2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 129Get this manual
CYLINDER HEADVALVE VALVEVALVE GUIDE
Check that the valve moves smooth ly in the gu ideCheck the valve for bending, burning or abnorma wearMeasure each valve stem a.Dand record it
SERVICE LIMITS: IN: 5.46 mm (0.215 in) EX5.44 mm (0.214 in)
Ream the guides to remove any carbon build-up before measuring the guideInsert the reamer from the combustion chamber side of the head and always rotate the reamer clockwise
Valve guide reamer, 5.5 mm 07984-2000001 or 07984-2000000 (U .S.Aonly)
Measure each valve guide 1.0 and record it
SERVICE LIMIT: INEX: 5.52 mm (0.217 in)
Subtract each valve stem 0.0from the corresponding guide 1.0to obtain he stem-to-guide cle arance
SERVICE LIMITS: IN: 0.1 mm (0.005 in) EX; 0.14 mm (0.006 in)