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Valve Stem Diameter Inspection; Valve Guide Inside Diameter Inspection; Valve To Guide Clearance Measurement - Kawasaki KLX110 Service Manual

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4-30 ENGINE TOP END
Valves

Valve Stem Diameter Inspection

Measure the diameter of the valve stem.
Valve Stem Diameter [A]
Standard:
Exhaust valve 4.462 ∼ 4.472 mm (0.1757 ∼ 0.1761 in.)
Inlet valve
Service Limit:
Exhaust valve 4.44 mm (0.1748 in.)
Inlet valve
Replace the valve if the stem is worn to less than the
service limit.

Valve Guide Inside Diameter Inspection

If a small bore gauge and micrometer are available, mea-
sure the valve guide as follows.
Measure the inside diameter [A] of the valve guide. Since
the guide wears unevenly, measure the diameter at four
place up and down the guide.
Valve Guide Inside Diameter
Standard:
4.500 ∼ 4.512 mm (0.1772 ∼ 0.1776 in.)
Exhaust
4.500 ∼ 4.512 mm (0.1772 ∼ 0.1776 in.)
Inlet
Service Limit:
Exhaust
4.58 mm (0.1803 in.)
Inlet
4.58 mm (0.1803 in.)
If any measurement exceeds the service limit, replace the
valve guide.

Valve to Guide Clearance Measurement

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 [A] into the valve guide [B] 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 [C] to measure valve/valve
guide clearance.
Valve/Valve Guide Clearance (Wobble Method)
Standard:
0.05 ∼ 0.08 mm (0.002 ∼ 0.003 in.)
Exhaust
0.02 ∼ 0.06 mm (0.0008 ∼ 0.002 in.)
Inlet
Service Limit:
Exhaust
0.19 mm (0.0075 in.)
Inlet
0.17 mm (0.0067 in.)
4.475 ∼ 4.490 mm (0.1762 ∼ 0.1768 in.)
4.46 mm (0.1756 in.)

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