2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 208Get this manual
CYLINDER HEADVALVE For cam chain tensioner lifter inspection, see
INSPECTION
CAMSHAFT Turn the camshaft bearings with your fingerThe bearings should turn smoothly and quietlyFor bearing replacement in the camshaft holder, see page 11-14
page 12-9Check the sprocket teeth for wear or damage
Check the cam surfaces for scoring, scratches or evidence of insufficient lubricationMeasure each cam lobe heightSERVICE LIMITS: '04'05; IN: 36.48 mm EX: 34.60 mm After '05; IN: 34.89 mm EX: 34.06 mm Intake (1.436 in) (1.362 in) (1.374 in) (1.341 in)