Hmm....i think the threads are a brass insert which is molded into the plastic airbox and probably came loose in the plastic it's embedded in. In that case i would think you could yank the cover off and the insert should come with it. then grip the brass insert with a pliers and turn the bolt out. Then glue the brass thread insert back into the hole in the airbox. JB weld is a good product that will make it stay put. Stuff dries like steel and is impossible to break off. But anyways, this is just what i *think* has happened because the threads definatly aren't plastic. And i recall seeing a brass insert in all 2 screw holes.