Yamaha TMAX TECH MAX 2020 - Checking the Valve Lifters; Installing the Valves

5-28
VALVES AND VALVE SPRINGS
EAS30287
CHECKING THE VALVE LIFTERS
The following procedure applies to all of the
valve lifters.
1. Check:
• Valve lifter
Damage/scratches  Replace the valve lift-
ers and cylinder head.
EAS30288
INSTALLING THE VALVES
The following procedure applies to all of the
valves and related components.
1. Deburr:
• Valve stem end
(with an oil stone)
2. Lubricate:
• Valve stem
• Valve stem seal
(with the recommended lubricant)
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.
Recommended lubricant
Molybdenum disulfide oil
G088971
G088972
New
b. Smaller pitch
Valve spring compressor
90890-04019
Valve spring compressor
YM-04019
Valve spring compressor attach-
ment
90890-04114
Valve spring compressor adapter
19.5 mm
YM-04114
G088973
G088959