Rack Vibrations driving me nutz! - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 13 Old 03-10-2007, 10:00 PM Thread Starter
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Angry Rack Vibrations driving me nutz!

I have the amotostuff adjustable top rack and it vibrates like a freakin sex toy during mid to high throttle, say around 4k and up. So of course the top box then vibrates just as bad. The sound is annoying and makes the bike sound like a piece of junk. I've taken the top box off and removed the top half of the rack and inspected everything. I can not figure out what the heck is vibrating!!! :evil:

Anyone else have this problem? I don't know if the rack is the problem or if I should be looking at something else.

-dennis
2006 DL650 Silver Blue
2004 Triumph Thruxton
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post #2 of 13 Old 03-11-2007, 10:53 AM
 
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HI Dennis< i can sympathize with you as my givi crash bars hit a high note at 5200-5900 RPM. It drove me nuts. I loctited them and its better although there is still a slight vibration. Try some tight bungees over the box and see if it makes a difference. If it doesnt help then you can start looking at the latches or something else altogether. good luck JonnyReb
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post #3 of 13 Old 03-11-2007, 11:06 AM Thread Starter
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Originally Posted by JONNYREB View Post
HI Dennis< i can sympathize with you as my givi crash bars hit a high note at 5200-5900 RPM. It drove me nuts. I loctited them and its better although there is still a slight vibration. Try some tight bungees over the box and see if it makes a difference. If it doesnt help then you can start looking at the latches or something else altogether. good luck JonnyReb
Thanks.
The thing is, even with the box off, i can hear the rack vibrating. So i'm trying to stop it at the source. Even if i make sure the givi doesn't vibrate, the rack itself is still making noise.

-dennis
2006 DL650 Silver Blue
2004 Triumph Thruxton
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post #4 of 13 Old 03-11-2007, 11:38 AM
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There are some captured lock nuts in the adjustable top plate that are for a different kind of top box (IE you don't need them). Remove the plate and put it on the bench, place a socket under the nut and drive it out with a punch. Re-install plate, no more vibration.
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post #5 of 13 Old 03-11-2007, 01:10 PM Thread Starter
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Originally Posted by Nomadmax View Post
There are some captured lock nuts in the adjustable top plate that are for a different kind of top box (IE you don't need them). Remove the plate and put it on the bench, place a socket under the nut and drive it out with a punch. Re-install plate, no more vibration.
Thanks, I'm gonna try this. I wondered if those things were the culprit.
I'll report back...

-dennis
2006 DL650 Silver Blue
2004 Triumph Thruxton
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post #6 of 13 Old 03-22-2007, 07:59 AM Thread Starter
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Well, so far no luck with those nuts. Those things are REALLY welded in there! They don't seem to move at all so I'm not so sure they are contributing to the vibration. But check this out... I had the box off, bike on centerstand, in neutral, I was standing on the right side of the bike goosing the throttle. I looked at the rack and every time i got the throttle to around 5k or so, the top plate on the rack actually BOWED! It flexed becoming higher in the middle! That's how much vibration there is back there. Is the rack the problem, or is the rack vibrating as an end result of something else that's vibrating? That's what I'm trying to figure out. And because of the brake light wiring from my Givi box, I can't remove the rack without removing the wiring which is a major PITA.
But if the rack is vibrating that bad, of course the Givi and all it's plastic reflectors and other panels are vibrating like mad, i'm sure. :mad:

-dennis
2006 DL650 Silver Blue
2004 Triumph Thruxton
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post #7 of 13 Old 03-22-2007, 06:00 PM
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Originally Posted by d2mini View Post
Well, so far no luck with those nuts. Those things are REALLY welded in there! They don't seem to move at all so I'm not so sure they are contributing to the vibration. But check this out... I had the box off, bike on centerstand, in neutral, I was standing on the right side of the bike goosing the throttle. I looked at the rack and every time i got the throttle to around 5k or so, the top plate on the rack actually BOWED! It flexed becoming higher in the middle! That's how much vibration there is back there. Is the rack the problem, or is the rack vibrating as an end result of something else that's vibrating? That's what I'm trying to figure out. And because of the brake light wiring from my Givi box, I can't remove the rack without removing the wiring which is a major PITA.
But if the rack is vibrating that bad, of course the Givi and all it's plastic reflectors and other panels are vibrating like mad, i'm sure. :mad:
I've seen the exactly same thing. I've found that keeping the attachment nuts tight cuts down on the buzz, but doesn't eliminate it. I gotta figure there's a resonating frequency thing going on here, so removing nuts/mass in the right place should move the moment of resonance, hopefully to around 12K RPM, which you'll never hit.

I can dream, can't I? It drives me nuts the most because the Amotostuff rack setup is so damn nice otherwise.

-RMRR
'05 DL1000 - Dead at 66K miles.
Nerding it up at Wheelnerds.com
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post #8 of 13 Old 03-22-2007, 06:04 PM
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Originally Posted by d2mini View Post
I have the amotostuff adjustable top rack and it vibrates like a freakin sex toy during mid to high throttle, say around 4k and up. So of course the top box then vibrates just as bad. The sound is annoying and makes the bike sound like a piece of junk. I've taken the top box off and removed the top half of the rack and inspected everything. I can not figure out what the heck is vibrating!!! :evil:

Anyone else have this problem? I don't know if the rack is the problem or if I should be looking at something else.
I found what was making the buzzing noise. There are four of these captured threaded inserts in the top plate that just buzz in their respective holes. There are no bolts in them so they are free to rattle around in the holes. I think that is wahat you are referring to. I also noticed that with my givi top box on thtop rack it bounced around enough to crack the aluminum. I have since removed the top piece entirely and attached the original Givi mounting rack to the lower plate. Buzzing is gone.
post #9 of 13 Old 03-22-2007, 06:38 PM
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with the givi rack sitting on the lower plate, does it still sit further back than just on the OEM tail rack?

'08 Yellow DL650
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'06 Red DL650 with some goodies
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post #10 of 13 Old 03-22-2007, 06:48 PM
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Trust me brother. If you want that vibration to stop do what I suggested above. Those captured lock nuts are the cause. Remove the top plate, place a socket (larger than the nut) under it and get a 6" 3/8 drive extension. Put the extension in the hole on top of the nut and hit that MF with a hammer like you mean it. Do that three more times and re-install.

OR

Get used to it.

Last edited by Nomadmax; 03-22-2007 at 06:50 PM.
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