Suzuki DL650 Service Manual page 95

3-44
E N G I N E
VALVE SEAT WIDTH INSPECTION
Visually check for valve seat width on each valve face.
If the valve face has worn abnormally, replace the valve.
Coat the valve seat with Prussian Blue and set the valve in
place-Rotate the valve with light pressure.
Check that the transferred blue on the valve face is uniform all
around and in center of the valve face.
0991 6-1 091 1 : Valve lapper set
If the seat width
@
measured exceeds the standard value, or
seat width is not uniform reface the seat using the seat cutter.
Valve seat width
@
Standard: 0.9
-
1.1 mm (0.035
-
0.043 in)
VALVE SEAT SERVICING
The valve seats
@
for both the intake valve
@
and exhaust
valve
@
are machined to four different angles. The seat contact
surface is cut at 45
".
EXHAUST
N-121
0991 6-21 1 1 1 : Valve seat cutter set
0991 6-22430: Valve seat cutter (N-128)
0991 6-20640: Solid pilot (N-100-4.5)
NOTE:
*
The valve seat cutters (N-121), (N-122) and (N-111) are
included in the valve seat cutter set (0991 6-27 11 1).
*
Use the solid pilot (N- 100-4.5) along with the valve seat cutter.
The valve seal contact area must be inspected after
each cut.
When installing the solid pilot
@,
rotate it slightly. Seat the
pilot snugly. Install the 45
"
cutter, attachment and T-handle.