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Maintenance; Cylinder Head, Valves - Kawasaki KZ1300-A1 Quick Reference Manual

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SUPPLEMENT --1981 MODEL
Maintenance
CYLINDER HEAD, VALVES
Valve seat cutters (special tools) are newly designed,
and the repair procedures are changed a
little.
But, new
seat cutters are available for the models before 1981
model. Refer to Pgs. 173-180, noting the
following.
Valve, Valve Guide, Valve Seat
Valve inspection, valve guide inspection and valve
stem height inspection procedures are the same as those
for the 1979 Kl 1300-A 1.
Valve Seat Inspection
The valve must seat in the valve seat evenly around
the circumference over the specified area. If the seating
area is too wide, the seating pressure per unit of area is
reduced, which may result in compression leakage and
carbon accumulation on the seating
surface.
If the seat·
ing area is too
narrow,
heat transfer from the valve is
reduced and the valve will overheat and warp. Uneven
seating or seat damage will cause compression
leakage.
eRemove the valve, and check to see if the valve and
valve guide are in good condition before valve seat
inspection.
eApply machinist's dye to the valve seat, and then use a
lapper to tap the valve lightly into
place.
eRemove the valve, and note where the dye adheres to
the valve seating
surface.
The distribution of the dye
on the seating surface gives an indication of seat con·
dition.
elf
the distribution of the dye shows uneven seating or
seat damage, or if the width or outside diameter of
seating surface is out of the specified range, repair the
valve
seat.
Table N11
Valve Seating Surface
Inlet
Exhaust
Outside Diameter
33.5 mm
28.5 mm
Width
0.5-1.0 mm
0.5-1.0 mm
. Valve
2. Seating Surface (45°)
3.
Outer Surface (32°)
4.
Valve Seat
5. Inner Surface (60°)
Valve Seat Repair
A valve scat which requires repair is cut with a set of
valve seat cutters. Six seat cutters are required for
com·
plete repair
;
two 32°; two 45°
;
and two 60° scat
cutters,
one for the inlet and the other for the exhaust.
NOTE: When using the cutter, be sure to apply engine
oil to the cutting part before grinding and also wipe off
ground particles adhering to the cutter with washing oil.
e
First, cut the seating surface of the valve seat with the
45° seat cutter, cutter holder and bar (special tools).
Cut only the amount necessary to make a good
surface;
overcutting will reduce the valve clearance, possibly
making it no longer
adjustable.
Cutting Valve Seat
1. Bar (57001·1128)
2.
7.0 mm Cutter Holder (57001·1126)
3. Seat Cutter
First Step
1.
Cut Seating Surface with following
cutters.
Exhaust: #3 Seat Cutter (57001-1115)
Inlet
:
#4 Seat Cutter (57001-1116)
eNext,
cut the outermost surface with the outside cutter
so that the valve seating surface will have the specified
outside diamater.
eThen,
cut the surface inside the seating surface with
inside cutter so that the seating surface will have the
specified width.
315

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