Removing The Valves And Valve Springs - Yamaha YFZ450S 2003 Service Manual

VALVES AND VALVE SPRINGS
EBS00238
REMOVING THE VALVES AND VALVE
SPRINGS
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:
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:
M
a. Pour a clean solvent a into the intake and
b. Check that the valve seals properly.
L
3. Remove:
NOTE:
_
Attach a valve spring compressor 1 and
attachment 2 between the valve spring
retainer and the cylinder head to remove the
valve cotters.
4 - 26
• valve lifter 1
• valve pad 2
• valve sealing
Leakage at the valve seat → Check the
valve face, valve seat and valve seat width.
Refer to "CHECKING THE VALVES AND
VALVE SPRINGS".
MMM M MMM M M MMM M M MMM
exhaust ports.
There should be no leakage at the valve
seat 1.
LLL L LLL L L LLL L L LLL
• valve cotters
ENG
M M MMM M M MMM M
L L LLL L L LLL L
MMM
LLL