Yamaha YZ125(W)/W1 Owner's Service Manual page 424

FRONT FORK
Base valve
1. Inspect:
9 Base valve 1
Wear/Damage¡Replace.
Contamination¡Clean.
9 O-ring 2
Wear/Damage¡Replace.
9 Piston metal 3
Wear/Damage¡Replace.
9 Spring 4
Damage/Fatigue¡Replace base valve.
9 Air bleed screw 5
Wear/Damage¡Replace.
Collar
1. Inspect:
9Piston metal 1
Wear/Damage ¡Replace.
EC554400
Fork spring
1. Measure:
9 Fork spring free length a
Out of specification¡Replace.
Fork spring free length:
Standard
454 mm
(17.9 in)
5-31
CHAS
<Limit>
449 mm
(17.7 in)