Yamaha 2004 YP400, Service Manual, Page: 242 / 417

5 - 29
ENG
VALVES AND VALVE SPRINGS
NOTE:
_
Install the valve spring with the larger pitch
a
facing up.
b
Smaller pitch
4. Install:
• valve cotters
1
NOTE:
_
Install the valve cotters by compressing the
valve spring with the valve spring compressor
2
and the valve spring compressor attach-
ment
3
.
Valve spring compressor
90890-04019, YM-04019
Valve spring compressor attach-
ment
90890-01243, YM-01253-1
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.
6. Install:
• valve pad
1
• valve lifter
2
NOTE:
_
• Lubricate the valve lifter and valve pad with
molybdenum disulfide oil.
• The valve lifter must move smoothly when
rotated with a finger.
• Each valve lifter and valve pad must be rein-
stalled in its original position.
1
2