Suzuki AN650 2002 - Page 81

3-30 ENGINE
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.
[ 09916-10911: Valve rapper set
• 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 (0.035 – 0.043 in)
If the valve seat is out of specification, recut the seat.
VALVE SEAT SERVICING
• The valve seats for both the intake and exhaust valves are
machined to four different angles. The seat contact surface is
cut at 45°.
[ 09916-21111: Valve seat cutter set
09916-20630: Valve seat cutter (N-126)
09916-20640: 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 (09916-21111).

• When installing the solid pilot
1, rotate it slightly.
INTAKE EXHAUST
15° N-121
30° N-126
45° N-122 N-122
60° N-111 N-111
Exhaust
60˚
45˚
15˚
60˚ 45˚ 30˚
Intake
The valve seat contact area must be inspected after
each cut.