Bike Wont Idle

If you run accross an XS that doesn't want to idle, and the caps have been removed from the idle mix screws beware! It is very easy to screw the tip down into the seat and have it seize and then twist the very tip of the needle off in the seat. Didn't do it personally, but had a hell of a time cleaning this mess up after a "certified Yamaha mechanic" worked on it.