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Old 02-13-2013, 03:11 PM   #1
fcaeiro OP
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Gs1150 wobles from 140kmh up

Hi there I'm reading these forums about this at quite a While and still don't know what can do this ..
My 2001 GS1150 with 50k kms and ohlins set always used tkc ....
And I always have it rock solid up to 190kmh ( all the bike can do)...

On my last change of the front tkc I started to feel wobble, shaking left to right on the handlebar / front wheel when I go up of 140kmh and at 160 I have to slow down or else the shaking is so big I think I will loose control of the bike..

So I had been on tyre shop 3 times and wheels where calibrated both front and rear without improvement ..
I started to change shocks setting and not great or even any improvement at all...
So I take these opp and put my 9years old ohlins to rebuild as the front had a small leak...
Shocks rebuild and woww new bike (shocks are in fact a real differentiator) ...
But wobble shaking still the same start at 140km and at 160 bike is almost without control..
I checked the front and rear of the bike and everything is ok without any strange movements or plays... ( that. I can see)

So my next step is to change tyres...
But I'm really worried about this could be very dangerous
I will change tyres to tourance so that I'm sure if the these don't solve the problem and I have to go to BMW they don't start saying this normal with the tkc and the tkc is limited to 160 etc
Don't want excuses I use this setup for years and never had this...

Any constructive opinion comment are welcome ..

fcaeiro screwed with this post 02-13-2013 at 03:17 PM
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Old 02-13-2013, 08:14 PM   #2
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I would suspect worn bearings somewhere.
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Old 02-13-2013, 11:10 PM   #3
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they all do that
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Old 02-13-2013, 11:47 PM   #4
fcaeiro OP
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Sorry but I have this setup 10 years have ride others gs and never had this ..
One test I will do is taking out the BMW top case ..
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Old 02-14-2013, 12:30 AM   #5
bdarling
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Are you experiencing any unusual tire wear to indicate a problem? TKCs tend to wear down quickly, so lopsided wear should be apparent within 1000 miles.

Wobble could be a number of problems, but if you've checked the entire front end for play (wheel bearings, telelever bearing, steering head bearings, and triple clamp torque), the next most obvious culprit would be an out-of-true wheel. Truing these cross-spoked wheels is beyond the expertise of your average wheel shop. Even the BMW dealers are hit and miss (as I've heard). Woody's Wheel Works in Colorado is the shop you'll see recommended time and again here.

Hail Mary would severely worn paralever pivot bearings or final drive bearing.
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Old 02-14-2013, 06:27 AM   #6
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Have you checked if the new tyre is fitted in the right direction on the rim? There is a directional arrow on the tyre.
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Old 02-14-2013, 06:55 AM   #7
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I can't find that arrow on the tyre ...
And now the tyre is already worn as it is..
And 3 times on tyre shop would they miss that ... Maybe but can't find the arrow on the tire only in the rim
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Old 02-14-2013, 07:04 AM   #8
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Just had a look at the TKC on my GSA, there is definately an arrow. I'm no tyre expert, but these tyres that have a direction cannot be turned around. My arrow is on the left side only.
I have once experienced strange handling on a car and it turned out to be a tyre that was mounted the wrong way around.
Go and have another look. Those TKC's are directional.
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Old 02-14-2013, 07:20 AM   #9
JimVonBaden
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While it is generally preferrable to mount a tire the direction the arrow say, the TKC is often reversed by some to extend tire longevity.

I would check, as already stated, the tire pressure, the lower ball joint on the A-arm, and ensure that all the clamping bolts are tight.

Also, I assume this tire was balanced? High speed vibration, not generally a wobble, comes from poor balancing.

Lastly, don't forget the rear of the bike. A loose wheel or bad FD bearings can have an effect felt on the front.

Jim
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Old 02-14-2013, 07:26 AM   #10
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140 kph = 87 mph

Click the below sentence and it will take you to a Webbbike world article about the TKC 80s. My 03 GSA came with TKC80s and had a speed limit sticker near the speedo. My TKCs were smooth at all speeds. Maybe they just need some miles to settle in.


"Consequently, we both experienced a noticeable vibration in the handlebars at speeds over 80 mph (129 km/h), more in the GS than the V-Strom. But this turned out to be a natural speed limiting system, which was probably all for the better."

http://www.advrider.com/forums/showthread.php?t=809938
http://www.advrider.com/forums/showthread.php?t=492114
http://www.advrider.com/forums/showthread.php?t=176305
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Old 02-14-2013, 07:35 AM   #11
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set the front shock preload one click stiffer and see if it makes a difference.
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Old 02-14-2013, 10:07 AM   #12
fcaeiro OP
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Quote:
Originally Posted by JimVonBaden View Post
While it is generally preferrable to mount a tire the direction the arrow say, the TKC is often reversed by some to extend tire longevity.

I would check, as already stated, the tire pressure, the lower ball joint on the A-arm, and ensure that all the clamping bolts are tight.

Also, I assume this tire was balanced? High speed vibration, not generally a wobble, comes from poor balancing.

Lastly, don't forget the rear of the bike. A loose wheel or bad FD bearings can have an effect felt on the front.

Jim
Hi Jim good you mentioned the rear wheel,meanwhile this problem was happening for 2 times my rear wheel unscrew itself and I noticed at very low speed going out of my garage and the effect was a complete front wobble ....
Could this be my rear wheel ??
I can't find any play shaking the wheel..
I now have torqued it to 105nm hope never happen again...

My tire pressure is 2.5 front 2.7 rear. ... But with 2.2 2.5 it was the same..

"he lower ball joint on the A-arm, and ensure that all the clamping bolts are tight."

Can you put some pics maybe my English but I don't know whatt/where are these points to check ..
Both wheels where balanced 3 times

fcaeiro screwed with this post 02-14-2013 at 03:08 PM
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Old 02-16-2013, 04:53 AM   #13
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Quote:
Originally Posted by jsb223 View Post
set the front shock preload one click stiffer and see if it makes a difference.
This means increasing rebound damping, one click counter clock wise, right ?

I'm following these :
http://www.ohlins.eu/download/26/Ohl...-absorbers.pdf
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Old 02-16-2013, 01:37 PM   #14
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NO! spring preload and rebound damping are two different adjustments that provide two different functions.
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Old 02-16-2013, 01:41 PM   #15
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Quote:
Originally Posted by bdarling View Post
Are you experiencing any unusual tire wear to indicate a problem? TKCs tend to wear down quickly, so lopsided wear should be apparent within 1000 miles.

Wobble could be a number of problems, but if you've checked the entire front end for play (wheel bearings, telelever bearing, steering head bearings, and triple clamp torque), the next most obvious culprit would be an out-of-true wheel. Truing these cross-spoked wheels is beyond the expertise of your average wheel shop. Even the BMW dealers are hit and miss (as I've heard). Woody's Wheel Works in Colorado is the shop you'll see recommended time and again here.

Hail Mary would severely worn paralever pivot bearings or final drive bearing.
I'd reckon the culprit would be amongst these items to check.
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