Checking The Valve Springs; Installing The Valves - Yamaha XVS250 2001 Service Manual

VALVES AND VALVE SPRINGS
EAS00241

CHECKING THE VALVE SPRINGS

The following procedure applies to all of the
valve springs.
1. Measure:
D valve spring free length a
Out of specification  Replace the valve
spring.
2. Measure:
D compressed spring force a
Out of specification  Replace the valve
spring.
b Installed length
3. Measure:
D valve spring tilt c
Out of specification  Replace the valve
spring.
EAS00245

INSTALLING THE VALVES

The following procedure applies to all of the
valves and related components.
1. Deburr:
D valve stem end
(with an oil stone)
2. Lubricate:
D valve stem
D oil seal
(with the recommended lubricant)
3. Install:
D valve
D lower spring seat
D oil seal
D valve spring
D upper spring seat
(into the cylinder head)
5-25
ENG
Valve spring free length (intake
and exhaust)
29.75 mm,
<Limit>: 28.75 mm
Compressed spring force
Intake and exhaust spring
71.7 79.3 N at 25.7 mm
Spring tilt limit
Intake and exhaust valve spring
2.5_/1.7 mm
New
Recommended lubricant
Molybdenum disulfide oil
New