Yamaha 2009 XP500Y TMAX Service Manual page 213

1. Deburr:
• Valve stem end
(with an oil stone)
2. Lubricate:
• Valve stem "1"
• Valve stem seal "2"
(with the recommended lubricant)
Recommended lubricant
Molybdenum disulfide oil
3. Install:
• Lower spring seat "1"
• Valve stem seal "2"
• Valve "3"
• Valve spring "4"
• Upper spring seat "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.
VALVES AND VALVE SPRINGS
b. Smaller pitch
4. Install:
• Valve cotters "1"
TIP
Install the valve cotters by compressing the
valve spring with the valve spring compressor
"2" and the valve spring compressor attachment
"3".
Valve spring compressor
90890-04019
YM-04019
Valve spring compressor attach-
ment
90890-04114
Valve spring compressor adapt-
er 19.5 mm
YM-04114
5-24