Vibration? Before you go injecting crap into your handlebars, you might want to first make sure your tires are in good nick. Make sure you have the proper amount of air in your tires and that they are seated on the wheels evenly. Check for dents and hops. Check for balance and if out of balance take them to a shop and get it done. Make sure everything that should be tight is tight and everything that should be free is free.