2004-2005 Honda TRX450R Factory Sevice Manual, Page 144Get this manual
CYLINDER HEADIVALVE EXHAUST ROCKER ARM SHAFT
Inspect the sli di ng surfaces of the rocker arms and shaft for wea or da ma geIf the roller is excessive worn or dam agedinspect the cam lob and oil passage
Measu re each rocker arm I.DSERVICE LIMITS: 12.05 mm (0.474 in)
Measure the shaft .0 at the rocker arm sliding
areasSERVICE LIMIT: 11.92 mrn (0.46 in)
Calculate the rocker arm-to-shaft clearanceSERVICE LIMIT: 0.10 mm (0.004 in)