Bike knocking till warm and then rattling over 2500 rpms!
 

My bike has no loss of power but when cold it knocks till warm.. Then when it is warm and revved over 2500 rpms it has a rattle to it.. sounds like a loose screw rattling around. Wanting to know what everyone thinks the problem is and how much would it be for parts if you know what it is.. Not labor... It is a 2002 Honda CBR F4I...