Yamaha 2006 YZFR6V, Service Manual

Page: 230 / 444

VALVES AND VALVE SPRINGS
5-19
EAS24280
REMOVING THE VALVES
The following procedure applies to all of the
valves and related components.
NOTE:
Before removing the internal parts of the cylinder
head (e.g., valves, valve springs, valve seats),
make sure the valves properly seal.
1. Remove:
• Valve lifter “1”
• Valve pad “2”
NOTE:
Make a note of the position of each valve lifter
and valve pad so that they can be reinstalled in
their original place.
2. Check:
• Valve sealing
Leakage at the valve seat
→
Check the valve
face, valve seat, and valve seat width.
Refer to “CHECKING THE VALVE SEATS”
on page 5-21.
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a. Pour a clean solvent “a” into the intake and
exhaust ports.
b. Check that the valves properly seal.
NOTE:
There should be no leakage at the valve seat “1”.
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3. Remove:
• Valve cotters “1”
NOTE:
Remove the valve cotters by compressing the
valve spring with the valve spring compressor
“1” and the valve spring compressor attachment
“2”.
4. Remove:
• Upper spring seat “1”
• Valve spring “2”
• Valve “3”
• Valve stem seal “4”
• Lower spring seat “5”
NOTE:
Identify the position of each part very carefully so
that it can be reinstalled in its original place.
EAS24290
CHECKING THE VALVES AND VALVE
GUIDES
The following procedure applies to all of the
valves and valve guides.
Valve spring compressor
90890-04019
YM-04019
Valve spring compressor attach-
ment
90890-04108
Valve spring compressor adapt-
er 22 mm
YM-04108