Inspection; Reed Valve - Yamaha 50G Service Manual

POWR

INSPECTION

4. Using dial gauges, measure the deflec-
tion.
Maximum deflection:
50, 60, 70 hp:
0.03 mm (0.0012 in)
75, 80, 90 hp:
0.05 mm (0.0020 in)
If the deflection is greater than the spec-
ified maximum, correct the alignment
by use of a copper hammer and a
wedge.
If the deflection is greater than the spec-
ified maximum, replace the crankshaft
assembly.
G64000-0*

REED VALVE

INSPECTION
1. Visually inspect for warping of the reed
valve. If warped, measure the distortion
with feeler gauges.
Warpage limit a:
0.2 mm (0.01 in)
If the amount of warping is greater than
the specification, replace the reed valve.
2. Using a vernier caliper, measure the
valve stopper height.
Valve stopper height b:
50, 60 hp:
3.0 ± 0.2 mm (0.12 ± 0.01 in)
70, 75, 80, 90 hp:
9.9 ± 0.2 mm (0.39 ± 0.01 in)
If the valve stopper height is outside the
specification, adjust it by bending it.
3. Visually inspect for cracks on the reed
valve. If cracks are found, replace the
reed valve.
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E