Removing The Valves; Checking The Valves And Valve Guides - Yamaha XVS250 2001 Service Manual

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 that the valves properly seal.
1. Check:
D 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 1 into the intake and
exhaust ports.
b. Check that the valves properly seal.
There should be no leakage at the valve seat
2 .
2. Remove:
D valve cotters
NOTE:
Remove the valve cotters by compressing the
valve spring with the valve spring compressor
1 .
EAS00239

CHECKING THE VALVES AND VALVE GUIDES

The following procedure applies to all of the
valve and valve guides.
1. Measure:
D valve-stem-to-valve-guide clearance
Valve-stem-to-valve-guide clearance =
Valve guide inside diameter a –
Valve stem diameter b
5-21
ENG
Valve spring compressor
90890-04019