Removing The Valves - Yamaha YFM250RX 2008 Service Manual

VALVES AND VALVE SPRINGS

REMOVING THE VALVES

The following procedure applies to all of the
valves and related components.
NOTE: 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. Check:
• Valve sealing
Leakage at the valve seat → Check the
valve face, valve seat, and valve seat width.
Refer to "CHECKING THE VALVE SEATS".
a. Pour a clean solvent
exhaust ports.
b. Check that the valves properly seal.
NOTE: NOTE:
There should be no leakage at the valve seat
.
.
2. Remove:
• Valve cotters
NOTE: NOTE:
Remove the valve cotters by compressing the
valve spring with the valve spring compressor
and the valve spring compressor attachment
.
4-22
ENG
into the intake and
Valve spring compressor
90890-04019
YM-04019
Valve spring compressor
attachment
90890-01243
Valve spring compressor adapter
(26 mm)
YM-01253-1