2007-2009 Honda TRX300EX TRX300X service manual, Page 122Get this manual
CYLINDER HEADVALVE INSPECTION CAMSHAFT
Check the cam sprocket for wear damageTurn each bearing outer race with your fingerThe bearings should turn smoothly and quietlyAlso make sure the bearing inner race fits tightly onto the camshaftRepace the camshaft bearings in pairs
CAMSHAFT BEARINGS
Remove and discard both bearings if either race does not turn smoothly, quietly, or if they fit loosely on the camshaft
Measure each cam lobe height
SERVICE LIMITS: IN: 35.571 mm (1.4004 in) EX: 35.584 mm (1.4009 in)