I know exactly what you are talking about. It is the first thing I fixed on my Z when I got it. I already had aluminum handlebars (1st suggestion) I then added "Grip Puppies" which are foam covers that slip over your stock grips and for $10.00 they are worth it. Next and the best mod was a product called a "Vibranator". I got the ones with the barend weights since adding weight does reduce vibrations.
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