2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 306Get this manual
CRANKCASETRANSMISSIONCRANKSHAFTBALANCER ('04'05) Inspect the shift drum journals for scoring, scratches or evidence of insufficient lubricationCheck the shift drum guide grooves for abnormal wear or damage
Check the shift fork shafts for abnormal wear or damageMeasure each shift fork shaft O.DSERVICE LIMITS: Left and right: 11.97 mm (0.471 in) Center: 10.97 mm (0.432 in)