Valve Inspection; Service Points - Yamaha F100A Service Manual

POWR
a
VALVES
a

SERVICE POINTS

Valve inspection

1. Inspect:
Valve
Damage/warpage → Replace.
2. Measure:
Margin thickness a
Out of specification → Replace.
Margin thickness:
IN: 0.45 ~ 0.65 mm
(0.018 ~ 0.026 in)
EX: 0.65 ~ 0.85 mm
(0.026 ~ 0.033 in)
3. Measure:
Valve stem diameter a
Out of specification → Replace.
Valve stem diameter:
IN: 5.975 ~ 5.990 mm
(0.235 ~ 0.236 in)
EX: 5.960 ~ 5.975 mm
(0.2346 ~ 0.2352 in)
4. Measure:
Valve stem runout
Out of specification → Replace.
Valve stem runout limit:
IN and EX: 0.03 mm (0.001 in)
NOTE:
The valve guide, valve seal, and valve
should be replaced as a set.
5-27
E