2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 211Get this manual
CYLINDER HEADVALVE Take care not to drop the nuts and washers into the crankcase
four nuts and washers (by loosening them in crisscross pattern in several steps) cylinder head
NUTS AND WASHERS
NOTE: Do not strike the cylinder head too hard and do not damage the mating surface with screwdriver
CYLINDER HEAD gasket dowel pins cam chain guide CHAIN GUIDE