Yamaha XSR 900 2022 Service Manual page 253

2. Lubricate:
• Valve stem
• Valve stem seal
(with the recommended lubricant)
Recommended lubricant
Molybdenum disulfide oil
3. Install:
• Valve spring seat "1"
• Valve stem seal "2"
• Valve "3"
• Valve spring "4"
• Valve spring retainer "5"
(into the cylinder head)
TIP
• Make sure each valve is installed in its original
place.
• Install the valve springs with the larger pitch "a"
facing up.
G088973
b. Smaller pitch
4. Install:
• Valve cotter
TIP
Install the valve cotters by compressing the
valve spring with the valve spring compressor
"1" and the valve spring compressor attachment
"2".
Valve spring compressor
90890-04200
Valve spring compressor
YM-04019
Valve spring compressor attach-
ment (ø23)
90890-04179
Valve spring compressor adapter
(ø23)
YM-04179
New
VALVES AND VALVE SPRINGS
G088959
5. To secure the valve cotters onto the valve
stem, lightly tap the valve tip with a soft-face
hammer.
ECA13800
NOTICE
Hitting the valve tip with excessive force
could damage the valve.
G088975
6. Lubricate:
• Valve pad
(with the recommended lubricant)
Recommended lubricant
Molybdenum disulfide oil
• Valve lifter
(with the recommended lubricant)
Recommended lubricant
Engine oil
7. Install:
• Valve pad
• Valve lifter
TIP
• The valve lifter must move smoothly when ro-
tated with a finger.
• Each valve lifter and valve pad must be rein-
stalled in its original position.
5-36