I lost a header nut, the front fender bolts, the upper fairing middle stay bolts and the front engine mount bolts. When the fender comes loose it gets pulled around by the front tire and stretches the brake lines. This has adverse affect on braking performance. When my upper fairing came loose it didn't fall off but flopped around pretty bad, pulled the headlight connector loose. Strangely, there were no noticeble effects from loosing the front engine mount bolts.