2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 223Get this manual
CYLINDER HEADVALVE rocker arm (apply molybdenum oil solution to the pivot) rocker arm shaft
new stopper clip
decompressor arm (apply engine oil to the pivot surface) return spring (hang the bent end over the lifter arm and set the straight end against the stopper) lifter arm (so the arms are lined up straight, and apply molybdenum oil solution to the roller surface)