Removing The Valves - Yamaha FZ1-N 2007 Service Manual

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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 5-25.
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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"
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VALVES AND VALVE SPRINGS
NOTE:
Remove 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
attachment
90890-04108
Valve spring compressor
adapter (22 mm)
YM-04108
Valve spring compressor
attachment
90890-04114
Valve spring compressor
adapter
YM-04114
4. Remove:
• Upper spring seat "1"
• Valve spring "2"
• Valve stem seal "3"
• Lower spring seat "4"
• Valve "5"
NOTE:
Identify the position of each part very carefully
so that it can be reinstalled in its original place.
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