1999-2002 TRX400EX Fourtrax Service Manual, Page 91Get this manual
CYLINDER HEADVALVE
CYLINDER HEAD COVER DISASSEMBLY
Hold the cylinder head cover securely and loosen the sub-rocker arm shafts, being careful not to damage the mating surface of the cylinder head coverRemovethe shafts, sealing washers, sub-rocker arms and wave washers
Hold the cylinder head cover securely and loosen the rocker arm shafts, being careful not to damage the mating surface of the cylinder head coverRemovethe shafts, sealing washers and rocker arms
INSPECTION
CAMSHAFT Check the cam and journal surfaces of the camshaft for scoring, scratches or evidence of insufficient lubricationCheck the oil holes in the camshaft for cloggingTurn the outer race of each bearing with your fingerThe bearings should turn smoothly and quietlyReplace the bearing if the outer race does not turn smoothly and quietly