Yamaha YZF-R1S Service Manual page 255

VALVES AND VALVE SPRINGS
2. Lubricate:
S valve stem 1
S valve stem seal 2
(with the recommended lubricant)
3. Install:
S valve 1
S lower spring seat 2
S valve stem seal 3
S valve spring 4
S upper spring seat 5
(into the cylinder head)
NOTE:
Install the valve spring with the larger pitch a
facing up.
b Smaller pitch
NOTE:
Make sure that each valve is installed in its origi-
nal place. Refer to the following embossed
marks.
Right and left intake valve(-s): "5VY :"
Middle intake valve(-s): "5VY
Exhaust valve(-s): "5VY"
4. Install:
S valve cotters 1
NOTE:
Install the valve cotters by compressing the
valve spring with the valve spring compressor
2 and the valve spring compressor attachment
3 .
5-33
ENG
Recommended lubricant
Molybdenum disulfide oil
.
"
Valve spring compressor
90890-04019, YM-04019
Valve spring compressor
attachment
Intake valve
90890-04114, YM-4114
Exhaust valve
90890-04108, YM-4108