Checking The Valve Lifters; Installing The Valves - Yamaha YZF-R1S Service Manual

VALVES AND VALVE SPRINGS
2. Measure:
S compressed valve 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.
EAS00245

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)
5-32
ENG
Compressed valve spring force
(installed)
Intake valve spring
145.9 X 167.9 N
(14.88 X 17.12 kg,
32.80 X 37.74 lb) at
32.65 mm (1.285 in)
Exhaust valve spring
164.1 X 188.9 N
(16.73 X 19.26 kg,
36.89 X 42.46 lb) at
32.82 mm (12.92 in)
Spring tilt limit
Intake valve spring
1.7 mm (0.07 in)
Exhaust valve spring
1.7 mm (0.07 in)