Suzuki DR-Z400S 2001 Service Manual page 69

3-26 ENGINE
VALVE SEAT WIDTH
Coat the valve seat uniformly with prussian blue. Install the
valve and attach a valve lapper onto it. Tap the coated seat
with the valve face in a rotating manner, in order to obtain a
clear impression of the seating contact.
09916-10911: Valve lapper set
The ring-like dye impression left on the valve face must be
continuous, without any breaks. In addition, the width of the
dye ring, which is the valve seat width, must be within the
following specification.
Valve seat width W
Standard: 0.9 – 1.1 mm (0.035 – 0.043 in)
If the valve seat is out of specification, re-cut the seat.
VALVE SEAT SERVICING
The valve seats for both the intake and exhaust valves are ma-
chined to three different angles. The seat contact surface is cut
at 45°.
45°
15°
30°
60°
For USA
Valve seat cutter: N-114, N-121, and N-128
Solid pilot:
For the other countries
09916-21110: Valve seat cutter set
09916-22420: Cutter N-128
09916-22430: Cutter N-114
09916-20610: Cutter N-121
09916-24311: Solid pilot N-100-5.0
NOTE:
Use the solid pilot N-100-5.0 along with the valve seat cutters
N-114, N-121, and N-128.
The valve seat contact area must be inspected after
each cut.
Intake Exhaust
N-128
—
N-128
N-114
N-100-5.0
N-128
N-121
—
N-114
intake exhaust
60˚ 60˚
30˚
45˚
15˚
45˚