Checking The Valve Spring - Yamaha F6AMH Service Manual

CAMSHAFT AND VALVES
4. Measure:
Valve stem outside diameter


Out of specification
Valve stem outside diameter
Intake valve:
Exhaust valve: 5.460 - 5.475 mm
5. Measure:
Valve stem runout


Out of specification
Valve stem runout limit
(intake valve and exhaust valve):
0.03 mm (0.0012 in)
NOTE:
When replacing the valve, always use a
new valve guide and valve stem oil seal.

CHECKING THE VALVE SPRING

1. Measure:
Valve spring free length


Out of specification
Valve spring free length limit
27.6 mm (1.09 in)
2. Measure:
Valve spring tilt


Out of specification
Valve spring tilt limit
1.0 mm (0.04 in)
5-46
d
Replace.

d
:
5.475 - 5.490 mm
(0.2156 - 0.2161 in)
(0.2150 - 0.2156 in)
Replace.

a
Replace.

a
:
b
Replace.

b
: