Between 5 and 6 grand, in fourth particularly, but other gears to a degree, accelerating or decelerating, the gas tank buzzes, mirrors too. The pegs and seat don't vibrate. It's puzzling. Anyone else encountered this?

It's normal.

http://www.gstwins.com/gsboard/index.php?topic=6787

My 91 does it... my 89 does not. Anyway the reason I believe is the rubber bushings on the sides on the tank are either worn out or missing. I found one on my driveway last weekend  :x  ... and its now making a nice accoustic echo... through the tank and inside it and on the skin... and I hear 8 octaves and its beautiful   ... just like a duc monster.
Cool.
Srinath.

Thanks, scratch. I actually checked the mounting bolts and all seemed OK. I'm glad it's no big deal. I might look for anything else that might be loose, but this little beast sure runs good.  Accelerating over a small hill in town the other day it tried to wheelie.  

Quote from: seshadri_srinathMy 91 does it... my 89 does not. Anyway the reason I believe is the rubber bushings on the sides on the tank are either worn out or missing. I found one on my driveway last weekend  :x  ... and its now making a nice accoustic echo... through the tank and inside it and on the skin... and I hear 8 octaves and its beautiful   ... just like a duc monster.
Cool.
Srinath.

Maybe I just need to tune my tank.  

Yeap I get this too.  Actually the rearsets seem to vibrate alot around 6000-7000RPM.  Sometimes I'm nervous it will make my feet numb while riding if I don't move them.  Not a good situation  

ASLAM.

Mine too, but only when my gas gets to aroung a half a tank, anyother time it doesn't.

Mine too, but only when my gas gets to aroung a half a tank, anyother time it doesn't.

Quote from: Ed_in_AzMaybe I just need to tune my tank.  

That's it!  If you drill a row of small holes in the tank, you really free-up the fuel flow , the stock tank is too constricted

I spent a summer trying to figure out a vibrating noise I had....fairly disconcerning.....until I layed up on the tank to listen closer...and what do you know it stopped!