mutmatt,
I found exactly the same problem as you have. After 20 minutes at around 90kph my hands were numb! However I found the cure with a bit of plastic modification, and some washers from the hardware store and I could keep the TT hand guards, and be rid of the vibes.
http://www.xt660.com/showthread.php?p=96982#post96982
In the above thread, I have a few pics brief explanation of what I did to make the original bar end weights (at around 400 grams each!) fit with the TT guards. It seems that Yamaha did put them on for a reason after all

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Quote:
Originally Posted by
mudmatt
I have TT handguards on mine, and it now handles like a bag of spanners, vibration hell over 50mph
Looks nice but the bar end is made of alloy and light as a feather compared to the originals
Going back to the original Yamaha guards until i can find something thats more suitable
I understand the Barkbusters are quite meaty???
Anyone else suggest something thats not going to affect handling/vibration
Thanks in advance
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