Suzuki SY413 Service Manual page 2871

6A1-42 ENGINE MECHANICAL (G13/G16 TYPE ENGINE)
D Inspect valve stem end face for pitting and wear. If pitting or wear
is found there, valve stem end may be resurfaced, but not so
much as to grind off its chamfer. When it is worn so much that
its chamfer is gone, replace valve.
D Seating contact width:
Create contact pattern on each valve in the usual manner, i.e.,
by giving uniform coat of marking compound to valve seat and
by rotatingly tapping seat with valve head. Valve lapper (tool
used in valve lapping) must be used.
Pattern produced on seating face of valve must be a continuous
ring without any break, and the width of pattern must be within
specified range.
Standard seating width
revealed by contact pattern revealed by contact pattern
on valve face
D Valve seat repair:
A valve seat not producing a uniform contact with its valve
or showing width of seating contact that is out of specified range
must be repaired by regrinding or by cutting and
regrinding and finished by lapping.
1. EXHAUST VALVE SEAT: Use valve seat cutters to make two
cuts as illustrated in figure. Two cutters must be used: the first
for making 155 angle, and the second for making 455 angle.
The second cut must be made to produce desired seat width.
Seat width for exhaust valve seat:
1.1 – 1.3 mm (0.0433 – 0.0512 in.)
1. Valve seat cutter
In
1.1 – 1.3 mm
(0.0433 – 0.0512 in.)
Ex