Checking The Valve Lifters; Installing The Valves - Yamaha TMAX 2020 Service Manual

G088971
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)
G088972
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)
New
VALVES AND VALVE SPRINGS
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
90890-04019
Valve spring compressor
YM-04019
Valve spring compressor attach-
ment
90890-04114
Valve spring compressor adapter
19.5 mm
YM-04114
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.
5-28