Checking The Valve Springs - Yamaha XF50W Service Manual

VALVES AND VALVE SPRINGS
EAS00241

CHECKING THE VALVE SPRINGS

The following procedure applies to all of the valve
springs.
1. Measure:
2. Measure:
b
3. Measure:
5-28
• valve spring free length a
Out of specification
spring.
Valve spring free length
Intake valve spring
39.35 mm (1.5492 in)
<Limit>: 37.38 mm (1.4717 in)
Exhaust valve spring
41.57 mm (1.6366 in)
<Limit>: 39.49 mm (1.5547 in)
• compressed valve spring force a
Out of specification
spring.
Installed length
Compressed valve spring force (in-
stalled)
Intake valve spring
9 1 . 1 ~ 1 0 4 . 9 N ( 9 . 3 ~ 1 0 . 7 k g ,
20.48~23.58lb) at 28mm(1.1024in)
Exhaust valve spring
1 0 7 . 9 ~ 1 2 4 . 1 N ( 1 1 . 0 ~ 1 2 . 7 k g ,
24.26~27.90lb) at 30mm(1.1811in)
• valve spring tilt a
Out of specification
spring.
Spring tilt limit
Intake valve spring
1.7 mm (0.0669 in) ( 2.5° )
Exhaust valve spring
1.8 mm (0.0709 in)( 2.5° )
-» Replace the valve
-» Replace the valve
-» Replace the valve