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-   -   F800GS unstable at higher speeds (http://www.advrider.com/forums/showthread.php?t=849380)

Baiazid 12-17-2012 07:45 PM

F800GS unstable at higher speeds
 
Hi,

recently I had 30.000km service and I asked them to replace tires as well.
Service consisted also in changing fork oil.
I have now Haidenau K60.

I went for a trip next day after the service and noticed on highway when I go beyond 110kmph, bike starts to be very unstable. Front fork starts to shake semi-violent (left and right). If I slow to 105 .. all is fine.

Before this I used to go 160kmph with no drama.

What can be? :norton

Reaver 12-17-2012 07:53 PM

Did they balance the tires? If the aignment was off it would track funny but since it's speed related I'd say an out of balance front wheel. Bent rim?

Baiazid 12-17-2012 08:18 PM

Quote:

Originally Posted by Reaver (Post 20272900)
Did they balance the tires? If the aignment was off it would track funny but since it's speed related I'd say an out of balance front wheel. Bent rim?

Saturday I am going again into the service.

Rim has a small bend (had that for last 2 years) and never affected my stability at any speed.

Tires look balanced (they have extra weight added on one side) but I cannot tell if was done properly.

sorebutt 12-17-2012 09:05 PM

If it is a tire balance issue it should be an up down type vibration. I'm gguessing front wheel alignment. Loosen the pinch bolts that hold the axle on one side. Then bounce the front end up and down a number of times. Then tighten the pinch bolts and take it for a spin.

Gangplank 12-17-2012 11:32 PM

Could be a bad tire. Ive had a few sets of TKC 80's that got the death wobble over 80 mph.

Did they mount it right?

catweasel67 12-17-2012 11:34 PM

sounds lke a wheel balance issue to me - maybe a weight fell off?

Angryrican 12-18-2012 04:42 AM

It's most likely the tire, there are a few threads about K60's doing this when brand new and it goes away after a few hundred miles of break in

Loutre 12-18-2012 05:38 AM

Quote:

Originally Posted by Angryrican (Post 20274814)
It's most likely the tire, there are a few threads about K60's doing this when brand new and it goes away after a few hundred miles of break in

<-- What he sais. It'll go away after a couple hundred miles. Gives you another reason to get the bike out there and ride it... It's for safety reasons of course :wink:

JRWooden 12-18-2012 06:25 AM

Quote:

Originally Posted by Angryrican (Post 20274814)
It's most likely the tire, there are a few threads about K60's doing this when brand new and it goes away after a few hundred miles of break in

A:
Do you know how that works?
What's going on in the first few hundred miles?

ragtoplvr 12-18-2012 06:30 AM

check your tire pressure. Now. Unstable on a motorcycle is most commonly a low or over inflated tire. You can pick up a nail in the dealer parking lot. If pressure is right, then you can look for other stuff. If you are recommended to run 42 psi for tire life, try the recommended pressures in your manual.. The longer life might not be worth it.

Rod

Dr E 12-18-2012 06:41 AM

Have you checked your preload on your rear suspension? When that gets off, one of the signs will be front end wobble or instability.

Good luck!

runnin4melife 12-18-2012 08:59 AM

I don't take my TKCs above 80mph because it feels as if the bike is floating, put a set of road tires and I can go well over 120 with no problem. Same rims, same suspension just the tires. Some are worse than others, My first set of TKC80s, the front was really bad but I didn't have my new suspension then so I just rode it out and they went away (I pulled and checked balance, and whether the rim was bent or true, all was fine). I have never ran the K60s so don't know about them. I was looking at them for my Alaska trip so I hope they don't have an issue at 80+...

DoWorkSon 12-18-2012 11:23 AM

Just got k60's on my F8... They are fine at 80mph+... No issues, feel similar to stock street tires..... They have less than 50 miles on them too. Just a slight vibration at low speeds(15 mph), but not bad

Angryrican 12-18-2012 02:27 PM

Quote:

Originally Posted by JRWooden (Post 20275221)
A:
Do you know how that works?
What's going on in the first few hundred miles?

I don't, I'm going by the scientific evaluations of the members of this forum:rofl

joking aside it's mention quite a few times in this forum in different tire threads, I personally have never had the issue but I'm am super anal about tire pressure setting on and off road and dialing in suspension

JRWooden 12-18-2012 07:40 PM

Quote:

Originally Posted by itsatdm (Post 20277274)
I have posted this before without any feed back. A 15 min free mod, what do you have to lose?

Feedback: It worked for me, thanks Gary! :clap


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