My friend has a 2001 GSXR 750. I'm sure everybody knows the noise that the GSXR's make, the loud engine. I haven't heard it personally, but he says it sounds just like that but louder. He just got done tearing the motor apart because of this noise. He found a bearing that was pretty tore up and replaced that rod also, as well as the piston rings and other rod bearings. The motor is started making the noise after a couple blocks of riding. Anybody have any ideas?