Yamaha YZ250 Owner's Service Manual page 430

FRONT FORK
Base valve
1. Inspect:
9 Base valve 1
Wear/Damage¡Replace.
Contamination¡Clean.
9 O-ring 2
Wear/Damage¡Replace.
9 Bush 3
Wear/Damage¡Replace base valve.
9 Spring 4
Damage/Fatigue¡Replace base valve.
9 Air bleed screw 5
Wear/Damage¡Replace base valve.
EC554400
Fork spring
1. Measure:
9 Fork spring free length a
Out of specification¡Replace.
Fork spring free length:
Standard
465 mm
(18.3 in)
EC554502
Inner tube
1. Inspect:
9 Inner tube surface a
Score marks¡Repair or replace.
Use #1,000 grit wet sandpaper.
Damaged oil lock piece¡Replace.
9 Inner tube bends
Out of specification¡Replace.
Use the dial gauge 1.
Inner tube bending limit:
0.2 mm (0.008 in)
NOTE:
The bending value is shown by one half of the
dial gauge reading.
w
Do not attempt to straighten a bent inner
tube as this may dangerously weaken the
tube.
5-31
CHAS
<Limit>
460 mm
(18.1 in)