Checking The Swingarm Operation; Lubricating The Swingarm Pivot; Checking The Connecting Arm And Relay Arm; Checking The Tires - Yamaha YZ450F 2020 Owner's Service Manual

Direction "a"
Compression damping is increased
(suspension is harder).
Direction "b"
Compression damping is decreased
(suspension is softer).
Slow compression damping
Minimum (soft)
20 click(s) in direction "b"*
Standard
9 click(s) in direction "b"*
Maximum (hard)
0 click(s) in direction "b"*
* With the adjusting screw fully turned in di-
rection "a"
TIP
Although the total number of clicks of a damping
force adjusting mechanism may not exactly
match the above specifications due to small dif-
ferences in production, the actual number of
clicks always represents the entire adjusting
range. To obtain a precise adjustment, it would
be advisable to check the number of clicks of
each damping force adjusting mechanism and
to modify the specifications as necessary.
1 1
EAM30240

CHECKING THE SWINGARM OPERATION

1. Check:
• Swingarm smooth action
• Swingarm free play
Refer to "SWINGARM" on page 4-65.
EAM30500

LUBRICATING THE SWINGARM PIVOT

1. Lubricate:
• Oil seals
• Collars
Recommended lubricant
Lithium-soap-based grease
Refer to "INSTALLING THE SWINGARM" on
b b
a a
page 4-66.
EAM30501
CHECKING THE CONNECTING ARM AND
RELAY ARM
Refer to "CHECKING THE CONNECTING ARM
AND RELAY ARM" on page 4-63.
EAM30243

CHECKING THE TIRES

1. Measure:
• Tire pressure
Out of specification  Regulate.
Tire air pressure (measured on
cold tires)
Front
100 kPa (1.00 kgf/cm², 15 psi)
Rear
100 kPa (1.00 kgf/cm², 15 psi)
TIP
• Check the tire while it is cold.
• Loose bead stoppers allow the tire to slip off its
position on the rim when the tire pressure is
low.
• If the tire valve stem is found tilted, the tire is
considered to be slipping off its position. Cor-
rect the tire position.
EAM30244

CHECKING AND TIGHTENING THE SPOKES

1. Check:
• Spoke
Bend/damage  Replace.
Loose  Tighten.
3-32
CHASSIS