When I start out there is clunking noise from near the front sprocket. At first I thought it just needed a chain adjustment but not so. I pulled the front sprocket cover and the only thing that I can see is the roller has some side ways slop, It does rotate on the swing arm which I assume is what it is supposed to do. Any ideas on what it might be, Would the swing arm bearings cause this noise? the chain roller or something else?