Yamaha YZ426F(M)/LC Owner's Service Manual page 605

Rear shock absorber
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.
Adjust the rebound damping in 2-click increments or decrements.
Adjust the low compression damping in 1-click increments or decrements.
Adjust the high compression damping in 1/6 turn increments or decrements.
Symptom
Jump
Stiff, tending to sink
Spongy and unstable
Heavy and dragging
Poor road gripping
Bottoming out
Bouncing
Stiff travel
Section
Large Small
Medium
gap gap gap
Rebound damping
Spring set length
Rebound damping
Low compression damping
Spring
Rebound damping
Spring
Rebound damping
Low compression damping
High compression damp-
ing
Spring set length
Spring
High compression damp-
ing
Spring set length
Spring
Rebound damping
Spring
High compression damp-
ing
Spring set length
Spring
SETTING
Check
Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Set sunken length for 90 ~ 100 mm (3.5 ~ 3.9 in) when
one passenger is astride seat.
Turn adjuster clockwise (about 2 clicks) to increase
damping.
Turn adjuster clockwise (about 1 click) to increase
damping.
Replace with stiff spring.
Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Replace with soft spring.
Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Turn adjuster clockwise (about 1 clicks) to increase
damping.
Turn adjuster clockwise (about 1/6 clicks) to increase
damping.
Set sunken length for 90 ~ 100 mm (3.5 ~ 3.9 in) when
one passenger is astride seat.
Replace with soft spring.
Turn adjuster clockwise (about 1/6 turn) to increase
damping.
Set sunken length for 90 ~ 100 mm (3.5 ~ 3.9 in) when
one passenger in astride seat.
Replace with stiff spring.
Turn adjuster clockwise (about 2 clicks) to increase
damping.
Replace with soft spring.
Turn adjuster counterclockwise (about 1/6 turn) to
decrease damping.
Set sunken length for 95 ~ 100 mm (3.7 ~ 3.9 in) when
one passenger is astride seat.
Replace with soft spring.
7 - 21
T U N
Adjust