Removal - Yamaha RS90GTZ Service Manual

VALVES AND VALVE SPRINGS

REMOVAL

The following procedure applies to all of the
valves and related components.
TIP
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
• Valve pad
TIP
Make a note of the position of each valve lifter
and valve pad so that they can be reinstalled in
their original place.
2. Inspect:
• Valve sealing
Leakage at the valve seat → Check the
valve face, valve seat, and valve seat width.
Inspection steps:
• Pour a clean solvent
exhaust ports.
• Check that the valves properly seal.
TIP
There should be no leakage at the valve seat
.
5-33
ENG
into the intake and