Valves And Valve Springs; Removing The Valves - Yamaha FZ09E Service Manual

EA$2>12$)
REMOVING THE VALVES
The following procedure applies to all of the
valves and related components.
TIP ~~~~~~~~~~~~~~­
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"
• Va Ive pad "2"
TIP ~~~~~~~~~~~~~~­
Make a note of the position of each valve lifter
and valve pad so that they can be reinstalled in
their original place.
1 3
EX
IN
2
1
2. Check:
• Valve sealing
Leakage at the valve seat
--t
Check the valve
face, valve seat, and valve seat width.
Refer to "CHECKING
THE
VALVE SEATS"
on page 5-25.
••••••••••••••••••••••••••••••••
a. Pour a clean solvent "a" into the intake and
exhaust ports.
b. Check that the valves properly seal.
TIP ~~~~~~~~~~~~~~
There should be no leakage at the valve seat "1".
1
••••••••••••••••••••••••••••••••
3. Remove:
• Valve cotters
VALVES AND VALVE SPRINGS
TIP ~~~~~~~~~~~~~~
Remove the valve cotters by compressing the
valve spring with the valve spring compressor
"1" and the valve spring compressor attachment
''2".
Valve spring compressor
90890-04019
YM-04019
Valve spring compressor attach-
ment
90890-04108
Valve spring compressor adapter
22mm
YM-04108
1
4. Remove:
• Valve spring retainer "1"
• Valve spring "2"
• Valve "3"
• Valve stem seal "4"
• Valve spring seat "5"
TIP ~~~~~~~~~~~~~~­
ldentify the position of each part very carefully so
that it can be reinstalled in its original place.
·--._
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3
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CHECKING THE VALVES AND VALVE
GUIDES
The following procedure applies to all of the
valves and valve guides .
1. Measure:
• Valve-stem-to-valve-guide clearance
Out of specification
--t
Replace the valve
5-23