Yamaha FJR1300A(D), Service Manual

Page: 329 / 662

VALVES AND VALVE SPRINGS
5-28
EAS24310
CHECKING THE VALVE SPRINGS
The following procedure applies to all of the
valve springs.
1. Measure:
• Valve spring free length “a”
Out of specification
→
Replace the valve
spring.
2. Measure:
• Compressed valve spring force “a”
Out of specification
→
Replace the valve
spring.
3. Measure:
• Valve spring tilt “a”
Out of specification
→
Replace the valve
spring.
EAS24320
CHECKING THE VALVE LIFTERS
The following procedure applies to all of the
valve lifters.
1. Check:
• Valve lifter
Damage/scratches
→
Replace the valve lift-
ers and cylinder head.
EAS24340
INSTALLING THE VALVES
The following procedure applies to all of the
valves and related components.
1. Deburr:
• Valve stem end
(with an oil stone)
Free length (intake)
39.73 mm (1.56 in)
Limit
37.74 mm (1.49 in)
Free length (exhaust)
39.73 mm (1.56 in)
Limit
37.74 mm (1.49 in)
Installed compression spring
force (intake)
136.00–158.00 N (13.87–16.11
kgf, 30.57–35.52 lbf)
Installed compression spring
force (exhaust)
136.00–158.00 N (13.87–16.11
kgf, 30.57–35.52 lbf)
Installed length (intake)
33.00 mm (1.30 in)
Installed length (exhaust)
33.00 mm (1.30 in)
b. Installed length
Spring tilt (intake)
2.5°/1.7 mm (2.5°/0.067 in)
Spring tilt (exhaust)
2.5°/1.7 mm (2.5°/0.067 in)