Checking The Valve Springs; Checking The Valve Lifters; Installing The Valves - Yamaha FJR1300A(D) Service Manual

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.
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)
2. Measure:
• Compressed valve spring force "a"
Out of specification → Replace the valve
spring.
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)
VALVES AND VALVE SPRINGS
b. Installed length
3. Measure:
• Valve spring tilt "a"
Out of specification → Replace the valve
spring.
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)
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)
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