Yamaha YZ450F Manuel D'atelier Du Proprietaire page 638

EC72H002
Suspension setting
• Front fork
NOTE:
• If any of the following symptoms is experienced with the standard position as the base, make
resetting by reference to the adjustment procedure given in the same chart.
• Before any change, set the rear shock absorber sunken length to the standard figure 90 ~ 100 mm
(3.5 ~ 3.9 in).
Symptom
Jump
Stiff over entire range
Unsmooth movement
over entire range
Poor initial
movement
Soft over entire
range, bottoming out
Stiff toward stroke
end
Soft toward stroke
end, bottoming out
Stiff initial movement
Low front, tending to
lower front posture
"Obtrusive" front,
tending to upper front
posture
Section
Large Medium Small
gap gap gap
Compression damping
Oil amount
Spring
Outer tube
Inner tube
Slide metal
Piston metal
Under bracket tightening
torque
Rebound damping
Oil seal
Compression damping
Oil amount
Spring
Oil amount
Oil amount
Compression damping
Compression damping
Rebound damping
Balance with rear end
Oil amount
Compression damping
Balance with rear end
Spring
Oil amount
SETTING
Check
Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Decrease oil amount by about 5 ~ 10 cm
0.4 Imp oz, 0.2 ~ 0.3 US oz).
Replace with soft spring.
Check for any bends, dents, and other noticeable
scars, etc. If any, replace affected parts.
Replace with a new one for extended use.
Replace with a new one for extended use.
Retighten to specified torque.
Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Apply grease in oil seal wall.
Turn adjuster clockwise (about 2 clicks) to increase
damping.
Increase oil amount by about 5 ~ 10 cm
0.4 Imp oz, 0.2 ~ 0.3 US oz).
Replace with stiff spring.
Decrease oil amount by about 5 cm
0.2 US oz).
Increase oil amount by about 5 cm
0.2 US oz).
Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Turn adjuster clockwise (about 2 clicks) to increase
damping.
Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Set sunken length for 95 ~ 100 mm (3.7 ~ 3.9 in) when
one passenger is astride seat (lower rear posture).
Increase oil amount by about 5 cm
0.2 US oz).
Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Set sunken length for 90 ~ 95 mm (3.5 ~ 3.7 in)
when one passenger is astride seat (upper rear pos-
ture).
Replace with soft spring.
Decrease oil amount by about 5 ~ 10 cm
0.4 Imp oz, 0.2 ~ 0.3 US oz).
7 - 20
T U N
Adjust
3
(0.2 ~
3
(0.2 ~
3
(0.2 Imp oz,
3
(0.2 Imp oz,
3
(0.2 Imp oz,
3
(0.2 ~