I have a 1992 cbr600 f2. When the motor is cold it sounds fine. But after it gets to normal operating temp it begins to rattle from the top right side of the motor. It is the loud at idle, but I can't hear it above 2500 RPM. A friend of mine has a 1994 f2 that does the same thing but not as loud. It some times goes away after a minute or two. Is this the camchain tensioner going bad? The bike has 19000 miles on it.