I've lost one of the bolts for the stock seat (the rear one on the LH side with the handle - go figures), the bolt that holds the fork shaped support for the exhaust under the footpeg, and the top screw for the headlamp assembly. Still don't know how that top screw dissapeared, not like it could vibrate upwards too nicely. After that one I went around with blue gel loctite on everything I could reach, and green penetrating loctite on things that I didn't want to take off like engine mount and frame bolts. That green loctite is NICE for permanent things, and the blue gel is much easier to handle than the liquid stuff, and works on plastics too.