Yamaha YZ450F(E) 2014, Owner'S Service Manual

Page: 353 / 360

CHASSIS
10-6
EAS1SL1377
SUSPENSION SETTING (FRONT FORK)
TIP
• If any of the following symptoms is experienced with the standard position as the base, make reset-
ting 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
Section
Check Adjust
Jump Large
gap
Medi-
um
gap
Small
gap
Stiff over entire
range
Compression
damping force
Turn adjuster counterclock-
wise (about 2 clicks) to de-
crease damping.
Oil amount Decrease oil amount by about
5–10 cm
3
(0.2–0.3 US oz, 0.2–
0.4 Imp.oz).
Spring Replace with soft spring.
Unsmooth
movement over
entire range
Outer tube
Inner tube
Check for any bends, dents,
other noticeable scars, etc. If
any, replace affected parts.
Slide metal Replace with a new one for ex-
tended use.
Piston metal Replace with a new one for ex-
tended use.
Lower bracket
tightening
torque
Retighten to specified torque.
Poor initial
movement
Rebound
damping force
Turn adjuster counterclock-
wise (about 2 clicks) to de-
crease damping.
Oil seals Apply grease in oil seal wall.
Soft over entire
range, bottom-
ing out
Compression
damping force
Turn adjuster clockwise (about
2 clicks) to increase damping.
Oil amount Increase oil amount by about
5–10 cm
3
(0.2–0.3 US oz, 0.2–
0.4 Imp.oz).
Spring Replace with stiff spring.
Stiff toward
stroke end
Oil amount
Decrease oil amount by about
5 cm
3
(0.2 US oz, 0.2 Imp.oz).
Soft toward
stroke end, bot-
toming out
Oil amount
Increase oil amount by about 5
cm
3
(0.2 US oz, 0.2 Imp.oz).
Stiff initial
movement
Compression
damping force
Turn adjuster counterclock-
wise (about 2 clicks) to de-
crease damping.