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Kawasaki KZ1300-A1 Quick Reference Manual Page 176

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MAINTENANCE--ENGINE
Measure the diameter of the valve stem with a micro-
meter.
Since the stem wears unevenly, take measure-
ments at four places up and down the stem, keeping
the micrometer at right angles to the stem.
Replace the valve if the stem is worn to less than
the service limit.
A. Valve Stem
Table
H20
Valve Stem Diameter
Inlet
Exhaust
Service Limit
6.90mm
6.89
mm
Valve guide
inspection
Remove
the valve, and measure the inside diameter
of the valve guide using a small bore gauge and micro-
meter. Since the guide wears unevenly, measure the
diameter at four places up and down the guide.
If
any measurement exceeds the service limit,
replace
the
guide.
Table
H21
Valve Guide Inside Diameter
Service Limit
7.08 mm
A. Small Bore Gauge
If a small bore gauge is not available, inspect the
valve guide wear by measuring the valve to valve guide
clearance with the wobble method, as indicated below.
Insert a new valve into the guide and set a
dial
gauge
against the stem perpendicular to it as close as
possible
to the cylinder head mating surface. Move the stem
back and forth to measure valve/valve guide clearance.
Repeat
the measurement in a direction at a right angle
to the fi rst.
If the reading exceeds the service limit, replace the
guide.
NOTE: The reading is not actual valve/valve guide clear-
ance because the measuring point is above the guide.
A.
Move the valve.
Table
H22
ValvelValve Guide Clearance
(Wobble
Method)
Inlet
Exhaust
Service Limit
0.23
mm
0.24 mm
Valve
seat inspection and repair
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
seating area is too
narrow,
heat transfer from the valve
176

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