Yamaha YZ450F User Manual

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

Yamaha YZ450F Specifications

General

Displacement	449cc
Bore x Stroke	97.0 mm x 60.8 mm
Transmission	5-speed
Final Drive	Chain
Width	32.5 in
Seat Height	38.2 in
Wheelbase	58.5 in
Fuel Capacity	1.6 gal
Fuel System	Fuel Injection
Front Suspension	KYB® Speed-Sensitive System inverted fork; fully adjustable, 12.2-in travel
Front Brakes	Hydraulic single disc, 270mm
Rear Brakes	Hydraulic single disc
Front Tire	80/100-21
Rear Tire	120/80-19
Wet Weight	245 lbs
Engine Type	Liquid-cooled, 4-stroke, DOHC, 4-valve