I have an aftermarket fuel screw on my 450X carb, and during the past 2 rides, it has backed out completely and rests on the starter case (loosely). The spring is still on the fuel screw, so its not like I lost it. The last ride, I had to duct tape the screw to keep it from backing out, which worked, but I am trying to determine why its backing out. Questions: 1) Is this typical of fuel screws?? In other words, should I just buy a new one, thread it in and forget about it? (this is assuming the problem is with the existing fuel screw). 2) Can you use Loctite on the threads? 3) What about applying a small amount of Teflon tape to the threads?? This would make it a little more difficult to turn, but on the other hand may keep it from vibrating out?? Any input would be valuable. I think I am going to buy a new fuel screw anyway, just to be on the safe side, but if somebody can answer questions 2 and 3, or provide advice on how to ensure the new one does not back out, that would be very much appreciated.