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Resonance... What a strange phenomenon on bikes.
When I had my Versys some years ago I installed a SW-Motech Crashbar and after that, at certain RPM the bike begin to vibrate... a lot... then I discover resonance in my bike at those RPMs. As I was getting mad because of that vibrations I changed it by another unit from Hepco & Becker and the problem disappeared. Apparently the different design did not cause such as troublesome vibrations.
I recently installed my SW-Motech topcase in my VStrom and now I can perceive the same strange phenomenon. A certain RPMs, the topcase starts to vibrate creating a very deep sound, as if the bike had an aftermarket exhaust (but not vibrations on the handlebar or other place) ... I hope it that sounds diminishes when I put some clothes inside...!
 

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You could also add some dampers to the mount. I cut out some silicone washers and added them around the mounting bolts between the mounting plate and my bike and it cut down topcase vibrations.
 

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resonance is a function of mass, so I filled my GIVI crashbars with metal BB's to solve the vibration problem.
Rashnak, do you remember how many BBs you had to use? I've made some efforts to reduce the vibrations with o-rings at the connection point, etc., but right at the sweet spot in RPMs, it's still pretty annoying.
 

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Rashnak, do you remember how many BBs you had to use? I've made some efforts to reduce the vibrations with o-rings at the connection point, etc., but right at the sweet spot in RPMs, it's still pretty annoying.
it's been 5 troublefree years...

but as I recall, the GIVI crash bars took about 6-8 ounces of BB's to fill.

Because I filled the bars from the bottom, I had to find a way to keep the BB's from falling out as I installed the bars back on the bike. So I used a little dab of that expanding foam they sell as home insulation to fill cracks. Once that hardened I installed the BB filled GIVI bars and have not heard any vibration since.
 

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BB/foam damper

it's been 5 troublefree years...

but as I recall, the GIVI crash bars took about 6-8 ounces of BB's to fill.

Because I filled the bars from the bottom, I had to find a way to keep the BB's from falling out as I installed the bars back on the bike. So I used a little dab of that expanding foam they sell as home insulation to fill cracks. Once that hardened I installed the BB filled GIVI bars and have not heard any vibration since.
That foam with BB's mixed in would tend to act as a damper, especially if it ends up out where the motion is greater. I think it would be worthwhile to try to enhance this effect, by stuffing foam and BB's together into the tubing.
 
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