2001 520 exc rebuild

Hi I was getting my 520EXC ready this spring when i found a piece of steal in my bottom end oil screen, I am working on rebuilding the motor now, replacing seals and bearings, piston & rings, timing belt. Is there anything else that I should be looking at, and or any areas I should really be looking at for problems while I have it apart

thanks any help or suggestions would be greatly appreciated

Jim

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