2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 126Get this manual
CYLINDER HEADVALVE Remove the following- thrust washerone-way clutch (clutch outer, rollers and springs)reverse decompressor camdecompressor camcam spring
INSPECTION
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DECOMPRESSOR CAM
ONE-WAY CLUTCH
Check the one-way clutch outer, rollers and springs for wear or damageCheck each cam for wear or damage
REVERSE"-DECOMPRESSOR CAM WASHER _ CAM SPROCKET FLANGE
CLUTCH OUTER PIN
Lubricate the cams, one-way clutch and washerInstall he cam spring into the camshaft ho le, then install the decompressor cam while pressing th springAssemble the reverse decompressor cam and clutch outer with the stopper pin, and install them onto th camshaft