YAMAHA YZ450F 2013 Owners Manual

5-22
FRONT FORK
25. Install:
• Damper assembly "1"
To inner tube "2".
To install the damper assembly
into the inner tube, hold the inner
tube aslant. If the inner tube is held
vertically, the damper assembly
may fall into it, damaging the valve
inside.
26. Loosen:
• Rebound damping adjuster "1"
• Loosen the rebound damping ad-
juster finger tight.
• Record the set position of the ad-
juster (the amount of turning out the
fully turned in position).
27. Install:
• Push rod "1"
• Copper washer "2"
• Adjuster "3"
To damper assembly "4".
• While compressing the inner tube
"5", set the cap bolt ring wrench "7"
between the inner tube and locknut
"6".
• Fully finger tighten the adjuster onto
the damper assembly.
28. Inspect:
• Gap "a" between the adjuster "1"
and locknut "2".
Out of specification → Retighten
and readjust the locknut.
If the adjuster is installed out of spec-
ification, proper damping force can-
not be obtained.
29. Tighten:
• Adjuster (locknut) "1"
Hold the locknut "2" and tighten the
adjuster with specified torque.
30. Install:
• Adjuster "1"
To inner tube.31. Fill:
• Front fork oil "1"
From outer tube top.
Never fail to make the oil amount
adjustment between the maximum
and minimum amount and always
adjust each front fork to the same
setting. Uneven adjustment can
cause poor handling and loss of
stability.
• Be sure to use recommended
fork oil. If other oils are used,
they may have an excessively ad-
verse effect on the front fork per-
formance.
• Never allow foreign materials to
enter the front fork.
32. Install:
• Damper assembly "1"
To outer tube.
Temporarily tighten the damper as-
sembly.
Cap bolt ring wrench:
YM-01501/90890-01501
Gap "a" between the ad-
juster and locknut:
0.5–1.0 mm (0.02–0.04
in)
Adjuster (locknut):
29 Nm (2.9 m•kg, 21
ft•lb)
Adjuster:
55 Nm (5.5 m•kg, 40
ft•lb)
Recommended oil:
Suspension oil "S1"
Standard oil amount:
355 cm
3 (12.5 Imp oz,
12.0 US oz)
Extent of adjustment:
300–365 cm
3
(10.6–12.8 Imp
oz,10.1–12.3 US oz)

5-23
FRONT FORK
33. Install:
• Protector guide "1"
INSTALLING THE FRONT FORK
1. Install:
• Front fork "1"
• Temporarily tighten the pinch bolts
(lower bracket).
• Do not tighten the pinch bolts (up-
per bracket) yet.
2. Tighten:
• Damper assembly "1"
Use the cap bolt ring wrench "2" to
tighten the damper assembly with
specified torque.
3. Adjust:
• Front fork top end "a"4. Tighten:
• Pinch bolt (upper bracket) "1"
• Pinch bolt (lower bracket) "2"
Tighten the lower bracket to speci-
fied torque. If torqued too much, it
may cause the front fork to mal-
function.
5. Install:
• Protector "1"
• Bolt (protector) "2"
6. Adjust:
• Rebound damping force
Turn in the damping adjuster "1" fin-
ger-tight and then turn out to the orig-
inally set position.
7. Adjust:
• Compression damping force
Turn in the damping adjuster "1" fin-
ger-tight and then turn out to the orig-
inally set position.
Damper assembly:
30 Nm (3.0 m•kg, 22
ft•lb)
Cap bolt ring wrench:
YM-01501/90890-01501
Front fork top end (stan-
dard) "a":
0 mm (0 in)
Pinch bolt (upper brack-
et):
21 Nm (2.1 m•kg, 15
ft•lb)
Pinch bolt (lower brack-
et):
21 Nm (2.1 m•kg, 15
ft•lb)
Bolt (protector):
5 Nm (0.5 m•kg, 3.6
ft•lb)

5-24
HANDLEBAR
HANDLEBAR
REMOVING THE HANDLEBAR
Order Part name Q'ty Remarks
Number plate Remove the band only.
1 Clutch cable 1 Disconnect at the lever side.
2 Clutch lever holder 1
3 Engine stop switch 1
4 Brake master cylinder 1 Refer to removal section.
5 Throttle cable cap 1
6 Throttle cable #1 (pulled) 1 Disconnect at the throttle side.
7 Throttle cable #2 (pushed) 1 Disconnect at the throttle side.
8 Right grip 1 Refer to removal section.
9 Tube guide 1
10 Collar 1
11 Left grip 1 Refer to removal section.
12 Handlebar upper holder 2
13 Handlebar 1
14 Handlebar lower holder 2
15 Cap 1

5-25
HANDLEBAR
REMOVING THE BRAKE MASTER
CYLINDER
1. Remove:
• Brake master cylinder bracket "1"
• Brake master cylinder "2"
• Do not let the brake master cylin-
der hang on the brake hose.
• Keep the brake master cylinder
cap side horizontal to prevent air
from coming in.
REMOVING THE GRIP
1. Remove:
•Grip "1"
Blow in air between the handlebar or
tube guide and the grip. Then remove
the grip which has become loose.
CHECKING THE HANDLEBAR
1. Inspect:
• Handlebar "1"
Bends/cracks/damage→Re-
place.
Do not attempt to straighten a bent
handlebar as this may dangerous-
ly weaken the handlebar.
INSTALLING THE HANDLEBAR
1. Install:
• Handlebar lower holder "1"
• Washer "2"
• Nut (handlebar lower holder) "3"
• Be sure the side of the handlebar
lower holder having the greater dis-
tance "a" from the mounting bolt
center faces forward. And install it
in the hole "b" in the rear of the up-
per bracket.
• Apply the lithium soap base grease
on the thread of the handlebar low-
er holder.
• Change in the direction back to
front and installing position of the
handlebar lower holder allows the
front-to-rear offset amount of the
handlebar position to be changed.
• Do not tighten the nut yet.
A. Forward
2. Install:
• Handlebar "1"
• Handlebar upper holder "2"
• Bolt (handlebar upper holder) "3"
• The handlebar upper holder should
be installed with the punched mark
"a" forward.
• Install the handlebar so that the
marks "b" are in place on both
sides.
• Install the handlebar so that the pro-
jection "c" of the handlebar upper
holder is positioned at the mark on
the handlebar as shown.
• First tighten the bolts on the front
side of the handlebar upper holder,
and then tighten the bolts on the
rear side.
Bolt (handlebar upper
holder):
28 Nm (2.8 m•kg, 20
ft•lb)

5-26
HANDLEBAR
3. Tighten:
• Nut (handlebar lower holder) "1"
•Cap "2"
Install the cap "2" onto the handlebar
lower holder nut (left).
4. Install:
• Left grip "1"
Apply the adhesive to the handle-
bar "2".
• Before applying the adhesive, wipe
off grease or oil on the handlebar
surface "a" with a lacquer thinner.
• Install the left grip to the handlebar
so that the line "b" between the two
arrow marks faces straight upward.
5. Install:
• Right grip "1"
•Collar "2"
Apply the adhesive on the tube
guide "3".
• Before applying the adhesive, wipe
off grease or oil on the tube guide
surface "a" with a lacquer thinner.
• Install the grip to the tube guide so
that the grip match mark "b" and
tube guide slot "c" form the angle as
shown.
6. Install:
• Collar "1"
• Grip cap cover "2"
• Throttle grip "3"
Apply the lithium soap base grease
on the throttle grip sliding surface.
7. Install:
• Throttle cables "1"
To tube guide "2".
Apply the lithium soap base grease
on the throttle cable end and tube
guide cable winding portion.
8. Install:
• Throttle cable cap "1"
• Screw (throttle cable cap) "2"
After tightening the screws, check
that the throttle grip "3" moves
smoothly. If it does not, retighten
the bolts for adjustment.
9. Install:
• Grip cap cover "1"
• Cover (throttle cable cap) "2"
10. Install:
• Brake master cylinder "1"
• Brake master cylinder bracket "2"
• Bolt (brake master cylinder brack-
et) "3"
• Install the bracket so that the arrow
mark "a" faces upward.
• First tighten the bolt on the upper
side of the brake master cylinder
bracket, and then tighten the bolt on
the lower side.
Nut (handlebar lower
holder):
34 Nm (3.4 m•kg, 24
ft•lb)
Screw (throttle cable
cap):
4 Nm (0.4 m•kg, 2.9
ft•lb)
Bolt (brake master cylin-
der bracket):
9 Nm (0.9 m•kg, 6.5
ft•lb)

5-27
HANDLEBAR
11. Install:
• Engine stop switch "1"
• Clutch lever holder "2"
• Bolt (clutch lever holder) "3"
•Clamp "4"
• The engine stop switch, clutch lever
holder and clamp should be in-
stalled according to the dimensions
shown.
• Pass the engine stop switch lead in
the middle of the clutch lever hold-
er.
12. Install:
• Clutch cable "1"
Apply the lithium soap base grease
on the clutch cable end.
13. Adjust:
• Clutch lever free play
Refer to "ADJUSTING THE
CLUTCH LEVER FREE PLAY"
section in the CHAPTER 3.Bolt (clutch lever holder):
5 Nm (0.5 m•kg, 3.6
ft•lb)
0 mm
0 mm

5-28
STEERING
STEERING
REMOVING THE STEERING
Order Part name Q'ty Remarks
TIGHTENING STEPS:
• Tighten ring nut. 38 Nm (3.8 m•kg, 27 ft•lb)
• Loosen it one turn.
• Retighten it. 7 Nm (0.7 m•kg, 5.1 ft•lb)
Hold the machine by placing the suitable stand
under the engine.Refer to "HANDLING NOTE".
Number plateRefer to "SEAT AND SIDE COVERS" section
in the CHAPTER 4.
Handlebar Refer to "HANDLEBAR" section.
1 Front fender 1
2 Steering stem nut 1
3 Front fork 2 Refer to "FRONT FORK" section.
4 Upper bracket 1
5 Steering ring nut 1 Refer to removal section.
6 Lower bracket 1
7 Bearing race cover 1
8 Upper bearing 1
9 Lower bearing 1 Refer to removal section.

5-29
STEERING
10 Bearing race 2 Refer to removal section. Order Part name Q'ty Remarks

5-30
STEERING
HANDLING NOTE
Support the machine securely so
there is no danger of it falling over.
REMOVING THE STEERING RING
NUT
1. Remove:
• Steering ring nut "1"
Use the steering nut wrench "2".
Support the steering stem so that
it may not fall down.
REMOVING THE LOWER
BEARING
1. Remove:
• Lower bearing "1"
Use the floor chisel "2".
Take care not to damage the steer-
ing shaft thread.
REMOVING THE BEARING RACE
1. Remove:
• Bearing race "1"
Remove the bearing race using
long rod "2" and the hammer.CHECKING THE STEERING STEM
1. Inspect:
• Steering stem "1"
Bend/damage→Replace.
CHECKING THE BEARING AND
BEARING RACE
1. Wash the bearings and bearing
races with a solvent.
2. Inspect:
•Bearing "1"
• Bearing race
Pitting/damage→Replace bear-
ings and bearing races as a set.
Install the bearing in the bearing
races. Spin the bearings by hand.
If the bearings hang up or are not
smooth in their operation in the
bearing races, replace bearings
and bearing races as a set.
INSTALLING THE LOWER
BRACKET
1. Install:
• Lower bearing "1"
Apply the lithium soap base grease
on the dust seal lip and bearing inner
circumference.
2. Install:
• Bearing race
• Upper bearing "1"
• Bearing race cover "2"
Apply the lithium soap base grease
on the bearing and bearing race cov-
er lip.
3. Install:
• Lower bracket "1"
Apply the lithium soap base grease
on the bearing, the portion "a" and
thread of the steering stem.
4. Install:
• Steering ring nut "1"
Install the steering nut with its
stepped side "a" facing downward.
Tighten the steering ring nut using
the steering nut wrench "2".
Refer to "CHECKING AND AD-
JUSTING THE STEERING
HEAD" section in the CHAPTER
3.
5. Check the steering stem by turn-
ing it lock to lock. If there is any
binding, remove the steering stem
assembly and inspect the steer-
ing bearings. Steering nut wrench:
YU-33975/90890-01403
Steering ring nut:
7 Nm (0.7 m•kg, 5.1 ft•
lb)

5-31
STEERING
6. Install:
• Washer "1"
7. Install:
• Front fork "1"
• Upper bracket "2"
• Temporarily tighten the pinch bolts
(lower bracket).
• Do not tighten the pinch bolts (up-
per bracket) yet.
8. Install:
• Steering stem nut "1"
Apply the lithium soap base grease
on the contact surface of the steering
stem nut when installing.
9. After tightening the nut, check the
steering for smooth movement. If
not, adjust the steering by loosen-
ing the steering ring nut little by lit-
tle.10. Adjust:
• Front fork top end "a"
11. Tighten:
• Pinch bolt (upper bracket) "1"
• Pinch bolt (lower bracket) "2"
Tighten the lower bracket to speci-
fied torque. If torqued too much, it
may cause the front fork to mal-
function.Steering stem nut:
145 Nm (14.5 m•kg, 105
ft•lb)
Front fork top end (stan-
dard) "a":
0 mm (0 in)
Pinch bolt (upper brack-
et):
21 Nm (2.1 m•kg, 15
ft•lb)
Pinch bolt (lower brack-
et):
21 Nm (2.1 m•kg, 15
ft•lb)