2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 284Get this manual
CLUTCHSTARTER CLUTCHKICK STARTERGEARSHIFT LINKAGE (After '05) Check the kickstarter idle gear and bushing for damageMeasure the starter idle gear I.DSERVICE LIMIT: 21.07 mm (0.830 in) Measure the kickstarter idle gear bushing I.Dand O.DSERVICE LIMITS: I.D 17.04 mm (0.671 in) O.D 20.96 mm (0.825 in)
Measure the countershaft O.Dat the kickstarter idle gearSERVICE LIMIT: 16.95 mm (0.667 in)