Checking The Valve Springs; Checking The Valve Lifters; Installing The Valves - Yamaha VMAX 2009 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)
40.78 mm (1.61 in)
Limit
38.74 mm (1.53 in)
Free length (exhaust)
40.78 mm (1.61 in)
Limit
38.74 mm (1.53 in)
2. Measure:
• Compressed valve spring force "a"
Out of specification → Replace the valve
spring.
Installed compression spring
force (intake)
186.00–214.00 N (18.97–21.82
kgf, 41.81–48.11 lbf)
Installed compression spring
force (exhaust)
186.00–214.00 N (18.97–21.82
kgf, 41.81–48.11 lbf)
Installed length (intake)
33.88 mm (1.33 in)
Installed length (exhaust)
33.88 mm (1.33 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°/1.8 mm
Spring tilt (exhaust)
2.5°/1.8 mm
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)
5-34