If it just started . Check oil level then pull filter and check for metal. If metal is found pul it . Dont run it with a problem because the cams are driven from the tranny side. Metal wipes the chain slides and pumps.
Bike had been setting but had a oil leak at the water pump weep hole. So pulled motor and replaced. Changed all oils and went for a test ride. That???s when I heard noise. All looked good inside when I pulled covers to change.
Well I would double check chain tension of the drive chain . I guess I would have to hear it myself. Any noise other than normal dale rattle is always of great concern.