Yamaha MT-09 2021 - Page 262

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VALVES AND VALVE SPRINGS
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.
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”.
5. To secure the valve cotters onto the valve
stem, lightly tap the valve tip with a soft-face
hammer.
NOTICE
ECA13800
Hitting the valve tip with excessive force
could damage the valve.
6. Lubricate:
•Valve pad
(with the recommended lubricant)
• Valve lifter
(with the recommended lubricant)
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.
Recommended lubricant
Molybdenum disulfide oil
b. Smaller pitch
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
G088973
Recommended lubricant
Molybdenum disulfide oil
Recommended lubricant
Engine oil
G088959
G088975