2006-2014 Honda FourTrax ATV TRX250 EX TRX250X Service Manual, Page 139Get this manual
CYLINDER HEADVALVECAMSHAFT Remove the two bolts and tensioner lifter if necessary
INSPECTION
CAMSHAFT
Check the cam sprocket for wear or damageCheck the cam and journal surfaces of the camshaft for scoring, scratches or evidence of insufficient lubricationTurn the camshaft bearings with your fingerThe bearings should turn smoothly and quietly