2004 YAMAHA YZF-R1S steering

3-51
CHECKING AND ADJUSTING THE STEERING HEAD
CHK
ADJ
WARNING
NOTE:
NOTE:
EAS00146
CHECKING AND ADJUSTING THE
STEERING HEAD
1. Stand the motorcycle on a level surface.
Securely support the motorcycle so that
there is no danger of it falling over.
Place the motorcycle on a suitable stand so that
the front wheel is elevated.
2. Check:

steering head
Grasp the bottom of the front fork legs and
gently rock the front fork.
Binding / looseness
Adjust the steering
head.
3. Remove:

upper bracket
Refer to “HANDLEBAR” and “STEERING
HEAD” in chapter 4.
4. Adjust:

steering head
a. Remove the lock washer
1, the upper ring
nut
2, and the rubber washer 3.
b. Loosen the lower ring nut
4 and then tighten
it to specification with a steering nut wrench
5.
Set the torque wrench at a right angle to the
steering nut wrench.
Steering nut wrench
90890-01403, YU-33975
Lower ring nut (initial tightening
torque)
52 Nm (5.2 m
kg, 38 ft
lb)
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3-52
CHECKING AND ADJUSTING THE STEERING HEAD
CHK
ADJ
WARNING
NOTE:
NOTE: c. Loosen the lower ring nut
4 completely, then
tighten it to specification.
Do not overtighten the lower ring nut.
Lower ring nut
(final tightening torque)
18 Nm (1.8 m
kg, 13 ft
lb)
d. Check the steering head for looseness or
binding by turning the front fork all the way in
both directions. If any binding is felt, remove
the under bracket and check the upper and
lower bearings.
Refer to “STEERING HEAD” in chapter 4.
e. Install the rubber washer
3.
f. Install the upper ring nut
2.
g. Finger tighten the upper ring nut
2, then
align the slots of both ring nuts. If necessary,
hold the lower ring nut and tighten the upper
ring nut until their slots are aligned.
h. Install the lock washer
1.
Make sure the lock washer tabs
a sit correctly
in the ring nut slots
b.
5. Install:

upper bracket
Refer to “HANDLEBAR” and “STEERING
HEAD” in chapter 4.
6. Measure:

steering head tension
Make sure all of the cables and wires are prop-
erly routed.
a. Point the front wheel straight ahead.
b. Install a plastic locking tie
1 loosely around
the end of the handlebar as shown.
c. Hook a spring gauge
2 onto the plastic lock-
ing tie.
d. Hold the spring gauge at a 90 angle from the
handlebar, pull the spring gauge, and then
record the measurement when the handle-
bar starts to run.
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3-53
CHECKING AND ADJUSTING THE STEERING HEAD /
CHECKING THE FRONT FORKCHK
ADJ
WARNING
Steering head tension
200
500 g
e. Repeat the above procedure on the opposite
handlebar.
f. If the steering head tension is out of specifi-
cation (both handlebars should be within
specification), remove the upper bracket and
loosen or tighten the upper ring nut.
g. Reinstall the upper bracket and measure the
steering head tension again as described
above.
h. Repeat the above procedure until the steer-
ing head tension is within specification.
i. Grasp the bottom of the front fork legs and
gently rock the front fork.
Binding / looseness
Adjust the steering
head.
EAS00150
CHECKING THE FRONT FORK
1. Stand the motorcycle on a level surface.
Securely support the motorcycle so that
there is no danger of it falling over.
2. Check:

inner tube
1
Damage / scratches
Replace.

oil seal
2
Oil leakage
Replace.
3. Hold the motorcycle upright and apply the
front brake.
4. Check:

front fork operation
Push down hard on the handlebars several
times and check if the front fork rebounds
smoothly.
Rough movement
Repair.
Refer to “FRONT FORK” in chapter 4.
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4-57
HANDLEBARSCHAS
Order Job / Part Q’ty Remarks
16
17
18
19
20
21
22
23
24Brake master cylinder
Steering damper
Handlebar pinch bolt
Upper bracket bolt
Upper bracket pinch bolt
Steering stem nut
Upper bracket
Left handlebar
Right handlebar1
1
2
2
2
1
1
1
1
For assembly, reverse the disassembly
procedure.
113 Nm (11.3 m
kg, 82 ft
lb)
17 Nm (1.7 m
kg, 12 ft
lb)
11 Nm (1.1 m
kg, 8.0 ft
lb)
23 Nm (2.3 m
kg, 17 ft
lb)
13 Nm (1.3 m
kg, 9.4 ft
lb)
23 Nm (2.3 m
kg, 17 ft
lb)3.8 Nm (0.38 m
kg, 2.7 ft
lb)
3.8 Nm (0.38 m
kg, 2.7 ft
lb)
3.8 Nm (0.38 m
kg, 2.7 ft
lb)
13 Nm (1.3 m
kg, 9.4 ft
lb)
26 Nm (2.6 m
kg, 19 ft
lb)
17 Nm (1.7 m
kg, 12 ft
lb)
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4-60
HANDLEBARSCHAS
NOTE:
WARNING
6. Install:

left handlebar switch
1
Align the projection a on the left handlebar
switch with the hole
b in the left handlebar.
7. Install:

handlebar grip
a. Apply a thin coat of rubber adhesive onto the
end of the left handlebar.
b. Slide the handlebar grip over the end of the
left handlebar.
c. Wipe off any excess rubber adhesive with a
clean rag.
Do not touch the handlebar grip until the
rubber adhesive has fully dried.
8. Adjust:

clutch cable free play
Refer to “ADJUSTING THE CLUTCH
CABLE FREE PLAY” in chapter 3.
Clutch cable free play
(at the end of the clutch lever)
10
15 mm (0.39
0.59 in)
9. Adjust:

throttle cable free play
Refer to “ADJUSTING THE THROTTLE
CABLE FREE PLAY” in chapter 3.
Throttle cable free play
(at the flange of the throttle grip)
3
5 mm (0.12
0.20 in)
CHECKING THE STEERING DAMPER
1. Check:

steering damper body
Damage / oil leaks
Replace.
(It replace with the assembly.)

steering damper rod
Bends / scratch
Replace.
(It replace with the assembly.)

bearing
Damage /pitting
Replace.
(It replace with the assembly.)
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4-61
Order Job / Part Q’ty Remarks
1
2
3
4
5
6
7
8
9
10Removing the under bracket
Front wheel
Front cowling and side cowling
Front fork legs
Main switch connector
Upper bracket bolt
Left handlebar assembly
Right handlebar assembly
Steering stem nut
Upper bracket
Under bracket panel
Brake hose holder bolt
Lock washer
Upper ring nut2
2
1
1
1
1
1
1
1
1Remove the parts in the order listed.
Refer to “FRONT WHEEL AND BRAKE
DISCS”.
Refer to “COWLINGS” in chapter 3.
Refer to “FRONT FORK”.
Disconnect.
For installation, reverse the removal
procedure.
38 Nm (0.38 m
kg, 2.75 ft
lb)113 Nm (11.3 m
kg, 82 ft
lb)
52 Nm (5.2 m
kg, 38 ft
lb)
18 Nm (1.8 m
kg, 13 ft
lb)
1st
2nd23 Nm (2.3 m
kg, 17 ft
lb)
23 Nm (2.3 m
kg, 17 ft
lb)
7 Nm (0.7 m
kg, 5.1 ft
lb)
17 Nm (1.7 m
kg, 12 ft
lb)
STEERING HEADCHAS
EAS00676
STEERING HEAD
UNDER BRACKET
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4-62
STEERING HEADCHAS
Order Job / Part Q’ty Remarks
11
12
13
14
15
16
17
18
19Rubber washer
Lower ring nut
Under bracket
Bearing cover
Bearing inner race
Upper bearing
Lower bearing
Dust seal
Bearing outer race1
1
1
1
2
1
1
1
2
For assembly, reverse the disassembly
procedure.
38 Nm (0.38 m
kg, 2.75 ft
lb)113 Nm (11.3 m
kg, 82 ft
lb)
52 Nm (5.2 m
kg, 38 ft
lb)
18 Nm (1.8 m
kg, 13 ft
lb)
1st
2nd23 Nm (2.3 m
kg, 17 ft
lb)
23 Nm (2.3 m
kg, 17 ft
lb)
7 Nm (0.7 m
kg, 5.1 ft
lb)
17 Nm (1.7 m
kg, 12 ft
lb)
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4-63
STEERING HEADCHAS
WARNING
WARNING
EAS00677
REMOVING THE UNDER BRACKET
1. Stand the motorcycle on a level surface.
Securely support the motorcycle so that
there is no danger of it falling over.
2. Remove:

ring nut
1
(with the steering nut wrench 2)
Steering nut wrench
90890–01403, YU-33975
Securely support the lower bracket so that
there is no danger of it falling.
EAS00681
CHECKING THE STEERING HEAD
1. Wash:

bearings

bearing races
Recommended cleaning solvent
Kerosene
2. Check:

bearings
1

bearing races 2
Damage / pitting
Replace.
3. Replace:

bearings

bearing races
a. Remove the bearing races
1 from the steer-
ing head pipe with a long rod
2 and hammer.
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