Yamaha XV19SX(C), Service Manual, Page: 295 / 494

VALVES AND VALVE SPRINGS
5-46
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.
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)
3. Install:
• Valve guide “1”
• Lower spring seat “2”
• Valve stem seal “3”
• Valve “4”
• Valve spring “5”
• Upper spring seat “6”
(into the cylinder head)
Installed compression spring
force (intake)
217.00–249.00 N (48.78–55.98 lb)
(22.13–25.39 kgf)
Installed compression spring
force (exhaust)
217.00–249.00 N (48.78–55.98 lb)
(22.13–25.39 kgf)
Installed length (intake)
32.66 mm (1.29 in)
Installed length (exhaust)
32.66 mm (1.29 in)
b. Installed length
Spring tilt (intake)
2.5 °/2.0 mm
Spring tilt (exhaust)
2.5 °/2.0 mm
Recommended lubricant
Molybdenum disulfide oil