Yamaha FX Nytro FX10MTRAX, Service Manual, Page: 456 / 859

5-37
ENG
VALVES AND VALVE SPRINGS
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)
NOTE:
• Make sure each valve is installed in its original
place.
• Install the valve spring with the larger pitch
a
fac-
ing up.
b
Smaller pitch
New
4. Install:
• Valve cotters
NOTE:
Install the valve cotters by compressing the valve
spring with the valve spring compressor
1
and
valve spring compressor attachment 2 .
Valve spring compressor:
90890-04019, YM-04019
Valve spring compressor attach-
ment:
90890-04114
Valve spring compressor adapter
19.5 mm:
YM-04114