Installing The Valves - Yamaha 2010 XMAX YP125R Service Manual

2. Measure:
• Compressed valve spring force "a"
Out of specification → Replace the valve
spring.
Inner spring
Installed compression spring
force (intake)
76–88 N (7.75–8.97 kgf, 17.08–
19.78 lbf)
Installed compression spring
force (exhaust)
76–88 N (7.75–8.97 kgf, 17.08–
19.78 lbf)
Installed length (intake)
30.10 mm (1.19 in)
Installed length (exhaust)
30.10 mm (1.19 in)
Outer spring
Installed compression spring
force (intake)
115–133 N (11.73–13.56 kgf,
25.85–29.90 lbf)
Installed compression spring
force (exhaust)
115–133 N (11.73–13.56 kgf,
25.85–29.90 lbf)
Installed length (intake)
31.60 mm (1.24 in)
Installed length (exhaust)
31.60 mm (1.24 in)
b. Installed length
VALVES AND VALVE SPRINGS (YP250R)
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)
5-82
Inner spring
Spring tilt (intake)
2.5°/1.7 mm
Spring tilt (exhaust)
2.5°/1.7 mm
Outer spring
Spring tilt (intake)
2.5°/1.6 mm
Spring tilt (exhaust)
2.5°/1.6 mm
Recommended lubricant
Molybdenum disulfide oil