Yamaha RS90K, Service Manual

Page: 488 / 841

5-35
ENG
VALVES AND VALVE SPRINGS
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
4. Install:
• Valve cotters
1
NOTE:
Install the valve cotters by compressing the valve
spring with the valve spring compressor set
2 and
attachment
3
.
Valve spring compressor set:
90890-04019, YM-04019
Attachment:
90890-04108, YM-04108
2
3
1
5. To secure the valve cotters onto the valve stem,
lightly tap the valve tip with a soft-face hammer.
CAUTION:
Hitting the valve tip with excessive force could
damage the valve.