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Old 01-10-2007, 01:45 PM   #1
Rapid Dog OP
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R100gs Fork Oil/maintenance ???

Going to refresh my fork oil.
Couple of questions. The manual sez to :

Question #1

"...bleed shock absorbers by compressing and releasing 5-10 times until full damping is felt...."

Does this mean to just bounce the front end after it's all buttoned up?

Question #2

From one of the links I found it sez R100GSPD uses
410cc on the Left leg and 440cc on the right.

Is this correct?

Question #3
I haven't been able to find any 7.5w oil locally, only 5,7,or, 10.
Who makes it? I see that Belray makes a 7.5w, but I thoght there may be a special sooperGSguy oil...

your opinions are golden brothers

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Old 01-10-2007, 01:46 PM   #2
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cc's

ceecee's

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Old 01-10-2007, 01:53 PM   #3
jtwind
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I do know that the r100g s takes different levels in each fork leg. Someone can confirm if those are the correct volumes. When I can't find 7.5 weight I buy 5 and 10 and mix them in equal amounts. JT
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Old 01-10-2007, 02:07 PM   #4
SOLO LOBO
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I'm running 15 wt, and am a svelt 175lbs.... 7.5 wt sucked IMHO...


Then I got some Racer Tech "gold valves"
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Old 01-10-2007, 02:11 PM   #5
Joerg
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Question #1 - Yes.

Question #2 - Yes. The reason ist that both fork parts have different functions (compression damping is entirely controlled by the left fork, while rebound damping is controlled by the right fork), and if you do a "standard" oil change not all of it comes out.

Question #3 - As JT said, mix it. The fork oil recommended by BMW, for the GS fork in its original state, is "Esso Komfort", which is SAE 10W. You can also use different viscosities in the two compartments; recommendations are generally SAE 7.5 (or 7.5W-15) for the left and SAE 10 (or 10W-20) for the right fork.
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Old 01-10-2007, 02:59 PM   #6
datchew
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I"m glad you asked this question R-Dog.

Cause i'm planning this soon as well. If you replace your fork gaters, don't pay 40-something bucks apiece. Go here:

http://www.advrider.com/forums/showp...8&postcount=22

Or go neoprene like the dirt bike people.

BMW dealers will carry the 7.5 weight, but a thread I read long ago (and made notes from) but don't have marked said the best combination is as follows:

L/H fork 410cc 20W
R/H fork 440cc 15W


Local squid bike shops carry multiple weight fork oils for me but 3/3 bmw dealers i called only carry 7.5w bmw brand fork oil.

Jorge had something on his website about doing this as I recall. he used a ratchet strap or something to compress the forks all the way.


Please do post if you encounter anything mysterious cause I'll need to know. Also, please tell if you end up needing some special tool like this fork drain tool in the upper left of this page:
http://www.culayer.com/Joes_tools.htm

Cause i have access to a welder and will just make one.

Thx.
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Old 01-10-2007, 03:18 PM   #7
Renegade6
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I just replaced seals, oil and installed a race tech cartridge in mine a short time ago. In addition, if you are anywhere above 200 pounds go with more than 7.5 weight. For the fork caps, I just used a socket that I ground the chamfered edge off of on the top.
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Old 01-10-2007, 03:30 PM   #8
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I forgot to add that when I did mine the compression and rebound sides were backwards. Also, make sure you take good notes if you take them completely apart...
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Old 01-10-2007, 03:46 PM   #9
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all good

I'll just be changing fluids to start.

back in the day, we use to sit ato[ the tank to compress the forks while filling them...I assume this isn't nceessary.

Guess I'll just go 10wt on both sides from consensus since I'm 170 bars-ass-nekkid...
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Old 01-11-2007, 06:06 AM   #10
datchew
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Quote:
Originally Posted by Rapid Dog
I'll just be changing fluids to start.

back in the day, we use to sit ato[ the tank to compress the forks while filling them...I assume this isn't nceessary.

Guess I'll just go 10wt on both sides from consensus since I'm 170 bars-ass-nekkid...
I'm bout 175 after a big sandwich so lemme know how it feels. Haven't bought the fork oil yet.
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Old 01-11-2007, 07:33 AM   #11
bmwblake
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what are the lightweights running for oil? this is on my list to do shortly.

i'm about 150 geared up and soaking wet.
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Old 01-11-2007, 07:14 PM   #12
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this is still about fork oil, right?

Just have to chime in. I used 10-wt, and it's fine for me.

Of course, I'm about 380 lbs with my wife on my shoulders, my dog in my arms, the dog needs to pee and so do I, the wind is blowing from the southwest, and the scale reads 2 lbs when nothing's on it.
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Old 01-26-2007, 01:22 PM   #13
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fork gaters

...anyone know the fork gaters size? I think I'll go neoprene if I can find some at Cycle Gear or wherever...
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Old 02-25-2007, 11:20 AM   #14
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Question dive

So, I did the 7.5 mix in both sides...don't know what it had before.
It seems to have more dive on braking now.
Maybe I should bump up the viscosity on the compression side (left)?...or both sides?
Your thoughts...
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Old 02-25-2007, 12:04 PM   #15
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Quote:
Originally Posted by Rapid Dog
So, I did the 7.5 mix in both sides...don't know what it had before.
It seems to have more dive on braking now.
Maybe I should bump up the viscosity on the compression side (left)?...or both sides?
Your thoughts...
I use 15wt on the compression side and 10wt on the rebound. It works OK for me.
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