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Yamaha YZ426F Manual

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TUN
SETTING
EC72H002
Suspension setting
● Front fork
N
OTE:
● 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
Section
Check Adjust
Jump
Large
gap
Medium
gap
Small
gap
Stiff over entire range
⅙⅙⅙
Compression damping
Oil level (oil amount)
Spring
Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Decrease oil level by about 5 ~ 10 mm (0.2 ~ 0.4 in).
Replace with soft spring.
Unsmooth movement
over entire range
⅙⅙⅙⅙
Outer tube
Inner tube
Under bracket tightening
torque
Check for any bends, dents, and other noticeable
scars, etc. If any, replace affected parts.
Retighten to specified torque.
Poor initial
movement
⅙
Rebound damping
Oil seal
Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Apply grease in oil seal wall.
Soft over entire range,
bottoming out
⅙⅙
Compression damping
Oil level (oil amount)
Spring
Turn adjuster clockwise (about 2 clicks) to increase
damping.
Increase oil level by about 5 ~ 10 mm (0.2 ~ 0.4 in).
Replace with stiff spring.
Stiff toward stroke end
⅙
Oil level (oil amount) Decrease oil level by about 5 mm (0.2 in).
Soft toward stroke end,
bottoming out
⅙
Oil level (oil amount) Increase oil level by about 5 mm (0.2 in).
Stiff initial movement
⅙⅙⅙⅙
Compression damping
Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Low front, tending to
lower front posture
⅙⅙
Compression damping
Rebound damping
Balance with rear end
Oil level (oil amount)
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 level by about 5 mm (0.2 in).
“Obtrusive” front, tend-
ing to upper front pos-
ture
⅙⅙
Compression damping
Balance with rear end
Spring
Oil lever (oil amount)
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 posture).
Replace with soft spring.
Decrease oil level by about 5 ~ 10 mm (0.2 ~ 0.4 in).
… 626 …


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