Wind/Speed Wobbles
#1
07-28-2012 | 12:19 AM
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Joined: Jul 2012
Posts: 69
From: New Mexico
Wind/Speed Wobbles
I'm using my KLX as a daily commuter and I'm doing a decent amount of the highway riding but after about 65 miles I'm getting a decent amount of speed wobbles.
I have the proper tire pressure that it calls for on the bike, but any suggestions? Is this fixable, or am I getting to just tough it out?
Any information would be helpful!
I have the proper tire pressure that it calls for on the bike, but any suggestions? Is this fixable, or am I getting to just tough it out?
Any information would be helpful!
#4
07-28-2012 | 02:45 AM
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Joined: Jul 2010
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From: Northern Utah
Don't forget steering head bearing adjustment.
Otherwise: Balance of tires, condition of tire carcass/tread, trueness of rims, proper sag (front and rear), alignment.
Road surfaces can stimulate a wobble in a bike with a tendency to wobble, but, if the steering head bearings are properly adjusted, the tires are balanced on trued rims, proper sag is set and alignment is good, the road surface won't cause a wobble on it's own.
You DON'T have to "live with it". It's fixable.
Otherwise: Balance of tires, condition of tire carcass/tread, trueness of rims, proper sag (front and rear), alignment.
Road surfaces can stimulate a wobble in a bike with a tendency to wobble, but, if the steering head bearings are properly adjusted, the tires are balanced on trued rims, proper sag is set and alignment is good, the road surface won't cause a wobble on it's own.
You DON'T have to "live with it". It's fixable.
#5
07-28-2012 | 03:14 AM
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From: Abilene, TX
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I don't know, B58, some of this is a little inherent on bikes with headlight fairings, handguards, relatively light weight, and a taller center-of-gravity. Now, how much is too much and how much you can improve it does fall under the issues you brought up. I'd also say front tire tread pattern, new or used, can change things too. Even the big KLR650 can give a little of this feedback under the right conditions. But you're right that it's minimized by addressing the listed factors.
#6
07-28-2012 | 03:49 AM
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From: Northern Utah
To address the tendency to wobble at high speed: relax. Stiffening up only makes it worse.
PS: Actually, I thought the OP was just bragging that their bike would go as fast as 65 mph!
#7
07-28-2012 | 04:09 AM
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From: Northern Utah
Could you elaborate? I think mine is loose as heck, but i can't seem to feel any slop at all. In other words, I don't feel any play (i.e. like you might when checking an automobile ball joint or tie rod end), but the fork falls easily right or left if you just sit on it and lean it with your legs. Just seems wicked loose to me...
#9
07-28-2012 | 05:28 AM
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Joined: Aug 2011
Posts: 516
From: Phuket, Thailand
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After one week of hammering around the streets like a Moto hooligan, enjoying plenty of late hard braking with the new .52 springs. I noticed with the correct ride height again on my bike, the "KLX speed wobble of death" was very noticeable at high speeds....HHHmmm i thought...
Is it the ride height?? Well i had measured about 1/2inch (10mm) excess sag in suspension height & thought i would fit five 1.5inch diameter across stainless steel washers in the pre-load.
Five of these washers stacked measure about 1/2inch (10mm) & sorted out the ride height & got rid of the extra unnecessary sag....GREAT, my forks are now 100% perfect in ride/height/sag/not diving/comfort/racing etc etc BUT to my surprise that 1/2inch (10mm) has almost completely got rid of, the high speed "KLX speed wobble of death".......which makes me double happy!!!
Just goes to show if you f@ck around long enough with all the suspension settings, eventually you will stumble across the perfect stiffness & geometry!!
Is it the ride height?? Well i had measured about 1/2inch (10mm) excess sag in suspension height & thought i would fit five 1.5inch diameter across stainless steel washers in the pre-load.
Five of these washers stacked measure about 1/2inch (10mm) & sorted out the ride height & got rid of the extra unnecessary sag....GREAT, my forks are now 100% perfect in ride/height/sag/not diving/comfort/racing etc etc BUT to my surprise that 1/2inch (10mm) has almost completely got rid of, the high speed "KLX speed wobble of death".......which makes me double happy!!!
Just goes to show if you f@ck around long enough with all the suspension settings, eventually you will stumble across the perfect stiffness & geometry!!
Last edited by JoelThailand; 07-28-2012 at 05:33 AM.
#10
07-28-2012 | 12:31 PM
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Posts: 1,728
From: Cottonwood, AZ USA
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Are you running knobbies? If you have the original tires on, they will hunt, especially over pavement with uneven surfaces or those line indentations the DOT puts in the pavement for rain or something. My original tire would hunt a lot, and adjusting the air pressure would effect the results.