Honda rebel 250 Service Manual page 103

CYLINDER HEAD/VALVES
Install
a 45
degrees
finish cutter
and
cut
the seat
to
the
proper
width.
Make
sure
that
all
pitting
and
irregularities
are
removed.
Refinisb
if
necessary.
Apply
a
thin
coating
of
Prussian Blue
to
the valve
seat.
Press the vslve
through
the valve
guide and onto
the seat to
make
a
clear
pattern.
NOTE
•
The
location of the valve seat
In
relation
to the
valve face
is
very important
for
good sealing.
If
the contact area
is
too high
on
the valve, the 968t
mu6t
be
lowered using a 32 degrees
flat
cutter.
(1)
CONTACT TOO
HIGH
If
the contact area
is
too
low on
the
valve,
the
seat
must
be
raised using
a
60 degrees
inner
cutter.
Refinish
the
seat to specifications,
using
a
45 degrees
finish
cutter.
After cutting the
seat,
apply lapping
compound
to
the valve
face,
and
lap the
valve using
light
pressure.
Aftor lapping,
wash
all
residual
compound
off the cylinder
head and
valve.
NOTE
*
Do
not
allow lapping
compound
to
enter the guides.
7-13