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Discussion Starter #1
Put the dirt rack crash bars on the bike, I like them, but at highway speed I'm having vibration in the handle bars and foot pegs. Any ideas to cut it down some? Would neoprene washers help or would they be crushed with the 18 foot pounds of torque?
 

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Is it all speeds and rims on the highway, or a narrow range. My bars vibrate something fierce in fourth gear, 3000-4000 rpm, but are fine in fifth gear at the same rpm!
 

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A thin piece of rubber at all contact points should cure all vibration issues. Go to home depot or lowes and go to the flooring section. Or better yet, cut up an old tire innertube.
 

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D C,
Try anything/try everything.
Some times none of it works. Some times the first thing was the Best thing!
 

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Mine too.
It's a home fabbed unit and very basic.
My problem centers on being hard mounted to the frame.
Been wanting to shave off a little to make clearance for
urethane washers. Seeing this thread, having the night off,
and just having some coffee made me decide to fart with it a
bit. If I come up with anything cool the wife can pic n' post
with her camera on here. I never bothered learning. lol
I'd rather spend my time learning how to make a great n'
cheap bike even better! (gigglesnort)
 

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Discussion Starter #8 (Edited)
I'm considering splitting a short section of radiator hose, drilling some holes through it and placing that around the down tube using it as a rubber isolator. Cheap if you come up with a fix let me know. I'm going to start experimenting!
 

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Same mentality here DC dude.
Thanks for the rad-hose idea. I wasn't thinking of going that
thick but surely can then at the most add a mount bracket or
two if it wiggles too much.

Got the laptop, tunes, and bike in the semi heated garage............
time to bust some knuckles.
 

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Discussion Starter #10
Well Cheap, have an update. The split radiator hose idea did not work. I have the stock crash plate on it. So a split hose wouldn't fit. I cut strips off the radiator hose and placed them between the crash bars and then bracket on the down tube. I had to get longer bolts 4-1/" ones for it to work. For the bolts that attach to the subframe I placed a small piece of rubber (spoke protector rubber off wire wheels) and put it between the crash bars and the sub frame. Depending on the weather tomorrow I'll see how the vibrations do.

Have you come up with anything?
 

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Not trying to insult anyone's intelligence; you've probably done this already; but . . . adjusted balancer chain tension recently?
 

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I've done my 'doo (EM) each riding season.

Didn't come up with anything better. Took off the bracing and footpegs
to drop some weight (vibrating mass) Just a solid curling bar straight across
now and adding soft handgrips for vibe absorbing hiway pegs. The solid bar
shakes much worse than hollow but the hollow bent easily when I whacked
it into the ground. The stiff bar was a necessary improvement even at 6+ lbs. (3kg)

It's not bad to begin with, but a lil' annoying like previously mentioned at
a couple of rpm areas. (4400 and 5000 or so for me) Putt-putting around
town at 3300 rpms has never been an issue.

I have a few pieces of small stock for a better mount system if anyone has
some decent ideas. I have what was available at the time and fit. First in
order me supposes is getting some pics on here. Do I have 15 posts yet?
The straight bar is most perfect for parking lot-type tipovers. Even at full turn
of the handlebars the crashbar sticks out enough to keep plastic from hitting the
ground/ pavement. Offroad is a different story because it's rigid and can't hit solid
objects safely nor protect the plastic from a monster rock when I tip over while
out bumping and bouncing around in the bush.

CheeeeeeeeeeapAndStillThinking
 

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Discussion Starter #15
Well hit the highway, at highway speed the tach is at 4500, the vibration is much better in the handlebars and feet especially at lower rpms, but have picked up a new vibration...in the seat. Having the seat vibrate like an old hotels magic fingers bed isn't as much fun as one might think. I don't like vibration there, no I dont. Going to remove the radiator hose strips and try thin rubber up front.
 
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