Yamaha WR450FB 2012, Owner'S Service Manual

Page: 183 / 392

FRONT FORK
5-49
3. Measure:
• Fork spring free length “a”
Out of specification
o
Replace.
4. Check:
• Damper assembly “1”
Bend/damage
o
Replace.
• O-ring “2”
Wear/damage
o
Replace.
ECA1DX1010
NOTICE
• The front fork leg has a built-in damper ad-
justing rod and a very sophisticated inter-
nal construction, which are particularly
sensitive to foreign material.
• When disassembling and assembling the
front fork leg, do not allow any foreign ma-
terial to enter the front fork.
5. Check:
• Base valve “1”
Wear/damage
o
Replace.
Contamination
o
Clean.
• O-ring “2”
Wear/damage
o
Replace.
• Base valve bushing “3”
Wear/damage
o
Replace.
• Spring “4”
Damage/fatigue
o
Replace base valve.
• Air bleed screw “5”
Wear/damage
o
Replace.
6. Check:
• Contacting surface “a”
Wear/damage
o
Replace.
7. Check:
• Adjuster “1”
• O-ring “2”
Wear/damage
o
Replace.
EAS23020
ASSEMBLING THE FRONT FORK LEGS
The following procedure applies to both of the
front fork legs.
EWA13660
WARNING
• Make sure the oil levels in both front fork
legs are equal.
• Uneven oil levels can result in poor han-
dling and a loss of stability.
Fork spring free length
454.0 mm (17.87 in)
Limit
449.0 mm (17.68 in)
2
1
New
1
3
4
5
2
a
New
1
2