Well, I have 4K and my bike has made noise since new, it doesn't sound like a rod knocking and it doesn't sound like valve clatter, its on the right, rear side of the motor and it only does it cold and at slow idle. What else could it be? This is one of those things that may never fail(I used to be worried about blowing the #3 rod in a ZX11, 15K, never blew)but I dont want to be stranded in the middle of nowhere without a cell phone, laying on my a$$ after the motor locked up at 150+mph. Whats 50 bucks? But I do have warranty so I may wait a little while and see how many Y2K failures show up.BTW, my buddy has a 99 with the recall, it made the same noise before and after the recall, its still running 7K