Engine rattle/tapping on startup

[skittles6969]

Sorry to ressurect an old thread, but I'd like to know the outcome of the problem. My 06 busa has had the same rattle from new. Had it back to dealers half a dozen times, they couldn't hear it. I've noticed that it goes away(nearly) after a damn good thrashing, but returns when left to cool overnight. I've had the mechanics stethoscope on the top end, thinking along the lines of CCT, but the rattle is loudest at the starter idler casing. Any ideas about the cause/remedy?