWIW: I've always had very good results using Honda SS-8 (10W) in all of my K bikes in the factory recommended amounts.

Oz K owners - Fork Seals & Oil, opinions?  X001


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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
    

yamaguzzi

yamaguzzi
Platinum member
Platinum member
I used 7 weight  in the recommended amount last year when I did my seals and also packed the dust cap with silicone grease . Big improvement in the feel of the front end when riding on rough road .


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1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

MartinW

MartinW
Life time member
Life time member
Over the years I've played around with oil amounts and weights but I'm now happy running stock.
Regards Martin.


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K75s Hybrid
    

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