Honda VFR800F 2014 Service Manual page 207

CYLINDER HEADA/ALVES
Follow the
refacing
manufacturer's
operating
instructions.
Remove the
valve and
inspect the
valve seat face'
The
valve
seat contact should be within
the
specified
width
and even all around the circumference
STANDARD:
0.90
-
1.10
mm
(0.035 - 0'043
in)
SERVICE
LIMIT: 1'5 mm (0'06 in)
lf
the seat
width
[1] is
not
within specification, reface the
valve seat lPage
1O-23),
lnspect the
valve seat face for:
.
Uneven seat width:
-
Replace the
valve
and reface the valve seat'
.
Damaged face:
-
Repiace the
valve and
reface the valve seat'
The valves cannot be
ground. lf
a
valve face is burned
or badly
worn or
if it
contacts the seat unevenly, replace
the valve.
.
Contact area (too high or too low)
-
Reface the
valve
seat.
REFACING
Valve seat
cutters/grinders
or
equivalent
valve
seat
refacing equipment
are
recommended
to
correct worn
valve seats.
TOOLS:
Seat
cutter,
29
mm
(lN,
45')
07780'0010300
Seat
cutter, 27.5mm
(EX,45")
07780-0010200
Flat
cutter,
30
mm (lN,
32")
07780-0012200
Flat
cutter, 28
mm (EX,
32")
07780'0012100
lnterior cutter, 30
mm (IN/EX,
60")
07780-0014000
Cutter holder,4.5
mm
07781-0010600
or equivalent commerciallY
available in
U.S.A.
After cutting
the
seat, apply lapping compound
to
the
valve
face,
and lap the
valve
using light pressure
NOTICE
.
Excessive
lapping
pressure
may deform or damage
the
seat.
.
Change
the angle
of lapping tool [1]
frequently
to
prevent uneven seat wear.
.
Do
not
allow lapping compound to enter the guides'
After
lapping,
wash
all
residual compound
off
the
cylinder
head and valve.
'
45"
?
10-23