Probably a good question for your dealer. I would be inclined to not worry about it. I have the same thing on my FJR with over 6,000 miles on it. Don't forget that when sitting idle, most of the oil will drain back down to the crankcase and on start-up there will not be as much in the head where valve actuation tappets are moving. With pressure from the oil pump coming up after start and oil under pressure is delivered to the area, the noise goes away.