2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 272Get this manual
CLUTCHSTARTER CLUTCHKICK STARTERGEARSHIFT LINKAGE (After '05) Judder springspring seat Check the judder spring and seat for damage or warpageJUDDER SPRING
SPRING SEAT Clutch center Check the grooves of the clutch center for damage or wear caused by the clutch platesReplace if necessary
GROOVE Clutch outer Check the slots in the clutch outer for nicks, cuts or indentations made by the clutch discsCheck the primary driven gear teeth for wear or damage