Suzuki VL125 Service Manual page 63

3-28 ENGINE
VALVE SEAT WIDTH INSPECTION
Visually check for valve seat width on each valve face.
If the valve face has worn abnomally, 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.
If the seat width W measured exceeds the standard value, or
seat width is not uniform reface the seat using the seat cutter.
# Valve seat width W
Standard: 0.9 – 1.1 mm
Service Limit: Reface if measurement does not
agree with standard value.
! 09916-10911: Valve lapper set
VALVE SEAT SERVICING
The valve seats 1 for both the intake and exhaust valves are
machined to four different angles. The seat contact surface is cut
at 45°.
45°
15°
32°
! 09916-21111: Valve seat cutter set
09916-24470: Valve seat cutter (N-131)
09916-24460: Valve seat cutter (N-130)
09916-22610: Valve seat cutter (N-144)
09916-20460: Solid pilot (N-100-4.5)
NOTE:
Use the solid pilot along with the valve seat cutter.
"
The valve seat contact area must be inspected after each
cut.
INTAKE EXHAUST
N-131
N-144
15°
N-131
N-130
32°
32˚
For intake
For exhaust
45°