Bought virtually new 2006 2000 classic. put kawasaki windshield on it. put lowers on it. shield is all the way down. My head/helmet vibrate/shake so bad that it is giving me double vision, is dangerous and i am at a loss as to what to do about it. Dealer said he has never heard of it. I told him to take it for a ride with my HJC helmet on and hold on because it will feel like his head is going to come off. Any help or suggestions is greatly appreciated. I don't drink but might start if it will help me here..........Thanks to all who reply. Love the motorcycle but must get to the bottom of this.