2009 YAMAHA YFZ450R Owners Manual

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TIP

Make sure that the seat is securely fitted.
EBU29301
Adjusting the front shock absorber
assemblies
These shock absorber assemblies are equipped
with a spring preload adjusting nut, a rebound
damping force adjusting screw, with a compres-
sion damping force adjusting bolt (for fast com-
pression damping), and a compression damping
force adjusting screw (for slow compression damp-ing).
WARNING

EWB00410
These shock absorber assemblies contain
highly pressurized nitrogen gas. Read and un-
derstand the following information before han-
dling the shock absorber assemblies.

Do not tamper with or attempt to open the
cylinder assemblies.

Do not subject the shock absorber assem-
blies to an open flame or other high heat
source. This may cause the unit to explode
due to excessive gas pressure.

Do not deform or damage the cylinders in
any way. Cylinder damage will result in poor
damping performance.

Do not dispose of a damaged or worn out
shock absorber assembly yourself. Take the
shock absorber assembly to a Yamaha deal-
er for any service.
Spring preload
1. Loosen the locknut.
2. Turn the adjusting nut in direction (a) to in-
crease the spring preload and thereby harden
the suspension, and in direction (b) to de-
1. Projection
2. Seat holder
1
2

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crease the spring preload and thereby soften
the suspension.
TIP


A special wrench can be obtained at a Yamaha
dealer to make this adjustment.

The spring preload setting is determined by
measuring distance A, shown in the illustration.
The shorter distance A is, the higher the spring
preload; the longer distance A is, the lower the
spring preload. With each complete turn of the
adjusting nut, distance A is changed by 1.5 mm
(0.06 in).
1. Spring preload adjusting nut
2. Locknut
3. Special wrench
(a)
(b)1 2
3

Spring preload setting:
Minimum (soft):
Distance A = 299.8 mm (11.80 in)
Standard:
Distance A = 289.8 mm (11.41 in)
Maximum (hard):
Distance A = 279.8 mm (11.02 in)
1. Distance A
1

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3. Tighten the locknut to the specified torque.
NOTICE

ECB00080
Always tighten the locknut against the adjust-
ing nut, and then tighten it to the specified
torque.
Rebound damping force
Turn the adjusting screw in direction (a) to increase
the rebound damping force and thereby harden
the damping, and in direction (b) to decrease the
rebound damping force and thereby soften the
damping.Tightening torque:
Locknut:
50 Nm (5.0 m·kgf, 36 ft·lbf)
1. Rebound damping force adjusting screw
Rebound damping setting:
Minimum (soft):
20 click(s) in direction (b)*
Standard:
12 click(s) in direction (b)*
Maximum (hard):
1 click(s) in direction (b)*
* With the adjusting screw fully turned in di-
rection (a)
1
(a)
(b)

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Compression damping force
Compression damping force (for fast compression
damping)To increase the compression damping force and
thereby harden the compression damping, turn the
adjusting bolt in direction (a). To decrease the
compression damping force and thereby soften
the compression damping, turn the adjusting bolt
in direction (b).
TIP
Make sure that the position indicator marks are
aligned when the shock absorber assembly is set
to the standard setting.
Compression damping force (for slow compres-sion damping)To increase the compression damping force and
thereby harden the compression damping, turn the
adjusting screw in direction (a). To decrease the
compression damping force and thereby soften
the compression damping, turn the adjusting
screw in direction (b).
1. Compression damping force adjusting bolt (for fast com-
pression damping)
2. Position indicator marks
(a)
(b)
1
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Compression damping setting (for fast com-
pression damping):
Minimum (soft):
2 turn(s) out from the fully turned in position
Standard:
1 turn(s) out from the fully turned in position
Maximum (hard):
Fully turned in

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NOTICE

ECB00090
Never turn an adjusting mechanism beyond
the minimum and maximum settings.
TIP
Although the total number of clicks of a damping
force adjusting mechanism may not exactly match
the above specifications due to small differences in
production, the actual number of clicks always rep-
resents the entire adjusting range. To obtain a pre-
cise adjustment, it would be advisable to check the
number of clicks of each damping force adjusting
mechanism and to modify the specifications as
necessary.
WARNING

EWB02490

Suspension components become hot during
operation. Never touch the compression
damping force adjusting bolt and screw, the
rebound damping force adjusting screw or
the oil reservoir with your bare hand or skin
until suspension components have cooled.

Always adjust the shock absorber assem-
blies on the left and right side to the same
setting.
1. Compression damping force adjusting screw (for slow
compression damping)
Compression damping setting (for slow com-
pression damping):
Minimum (soft):
18 click(s) in direction (b)*
Standard:
10 click(s) in direction (b)*
Maximum (hard):
1 click(s) in direction (b)*
* With the adjusting screw fully turned in di-
rection (a)
(a)
(b)
1

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Uneven adjustment can cause poor handling
and loss of stability, which could lead to an
accident.
EBU29522
Adjusting the rear shock absorber
assembly
This shock absorber assembly is equipped with a
spring preload adjusting nut, a rebound damping
force adjusting screw, with a compression damp-
ing force adjusting bolt (for fast compression
damping), and a compression damping force ad-
justing screw (for slow compression damping).
WARNING

EWB00430
This shock absorber assembly contains highly
pressurized nitrogen gas. Read and under-
stand the following information before han-
dling the shock absorber assembly.

Do not tamper with or attempt to open the
cylinder assembly.

Do not subject the shock absorber assembly
to an open flame or other high heat source.
This may cause the unit to explode due to ex-
cessive gas pressure.

Do not deform or damage the cylinder in anyway. Cylinder damage will result in poor
damping performance.

Do not dispose of a damaged or worn out
shock absorber assembly yourself. Take the
shock absorber assembly to a Yamaha deal-
er for any service.
Spring preload
1. Remove panel C. (See page 8-8.)
2. Loosen the clamp screw at the throttle body
side, and then disconnect the air intake duct
from the throttle body.
3. Disconnect the coupler.
1. Clamp screw
1

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4. Loosen the clamp screw at the air filter case
side, and then disconnect the air intake duct
from the air filter case.5. Remove the air filter case holding plate by re-
moving the bolts and collars.
1. Coupler
1

1. Clamp screw
1

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6. Remove the blow-by gas chamber by remov-
ing the bolt.7. Remove the air filter case by removing the
bolts.
1. Bolt
2. Collar
3. Air filter case holding plate
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1. Blow-by gas chamber
2. Bolt
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