Suzuki VZ800 Service Manual page 80

3-34 ENGINE
• The ring-like dye impression left on 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:
 Valve seat width W
Standard: 0.9 – 1.1 mm (0.035 – 0.043 in)
 09916-10911: Valve lapper set
If either requirement is not met, correct the seat by servicing it
as follows:
VALVE SEAT SERVICING
The valve seats for intake and exhaust valves are machined to
four different angles. The seat contact surface is cut at 45°.
15°
30°
45°
60°
NOTE:
The valve seat contact area must be inspected after each cut.
 09916-21111: Valve seat cutter set
09916-22430: Valve seat cutter (N-128)
INTAKE EXHAUST
N-121
N-128
N-128 N-122
N-111
45˚
15˚
Valve seat
EXHAUST
60˚
30˚
45˚
Valve seat
INTAKE