Installing The Valves - Yamaha Star XVS13AA(C) 2011 Service Manual

2. Measure:
• Compressed valve spring force "a"
Out of specification → Replace the valve
spring.
Installed compression spring
force (intake)
171.00–197.00 N (17.44–20.09
kgf, 38.44–44.29 lbf)
Installed compression spring
force (exhaust)
171.00–197.00 N (17.44–20.09
kgf, 38.44–44.29 lbf)
Installed length (intake)
35.00 mm (1.38 in)
Installed length (exhaust)
35.00 mm (1.38 in)
b. Installed length
3. Measure:
• Valve spring tilt "a"
Out of specification → Replace the valve
spring.
Spring tilt (intake)
2.5°/1.9 mm (2.5°/0.07 in)
Spring tilt (exhaust)
2.5°/1.9 mm (2.5°/0.07 in)
VALVES AND VALVE SPRINGS
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)
2. Lubricate:
• Valve stem "1"
• Valve stem seal "2"
(with the recommended lubricant)
Recommended lubricant
Molybdenum disulfide oil
3. Lubricate:
• Valve stem end
(with the recommended lubricant)
Recommended lubricant
Engine oil
4. Install:
• Lower spring seat "1"
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