Suzuki FD 110 XCS Service Manual page 58

• Lubricate valve stem seal with oil, and press-fit the seal into
position with a finger tip.
Do not reuse the stem seals.
VALVE SEAT WIDTH
• Coat the valve seat uniformly with Prussian blue. Fit the valve
and tap the coated seat with the valve face in a rotating man-
ner, in order to obtain a clear impression of the seating con-
tact. In this operation, use the valve lapper to hold the valve
head.
• The ring-like dye impression left of the valve face must be
continuous-without any break. In addition, the width of the dye
ring, which is the visualized seat "width", must be within the
following specification:
Standard
Valve seat width W: 0.9-1.1 mm
If either requirement is not met, correct the seat by servicing it
as follows.
VALVE SEAT SERVICE
The valve seat for both intake and exhaust valves are machined
to four different angles. (The seat contact surface is cut 45°)
INTAKE
SIDE
45° N -12
30° N - 126
60° N - 111
09916-21110: Valve seat cutter set
(N-111,126,121,122)
09916-24311: Solid pilot: (N-100-5.0)
NOTE:
The valve set contact area must be inspected after each cut.
09916-20630: Valve seat cutter set (N-126)
09916-24311: Solid pilot (N-100-5.0)
09916-21110: Valve seat cutter set
EXHAUST SIDE
45° N - 122
15° N - 121
ENGINE
EXHAUST
INTAKE
VALVE SEAT
VALVE SEAT
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