Yamaha YZ450F Owner's Service Manual page 357

Symptom
Jump
Heavy and
dragging
Poor road grip-
ping
Bottoming out
Bouncing
Stiff travel
Section
Medi-
Large Small
um
gap gap
gap
10-8
Check
Rebound Turn adjuster counterclock-
damping force wise (about 2 clicks) to de-
crease damping.
Spring Replace with soft spring.
Rebound Turn adjuster counterclock-
damping force wise (about 2 clicks) to de-
crease damping.
Low compres- Turn adjuster clockwise (about
sion damping 1 click) to increase damping.
High compres- Turn adjuster clockwise (about
sion damping 1/6 turn) to increase damping.
Spring set Set sunken length for 90–100
length mm (3.5–3.9 in) when one
passenger is astride seat.
Spring Replace with soft spring.
High compres- Turn adjuster clockwise (about
sion damping 1/6 turn) to increase damping.
Spring set Set sunken length for 90–100
length mm (3.5–3.9 in) when one
passenger is astride seat.
Spring Replace with stiff spring.
Rebound Turn adjuster clockwise (about
damping force 2 clicks) to increase damping.
Spring Replace with soft spring.
Turn adjuster counterclock-
High compres-
wise (about 1/6 turn) to de-
sion damping
crease damping.
Spring set Set sunken length for 90–100
length mm (3.5–3.9 in) when one
passenger is astride seat.
Spring Replace with soft spring.
CHASSIS
Adjust