Wobble @ 60 mph? - K-Bikes.com - Excellence in Motion
 
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post #1 of 7 (permalink) Old Apr 8th, 2007, 12:11 pm Thread Starter
 
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Wobble @ 60 mph?

Yesterday I noticed that when crusing at 60 mph and I take both hands of the handle bars, the front end starts to shake/wobble violently. Interestingly, it only does it at 60; any faster or slower it's solid as a rock. I am not sure if it's tire wear or balance or something else. I have never experienced this in 24,000 miles with this bike. Anyone with similar experiences? Lou
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post #2 of 7 (permalink) Old Apr 8th, 2007, 12:49 pm
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Wobble

The K12RS should run as if it was on rails. First guess would be the front tire, second a bad steering head bearing. Check for play with the bike on Center Stand and a buddy on the rear seat to make the front wheel come up.

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post #3 of 7 (permalink) Old Apr 8th, 2007, 7:04 pm
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front wheel.

Quote:
Originally Posted by Dr_Lou
Yesterday I noticed that when crusing at 60 mph and I take both hands of the handle bars, the front end starts to shake/wobble violently. Interestingly, it only does it at 60; any faster or slower it's solid as a rock. I am not sure if it's tire wear or balance or something else. I have never experienced this in 24,000 miles with this bike. Anyone with similar experiences? Lou
I have a similar issue...however I noticed mine well into triple digits.
I noticed it shortly after having new tires installed for a ride to Canda (from NY)
On a nice empty long strip of road, I opened it up a lil for the first time since buying the RS only a few weeks prior.
At approx 125mph, I started to feel a wobble, at 130, it got worse. Anything under 115 was perfectly fine. (I was fine with that number for the remainder of the trip.)
When I returned home, I called the dealer...I was somewhat apprehensive describing my problem of wobbles at 125mph...it didn't phase the service manager and he had it picked up and checked out.
The front rim has a tiny dent...they balanced it and to this day I have not had an opprortunity to get it back up to 125mph. They recommended leaving it alone or buying a new rim. I left it alone...for now.
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post #4 of 7 (permalink) Old Apr 9th, 2007, 4:52 am
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Quote:
Originally Posted by jurgen
The K12RS should run as if it was on rails. First guess would be the front tire, second a bad steering head bearing. Check for play with the bike on Center Stand and a buddy on the rear seat to make the front wheel come up.
Yes, that's what mine is like - runs on rails. The steering damper should also be checked, but these bikes should run pretty true without it. If you start to get the wobble at 60 then decelerate with light touch on the bars and if the wobble gets worse, heading for the 'tank slapper syndrome' there's a real problem to look at.

Most other bikes can do this and their steering dampers are essential for front stability. In the time I've ridden my KRS I've not been able to make this happen at 60, with or without the damper fitted so I believe it's a very stable bike. The only time I felt the damper was helpful was riding roads with a rough grooved surface and the front steering was more predictable. I'm a Luddite still on Bridgestone BT020s and a new front tire does feel sensitive as if on an ice skate for the first hundred miles, I think that's normal. Then it just goes solid until the next tire change.



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post #5 of 7 (permalink) Old Apr 9th, 2007, 7:26 am
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sometimes a front end wobble is caused by the rear wheel/tire.Tire wear and pressure are pretty touchy.Cracks in frame near steering head or swingarm will cause problems.
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post #6 of 7 (permalink) Old Apr 9th, 2007, 8:11 pm
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I had same problem at 20,000 did all the tire things and at 24,000 put on new front and rear shock, from Works.
That was the fix for my wobble.

Bazra
aka: The Flash
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post #7 of 7 (permalink) Old Apr 11th, 2007, 12:04 pm Thread Starter
 
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I replaced the tires and solved the problem (they had about 9K on them anyway). Thanks for the help. Lou
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