Suzuki GSX-R750, Service Manual

Page: 85 / 495

ENGINE 3-37
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 lapper 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, re-cut 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°.
INTAKE EXHAUST
15° N-121
30° N-126
45° N-122 N-122
60° N-111 N-111
[
09916-21111: Valve seat cutter set
09916-20630: Valve seat cutter (N-126)
09916-20650: Solid pilot (N-100-4.0)
NOTE:
The valve seat cutters (N-121), (N-122) and (N-111) are included
in the valve seat cutter set (09916-21111).
#
The valve seat contact area must be inspected after each
cut.
• When installing the solid pilot
1
, rotate it slightly. Seat the pilot
snugly. Install the 45° cutter, attachment and T-handle.