See information here:
http://motorcycles.about.com/library/recalls/blmotorecalls093a.htmApparently this is a dangerous problem, as the motor can injest airbox screws, locking the engine and suddenly tossing off the rider. One would have thought that the slipper clutch would help with that. :/
If you've got one, pay attention to the recall and get it fixed. Last thing you want is for your bike to fail you. Just as Dan O'Brian.