The srinath bar blues.

[dsmirnov83]

Ok, 1st off I wana say, this is NOT to start ANY kind of bad rep for Srinath...OK? (If we are all agreed, then read on).

I recently swapped my stock bars for a pair of Srinath's new style bars. (no bar ends)

Now there is VERY noticible vibration coming from the bar, but it's mostly on the left side. It should also be noted that it starts at about 4K RPM and starts to get better after 5.5k RPM.

Srinath had a suggestion that the clutch cable might be too tight, I'll check it out toady (weather permiting), but meanwhile are there any other posibilities? :dunno:
Is anyone else expierencing this??? :dunno:
-Denis S.

[MarkusN]

That's resonance for ya. Add a set of those dreaded bar ends and you'll shift the phenomenon down to an RPM range that you don't use all the time.

[aslam]

Yeah I think that may just be the nature of the beast, but get bar ends.  Plus I like the little bit of added protection they provide...

ASLAM.

[The Buddha]

It has to be somehting else... bar ends dot do it... not even the stock ones which are heavy heavy heavy.... Come on resident geniuses... KevinC... JamesG, BobB, many more... people that have studied vibration and balance etc... OK I am tempted to say carb synch... but then why would that go off with new handlebars... dont make sense to me.
Cool.
Srinath.

[JLKasper]

4000 to 5500...  Where have I heard this before?

This rev range seems to produce a range of vibrations and noises. I don't get the vibes, but the chattering noise that's nearly like turning on a switch at 3500-4000 and off again above 6000.  Does anybody out there have access to a good Suzuki mechanic who gets service bulletins regarding problems of this nature?  Does Suzuki even bother to perform this service?  

[dsmirnov83]

I fidled plenty with the clutch cable today, and there was no change weather I made the slack 1cm or 3.5cm.  :dunno:
I don't know if bar end will help, but I am bidding on some right now.
Ideas, I need Ideas...
-Denis S.

[destroyer]

You must run the heavy OEM bar ends on this bike.  The inline twin GS's are notorious for harmonic vibrations going through the handlebars.  Its not near as bad on the inline 4's, thats how they get away with running those cheap bar ends that are just for looks.  My suggestion to you is get some of the heavy lead weighted OEM ends and see if that cures the problem before you start tinkering with carb adjustments and such because that is not likely the case.

[The Buddha]

The bars he has weigh a ton... most People's GS'es are felled by the weight of the bars.... Just kidding, but his vibrates more... maybe I should make them lighter... I dunno. But more weight may change the rpm, Also try a carb synch, how is the bike to ride anyway... does it show signs of being out of synch or other crab issues.
Cool.
Srinath.

[Blueknyt]

ah, i might be an idiot, but would seem to me, the main transmitter of vibes to the bars is how they are attached, if your little rubber Buffers are screwed or gone this is gonna send those vibes right on through the bolts that hold the top plate on.  the bolts have buffers and there are 4 tiny little square buffers that sit between plates.  try cuting some chunks of old tire and sandwhiching them between.

[MarkusN]

The bars he has weigh a ton...

It's not weight alone. Resonance frequencies are a result of the weight / stiffness ratio. As the heavy bars are also stiffer, that elevates the resonance frequency again. (Weight higher -> resonance lower, stiffness higher -> resonance higher) Weight at the end and stiffness at the root affect the most.

[Turkina]

ah, i might be an idiot, but would seem to me, the main transmitter of vibes to the bars is how they are attached, if your little rubber Buffers are screwed or gone this is gonna send those vibes right on through the bolts that hold the top plate on.  the bolts have buffers and there are 4 tiny little square buffers that sit between plates.  try cuting some chunks of old tire and sandwhiching them between.

I have an old bicycle inner tube that I cut up for things like this, whether for rubbing or vibrations.  I just bought a pair of LSL superbike low aluminum bars, so I'm going to have to deal with the vibrations.  I'm thinking sandwiching some inner tube between the handlebar clamps and around the bar themselves.  I'm thinking a good carb synch will eliminate most of the serious vibes, as well.

[dsmirnov83]

I think I'll try the iner tube idea, thanks turkina!
When I had the stock ones on last week, there was no vibe comin from them, so I'm thinking the carbs are fine... I'll play around and let you all know. Thank you all for your ideas. More is always welcome.
-Denis S.

[Turkina]

Only problem is, it's only going to dampen vibrations a little.  Wrap too much inner tube around the handlebar, and it won't fit in the clamp.  You could also mix some lead shot with silicone caulk and stuff an equal amount in each bar end if the bars are hollow, and then put aftermarket stopper bar ends on.  I know I read something like that on a post here...  Bar snakes won't work on clubman style bars, the way they are welded.  :dunno:

[AR5ENAL]

How would you stuff it in?  Turkey baster?  :dunno:

[Turkina]

Hmmm, make me think, why don't you.... Caulk takes a few minutes to even start to set, so you could mix the stuff, put it in a heavy duty ziploc freezer bag, snip off the corner, and do the pastry chef thing.   :dunno:  Liquid bar snake is some dense elastomer that dampens vibrations, so mixing lead shot and caulk should give similar characteristics.

[dsmirnov83]

OK, iner tube and bar ends installed. The vibes are bone. Thanks all.
-Denis S.

[Old Mr. Wilson]

Everything was fine (aside from my dissatisfation with the original look) until I "installed the new bars".  Then all went to hell in a handbasket.
I know how THAT goes!