Checking The Valve - Yamaha F115A Service Manual

POWR
a
VALVES
a
5300
5310
5320

CHECKING THE VALVE

1. Check:
• Valve
Damage/warpage → Replace.
2. Measure:
• Margin thickness a
Out of specification → Replace.
Margin thickness
IN: 0.8 - 1.2 mm
(0.031 - 0.047 in)
EX: 1.0 - 1.4 mm
(0.039 - 0.055 in)
3. Measure:
• Valve stem diameter a
Out of specification → Replace.
Valve stem diameter
IN: 5.975 - 5.990 mm
(0.2352 - 0.2358 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.
5-28
E
5