I have the bike jacked up and was checking the head bearing for looseness. Everything is tight front to back but as I swing the handlebars from lock to lock I do feel a tendency for the bars to want to center. In other words, if I move the bars slowly past center either left or right the bars seem to seek the straight ahead position. Kind of feels like a flat spot. Is this normal, something like a self centering feature, or is this a sign of bad bearings? The bike has 40,000 miles on it. Thanks guys.