Valves And Valve Springs; Removing The Valves; Checking The Valves And Valve Guides - Yamaha YZFR6X(C) 2008 Service Manual

EAS24280

REMOVING THE VALVES

The following procedure applies to all of the
valves and related components.
NOTE:
Before removing the internal parts of the cylin-
der 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:

VALVES AND VALVE SPRINGS

• Valve cotters "1"
NOTE:
Remove the valve cotters by compressing the
valve spring with the valve spring compressor
"1" and the valve spring compressor attach-
ment "2".
Valve spring compressor
90890-04019
YM-04019
Valve spring compressor
attachment
90890-04108
Valve spring compressor
adapter 22 mm
YM-04108
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.
1. Measure:
5-19