I was riding my 2001 XR650R yesterday. When I came to a stop and the bike was idling I heard a loud metal to metal grinding. I immediatley shut it off. I checked the oil level-good, I checked the valve clearances-good .006 intake & .008 exhaust. After restarting it I hear a loud tapping noise.Its not coming from valve train. Has anyone expierenced this problem? I'm thinking it sounds like a wrist pin but, I will not know until I disassemble it. Any info would be greatly appreciated.