Removing The Valves - Yamaha YP400T Service Manual

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VALVES AND VALVE SPRINGS
EAS00237

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".
M MMM
a. Pour a clean solvent a into the intake and
exhaust ports.
a
b. Check that the valves properly seal.
NOTE:
_
There should be no leakage at the valve seat
1.
L LLL
3. Remove:
• valve cotters 1
NOTE:
_
Remove the valve cotters by compressing the
valve spring with the valve spring compressor
2 and the valve spring compressor attach-
ment 3.
5 - 22
ENG
M MMM M M MMM M M MMM M M MMM
L LLL L L LLL L L LLL L L LLL
Valve spring compressor
90890-04019, YM-04019
Valve spring compressor attach-
ment
90890-01243, YM-01253-1
M M MMM M MMM
L L LLL L LLL