Base Valve Inspection; Collar Inspection; Fork Spring Inspection - Yamaha YZ450F(W) Owner's Service Manual

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FRONT FORK
Base valve
1. Inspect:
• Base valve 1
Wear/damage → Replace.
Contamination → Clean.
• O-ring 2
Wear/damage → Replace.
• Piston metal 3
Wear/damage → Replace.
• Spring 4
Damage/fatigue → Replace base valve.
• Air bleed screw 5
Wear/damage → Replace.
Collar
1. Inspect:
• Piston metal 1
Wear/damage → Replace.
EC554400
Fork spring
1. Measure:
• 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)

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This manual is also suitable for:

Yz450f 2007Yz450f w 2007Yz450f 2006Yz450fw 2006

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