Honda Z50A Manual page 16

14
<D
Vernier caliper
@
Valve spring
Fig.
23
(D
Micrometer
@
Camshaft
Fig. 24
(D
Cylinder gauge
Fig. 25
(D
''O" mark
@
Key
Fig. 26
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6. Inspecting the valve spring •
Measure the length of the valve spring
free length with a vernier caliper.
Standard Value
1.11 (28.1 mm)
Serviceable Limit
Replace if under
1.06 (26.9
mm)
7. Inspecting the camshaft
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Measure the cam lift with a micrometer •
Item Standard Value
Serviceable Limit
Base circle
0.825
Replace if under
(21.0
mm) 0.819 (20.8 mm)
Cam lift
(including 1.025
Replace if under
the base (26.076 mm) 1.015 (25.8
mm)
circle)
8. Measuring the inside diameter of the
cylinder
Use a cylinder gauge and measure the
inside diameter of the cylinder at the
top, center and bottom in both the x
and Y axes. If the cylinder is excessively
worn. it should be either rebored or
replaced with a new cylinder depending
upon the extent of wear (Fig. 25).
Standard Value
1.5358-1.5362
(39.01-39.02 mm)
Note:
Serviceable Limit
39.1 (1.540
mm)
When reboring the cylinder. it must
be rebored to an oversize units of
0.010 (0.25 mm) up to a maximum of
0.40 (1.0 mm) since the piston and
the piston ring sets comes in those
oveisizes only.
D. Reassembly
Perform the reassembly in the reverse order
of disassembly which was described in page
9 section B. however. follow the procedure
below for timing the valves.
Position the key of the left crankshaft so
that it is pointing toward the cylinder head.
and position the cam that the "0" marking
on the cam sprocket is at the topmost
position (Fig. 26).
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