01 CBRF4i , cam chain tensioner, can anyone tell me what's involved w/replacing. I am hearing a swooshing/rattleing noise around the 5000/5500 rpm mark. I have been looking at forums and see that this is a known common issue w/the cbr. What are the steps in replacing it or is it best to take it into dealer? What is the cost in replacement, do it yourself replacement cost and dealer cost? Also, is it something that needs replacement or can you just leave it be ? Thanks in advance for your feedback.