Hello Jim,
You can find lots of info about this subject in the thumper section of advrider.com. I used those info and changed my carburator settings, jets and bought new exhaust which helped a lot for vibration. Also, I took out the Secondary Air System and another system which slows the bike in 2nd gear. I added some weights to handlebar too but that didnt make a big difference.
Ozgur
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