Honda TRX400EX FOURTRAX 1999, Service Manual

Page: 97 / 263

CYLINDER
VALVE GUIDE
Check that the valve moves smoothly in the guide.
Check the valve for bending, burning or abnormal
wear.
Measure each valve stem O.D. and record it.
SERVICE LIMITS: IN: 5.46 mm (0.215 in)
E X 5.44 mm 10.214 in)
Ream the valve guide to remove any carbon build-up
before measuring the guide.
Insert the reamer from the combustion chamber side
of the head and always rotate the reamer clockwise.
TOOL
Valve guide reamer,
5.5 mm 07984
-
2000001 or
07984
-
only)
Measure each valve guide I.D. and record it.
SERVICE LIMIT 5.52 (0.217 in)
Subtract each valve stem O.D. from the correspond-
ing guide I.D. to obtain the stem-to-guide clearance.
SERVICE LIMITS IN: 0.12
mm
(0.005
in)
E X
0.14
(0.006 in)
If the stem-to-guide clearance exceeds the service
limit, determine if
a
new guide with standard
would bring the clearance within tolerance.
If
so,
replace any guides as necessary and ream to fit.
If the stem-to-guide clearance exceeds the service
limit
with a new guide, also replace the valve.
NOTE:
Inspect and the valve seats whenever the
valve guides are replaced (page 7-13).
7-1 1