These crashbars, are both inexpensive, and provide the most coverage for the $400 dollar side panels. but they do tend to vibrate some in the 4800-5300rpm range(ie a really sweet cruising range for the wee). I have not really been bothered by this much but I had a brain wave yesterday. And the beta version was tested today. I have found a soloution that will not eliminate the vibes but will reduce them to the level of no crash bars installed within 8-10%(this is from a displacement accelerometer on a vibescanner used to monitor industrial machinery)
here is a pic of the Beta version of the damper:
This came to me while cleaning a shotgun that had a mercury recoil suppressor fitted into the stock.
I did not want to pull the recoil pad on the shotgun(it is epoxied on) but I found a 3"long 3/4" pipe nipple in my junk drawer and some caps. I also have about 30 lbs of mercury left over from my shop (used for removing lead from gun bbls., and also in making Daguerreotypes) so I sealed a cap on one end filled the tube to within 1/4" of the top and sealed the second cap on. I now had the recoil supressor(uh damper) built and since I wanted to do a concept test I wrapped it in tape to build up the body dia larger than the caps. two worm clamps around the vibe damper after I padded the crash bar tube with masking tape.
I had measured the amplitude of the bar vibrations before the install, and after, and the motor mount vibrations, without the CBs installed.
the motor mount test spot yielded a displacement of right at.014"
the crash bar end showed a displacement of .112" without the damper.
the crash bar end showed a displacement of .006" with the damper on the damper mt side and a displacement of.011" on the opposite side. (these measurements were taken in fifth gear on the interstate on level ground with the throttle held with the rosta cruise at 4900, 5000,5100,5200, and 5300rpm the displacement numbers above are avgs. of each rpm point)
the seat of the feet and hands vibe scanner said holy shit this is just like no crash bars!!!
I installed the damper on one side only, hoping that it would cause the 2 sides to vibrate at non-sympathetic frequencies, thus producing destructive interferance transfered through the spreader bar from one side to the other to help reduce the vibrations even more. I will let you know in a few days if there is any benefit in running one on each side(the danger is that they may sync the vibes on both sides and produce sympathetic interference and make the vibes worse!) but a test is still in order.
Another nice thing about this rig is acts on all nodes of vibration (even though verticle is the primary node) It reduces the side to side shake as well.
OK I hear it now I don't have any Mercury laying around, go to Ebay and look for C&H or Break-o MERCURY TYPE shotgun recoil suppressors. and mount as per my pictures.
link to C&H: http://www.mercuryrecoil.com/#top
And by the way this works many many times better than filling the bars with bbs or lead shot (and winds up being lighter)
IMPORTANT, The more rigid your mt. is the better it will work, the commercial units should work even better than mine has, as they have a number of internal baffles, that give the mercury more surface area to push against. (I would look for the 7/8" dia 5 " long 16 oz model) my home brew has 10 oz of mercury in it. and is 4" long
I have tried just weights up to about 3 lbs, set about every where on the bars and the right amount in the right place works well but this works much better and is cake to install, it also dampens across the rpm range not just at a sweet sport like tuning with weights.
It really was like taking the bars off.
Now I am making no bs here this will not NOT make the strom bmw boxer smooth, but it will get you very close to the bikes feel without the crash bars, even when you have them on!