Honda VF1000F 1985 Shop Manual page 139

CYLINDER HEAD/VALVE
NOTE
Ream the guides to remove any carbon build-up before
checking clearances.
Measure and record each valve guide 1.0, using a ball gauge or
inside micrometer.
'SERVICE LIMIT: 5.55 mm (0.219 in)
Subtract each valve stem 0.0. from the corresponding guide
1.0. to obtain the stem-To-guide clearance.
SERVICE LIMIT: IN: 0.08 mm (0.003 in)
EX: 0.10 mm (0.004 in)
NOTE
If the stem-ta-guide clearance exceeds the service limits,
determine if a new guide 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 limits with
new guides, replace the valves.
NOTE
Reface the valve seats whenever the valve guides are
replaced (page 10-12).
VALVE GUIDE REPLACEMENT
Heat the cylinder head to 100°C (212°F) with a hot plate or
oven.
CAUTION
Do not use a torch to heat the cylinder; it may cause
warping.
1
To avoid bums, wear heavy gloves when handling the
heated cylinder head.
11) VALVE GUIDE REAMER 07984-2000000
-----~---.-
.
Support the cylinder head and drive out the old guides from (1) VALVE GUIDE REMOVER, 5.5 mm 07742-0010100
the combustion chamber side of the cylinder head.
Drive new guides in from the rocker arm side of the cylinder
head.
NOTE
Cylinder head heat should still be at 100'C (212°F) for
installation of the new guides.
10-11