Ok, i have a 2008 yz250f and i asked this question over at the yz250f forum and they said that a couple of you guys here have had the same problem as me so could you help me out. I was taking apart my bike today to clean all the plastics and there are these 2 bolt that wont come off for some reason. The bolts are the bolts that keep the shrouds on. The bolts on each side of the bike wont come off. All the other shroud bolts came off easily but these two. What happens is when i try to take the bolt off it moves about half a revoltion then tightens up again. The same thing happens on the other side of the bike with the same shroud bolt that is on the other side. I have never taken the bike apart so i dont think that the threads are messed up. Can anybody tell me whats going on. Thanks.