Recently bought a used 2012 FZ8. Love the bike, but I have noticed as soon as I arrive at 5000 rpm the vibration in the handlebars and seat increases dramatically. Is there something I should look into, or do other fz8's have this issue.Naturally I am shying away from really opening it up, and I really don't want to go down that route. It only has 6300 miles on it.