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Old 08-01-2005, 09:35 AM   #16
jtwind
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There are usually a number of things that add up to this problem. One of the few that does it by itself is a handlebar mounted fairing or windshield and Avon Gripsters. Otherwise it's usually a combination of problemsI'd let a few pounds out of the front tire if I were you. I never see recommended pressures the same. the front is always 2-3 lbs. less. Otherwise I guess the gripsters are the problem, I've had two buddies with r100gs's and both had weaving problems with gripsters. JT
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Old 08-01-2005, 11:39 AM   #17
SOLO LOBO OP
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Funny thing is I ride with a couple of fellow R100GS riders w/ Gripsters and none of them experience this problem when riding...



Quote:
Originally Posted by jtwind
There are usually a number of things that add up to this problem. One of the few that does it by itself is a handlebar mounted fairing or windshield and Avon Gripsters. Otherwise it's usually a combination of problemsI'd let a few pounds out of the front tire if I were you. I never see recommended pressures the same. the front is always 2-3 lbs. less. Otherwise I guess the gripsters are the problem, I've had two buddies with r100gs's and both had weaving problems with gripsters. JT
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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Old 08-01-2005, 12:29 PM   #18
Charles Hehl
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I have recent started to get the same weaving problem on my 1988 R100GS. It started when I changed from T-66's to Tourances. I can live with it now that I know it is there, but when it first happens it is a bit unnerving.
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Old 08-01-2005, 07:37 PM   #19
crarchitect
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flat spot at 12 o'clock

Hey inmates, first time poster, long time lurker.

My Jessie'd up stock windscreen wearing Fox shock'ed GS never weaves if I keep it above 100mph? What's your problem?

But now for the question: is it my imagination, or has my steering developed a "flat spot" at 12 o'clock, straight ahead. Sometimes I feel like I have to break a spot of resistance turning through dead center. Are they shot?
Can this be adjusted away?
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Old 08-02-2005, 05:42 AM   #20
jtwind
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Here is some things to check off the Airheads forum archive. JT

I am sending this in response to your posts concerning the wobble
problem on your 88 R100GS.

There are many areas to look at on your bike, and the trouble may be
caused by several working in concert to induce instability. Whenever i run
into a problem of this subtle nature, i look to the basics first, and do some
experiments to try to exascerbate or ameliorate the symptom by making
adjustments at each end of any available adjustment range. I'm talking more
about a diagnostic technique than a specific adjustment here, though,

In more specific terms, i would look to the following: (in each case i
mean to check that the item is not worn and is adjusted within BMW
specification and torque or setting)

1) Tire pressure and balance

2) rear wheel play at rear drive (check when the rear drive is hot, rocking
the wheel at the top and bottom, as if checking a wheel bearing)

3)paralever bearings (i know you changed them, just re-ckeck the torque
setting on the adjustable pin. )

4) swingarm bearings-condition and centering as well as preload and torque on
the locknut.

5) engine mount bolt torque (55 ft-lb here, the factory spec is too low,
IMHO)

6) rear shock spring sag and compression and rebound settings (refer to the
shock manufacturer's book for making the adjustments, or try moving each
setting to the extreme end of its' range and test riding to feel what the
effect of that change is. This can be very enlightening to discover what
setting causes what symptom.

7) fork spring condition and suitability for the loads you run.

8) Steering head bearing setting is critical, but it sounds like you've
addressed this. As the bearings are 14 years old now, it's time to remove,
wash and inspect them thoroughly, then repack and readjust them. hardened
grease can trigger the weave you're getting.

9) check that the handlebars are centered. Don't ask.

10) Take off the windshield. If it wasn't a pain to retype the list, I'd make
this first on the list. Fork-mounted windscreens and high speeds don't mix.
In avbsolute seriousness i would suggest that you never exceed 60 MPH with a
fork-mounted windscreen fitted that's higher than your elbows and wider than
your torso.

This list should land you on the problem. Don't forget that eveery
adjustment must be correct for the whole to work correctly. The GS is a
twitchy ride in the best of scenarios, which can make it very fun to ride,
but it is also very sensitive to little errors.

FWIW concerning tires, i rode a 91 GS/PD today that had new Avon
Gripsters. I only went about 5 miles, but i really flogged it through the
twisties in my development in the way back into the shop, and I was very
impressed with the grip, stability and lack of the roughness/noisiness that's
evident in most tire fitments on the GS models.
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Old 08-02-2005, 04:50 PM   #21
Frank Warner
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Quote:
Originally Posted by crarchitect
But now for the question: is it my imagination, or has my steering developed a "flat spot" at 12 o'clock, straight ahead. Sometimes I feel like I have to break a spot of resistance turning through dead center. Are they shot?
Yes they are shot. No imagination required. You will notice this worst at slow speed straight ahead type going. Bike will want to stay on one line, getting off that line to one half a degree off is very difficult.
Quote:
Originally Posted by crarchitect
Can this be adjusted away?
No.

I like easy questions.
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Old 09-17-2005, 06:10 AM   #22
datchew
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joining the fight against bike wobble

well, i just dug up this thread.
i'm having wobble as well.
was having no problems whatsoever until i replaced my rear tire.
old tire was metzler tourance and was worn very very flat. dangerously so when i got the bike. new tire is metzler tourance also.

wobbles only 70+mph and is really annoying.

below are some pics. I don't know what kind of rear shock i have, but was told when i got the bike that it's been rebuilt in the last couple years.

i'm gonna start off checking out air pressures and inspecting a couple things and trying to see what happenes if i remove the jesse bags.









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Old 09-17-2005, 09:33 AM   #23
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My wobble is 90% better since adjusting the bearings.....
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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Old 09-20-2005, 11:49 AM   #24
sdpc2
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wobble

I have a '95 gspd with gripsters, HT bags, Fox twin clicker and the upgraded front end. Recently i had the same wobbling issue... adjusting the steering head bearings fixed it right up.

s
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Old 09-20-2005, 02:10 PM   #25
Stagehand
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Quote:
Originally Posted by sdpc2
I have a '95 gspd with gripsters, HT bags, Fox twin clicker and the upgraded front end. Recently i had the same wobbling issue... adjusting the steering head bearings fixed it right up.

s
What upgraded front end? Fox twin clicker is a rear shock?


for what its worth, I just put gripsters on, and 5k miles later, they look like new. I was hoping to burn them out and get knobs back on, but these things wont die. Oh, and no wobble. Yet.

Also-- datchew-- what sort of rear topcase is that on that cool lookin GS?
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Old 09-20-2005, 02:25 PM   #26
SOLO LOBO OP
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yeah.. my gripsters are at 5K and look new as well


The topcase looks like a jesse "tool box" with a givi top plate on it. I have a jesse toolbox on my R100Gs and love it.

http://www.jesseluggage.com/rearcomp.html


Quote:
Originally Posted by Stagehand
What upgraded front end? Fox twin clicker is a rear shock?


for what its worth, I just put gripsters on, and 5k miles later, they look like new. I was hoping to burn them out and get knobs back on, but these things wont die. Oh, and no wobble. Yet.

Also-- datchew-- what sort of rear topcase is that on that cool lookin GS?
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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Old 09-20-2005, 07:16 PM   #27
datchew
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yup, solo lobo nailed it. It's what he said, but the givi case is long dead.

Can anyone by chance tell me what kinda shock that is that i have by inspecting the pictures?

I got the bike bout a month ago and am still trying to figure everything out.
The front fork springs and all that mess were replaced, but the head bearing is still the original. It was re-lubed about 5k ago, so i'm thinking perhaps soon is a good time to just replace the whole mess regarding that particular job. From reading up on it, it looks like a pain.

other options include touratech riser spacer thing to raise the handlebars, heated grips, and now, a new rear tire!

Anyway, i'm changing all the fluids, including fork oil and read something in my clymer book about lubing the splines on the back of the tranny??????
It's a dry shaft and was replaced about 5k ago, so i'm good to go there.

Anything else I need to be aware of or take care of soon?
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Old 09-21-2005, 06:19 AM   #28
sdpc2
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Front end

Hey Stagehand,

My bike has the gold tech emulators (i think that is what they are called) in the front, and the twin clicker in the rear. So far, it has been a good match.


Quote:
Originally Posted by Stagehand
What upgraded front end? Fox twin clicker is a rear shock?


for what its worth, I just put gripsters on, and 5k miles later, they look like new. I was hoping to burn them out and get knobs back on, but these things wont die. Oh, and no wobble. Yet.

Also-- datchew-- what sort of rear topcase is that on that cool lookin GS?
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Old 09-26-2005, 01:34 AM   #29
GuinnesS
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I owned a used 92 gspd for a while and when I first rode this particular bike It too had an unsettling weave, mostly at freeway speeds. In this case though it turned out previous owner had reinstalled the rear shock with the wrong arrangement of washers. This had the shock off axis and every little bump would induce a weave. $0.02
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Old 09-26-2005, 08:17 AM   #30
SOLO LOBO OP
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Works Performance! same as me...

Quote:
Originally Posted by datchew
Can anyone by chance tell me what kinda shock that is that i have by inspecting the pictures? ?
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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