Yamaha YZF-R6 99 Service Manual page 156

VALVES AND VALVE SPRINGS
2. Measure:
S compressed spring force a
Out of specification ! Replace the valve
spring.
b Installed length
3. Measure:
S valve spring tilt a
Out of specification ! Replace the valve
spring.
EAS00242
CHECKING THE VALVE LIFTERS
The following procedure applies to all of the
valve lifters.
1. Check:
S valve lifter
Damage/scratches ! Replace the valve lift-
ers and cylinder head.
EAS00247
INSTALLING THE VALVES
The following procedure applies to all of the
valves and related components.
1. Deburr:
S valve stem end
(with an oil stone)
2. Lubricate:
S valve stem 1
S oil seal 2
(with the recommended lubricant)
4-28
ENG
Compressed spring force
(installed)
Intake valve spring inner
7.0 8.0 kg at 30.0 mm
Intake valve spring outer
11.6 13.4 kg at 32.5 mm
Exhaust valve spring
16.3 18.7 kg at 36.1 mm
Max. Spring tilt
Intake valve spring inner
1.6 mm
Intake valve spring outer
1.7 mm
Exhaust valve spring
1.8 mm
Recommended lubricant
Molybdenum disulfide oil