wheel YAMAHA YZ426F 2001 Owner's Guide

5 - 5
CHASFRONT WHEEL AND REAR WHEEL
EC595000
ASSEMBLY AND INSTALLATION
EC595100
Front wheel
1. Install:
lBearing (left) 1
lSpacer 2
lBearing (right) 3
lOil seal 4
NOTE:
lApply the lithium soap base grease on the
bearing and oil seal lip when installing.
lUse a socket that matches the outside diam-
eter of the race of the bearing.
lLeft side of bearing shall be installed first.
lInstall the oil seal with its manufacture’s
marks or numbers facing outward.
ACHTUNG:CAUTION:
Do not strike the inner race of the bearing.
Contact should be made only with the outer
race.
2. Install:
lBrake disc 1
lBolt (brake disc) 2
NOTE:
Tighten the bolts in stage, using a crisscross
pattern.
New
T R..12 Nm (1.2 m · kg, 8.7 ft · lb)
3. Install:
lCollar 1
NOTE:
lApply the lithium soap base grease on the oil
seal lip.
lInstall the collars with their projections a
facing the wheel.
4. Install:
lWheel
NOTE:
Install the brake disc 1 between the brake
pads 2 correctly.

5 - 6
CHASFRONT WHEEL AND REAR WHEEL
5. Install:
lWheel axle 1
NOTE:
Apply the lithium soap base grease on the
wheel axle.
6. Install:
lNut (wheel axle) 1
T R..105 Nm (10.5 m · kg, 75 ft · lb)
7. Tighten:
lBolt (axle holder) 1
NOTE:
Before tightening the bolt, fit the wheel axle to
the axle holder by stroking the front fork sev-
eral times with the front brake applied.
8. Install:
lBrake hose 1
To brake hose holder 2.
NOTE:
Before tightening the bolt (brake hose holder),
pass the brake hose in front of the axle boss
a, then fit it into the hose groove b so that the
brake hose does not contact the nut (wheel
axle).
T R..23 Nm (2.3 m · kg, 17 ft · lb)
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)

5 - 7
CHASFRONT WHEEL AND REAR WHEEL
9. Install:
lHose cover 1
lPlain washer 2
lBolt [hose cover (M8)] 3
lBolt [hose cover (M6)] 4
T R..16 Nm (1.6 m · kg, 11 ft · lb)
T R..7 Nm (0.7 m · kg, 5.1 ft · lb)
EC5251A0
Rear wheel
1. Install:
lBearing (right) 1
lCirclip 2
lSpacer 3
lBearing (left) 4
lOil seal 5
NOTE:
lApply the lithium soap base grease on the
bearing and oil seal lip when installing.
lInstall the bearing with seal facing outward.
lUse a socket that matches the outside diam-
eter of the race of the bearing.
lRight side of bearing shall be installed first.
lInstall the oil seal with its manufacture’s
marks or numbers facing outward.
ACHTUNG:CAUTION:
Do not strike the inner race of the bearing.
Contact should be made only with the outer
race.
New
New
2. Install:
lBrake disc 1
lBolt (brake disc) 2
NOTE:
Tighten the bolts in stage, using a crisscross
pattern.
T R..14 Nm (1.4 m · kg, 10 ft · lb)

5 - 8
CHAS
3. Install:
lDriven sprocket 1
lBolt (driven sprocket) 2
lPlain washer (driven sprocket) 3
lNut (driven sprocket) 4
NOTE:
Tighten the nuts in stage, using a crisscross
pattern.
T R..42 Nm (4.2 m · kg, 30 ft · lb)
FRONT WHEEL AND REAR WHEEL
4. Install:
lCollar 1
NOTE:
Apply the lithium soap base grease on the oil
seal lip.
5. Install:
lWheel
NOTE:
Install the brake disc 1 between the brake
pads 2 correctly.
6. Install:
lDrive chain 1
NOTE:
Push the wheel 2 forward and install the drive
chain.
7. Install:
lChain puller (left) 1
lWheel axle 2
NOTE:
lInstall the chain puller (left), and insert the
wheel axle from left side.
lApply the lithium soap base grease on the
wheel axle.

5 - 9
CHASFRONT WHEEL AND REAR WHEEL
8. Install:
lChain puller (right) 1
lPlain washer 2
lNut (wheel axle) 3
NOTE:
Temporarily tighten the nut (wheel axle) at this
point.
9. Adjust:
lDrive chain slack a
Refer to “DRIVE CHAIN SLACK
ADJUSTMENT” section in the CHAP-
TER 3.
Drive chain slack:
40 ~ 50 mm (1.6 ~ 2.0 in)
10. Tighten:
lNut (wheel axle) 1
lLocknut 2
T R..125 Nm (12.5 m · kg, 90 ft · lb)

5 - 11
CHAS
EC5A8100
REAR BRAKE
Extent of removal:1 Caliper removal2 Brake hose removal
3 Master cylinder removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removalREAR BRAKE REMOVAL
Hold the machine by placing the
suitable stand under the engine.
WARNING
Support the machine securely so there is nodanger of it falling over.
Rear wheel Refer to “FRONT WHEEL AND REAR
WHEEL” section.
Drain the brake fluid. Refer to “REMOVAL POINTS”.
1 Pad pin plug 1 Remove when loosening the pad pin.
2 Pad pin 1 Loosen when disassembling the caliper.
3 Caliper 1
4 Brake hose holder 2
5 Union bolt 2
6 Brake hose 1
7 Brake pedal 1
8 Reservoir tank 1
9 Reservoir hose 1
10 Master cylinder 1
3
1
321
FRONT BRAKE AND REAR BRAKE

5 - 19
CHAS

FRONT BRAKE AND REAR BRAKE
2. Install:
l
Disc cover
1

l
Bolt (disc cover)
2

T R..7 Nm (0.7 m · kg, 5.1 ft · lb)

3. Install:
l
Copper washer
1

l
Brake hose
2

l
Union bolt
3

WARNING

Always use new copper washers.
ACHTUNG:CAUTION:

Install the brake hose to the caliper with the
paint
a
on the pipe facing the caliper and
with the pipe contacting the caliper projec-
tion
b
.
New
T R..30 Nm (3.0 m · kg, 22 ft · lb)

4. Install:
l
Caliper
1

l
Rear wheel
2

Refer to “FRONT WHEEL AND REAR
WHEEL” section.
5. Tighten:
l
Pad pin
3

6. Install:
l
Pad pin plug
4

T R..18 Nm (1.8 m · kg, 13 ft · lb)
T R..3 Nm (0.3 m · kg, 2.2 ft · lb)

5 - 23
CHASFRONT BRAKE AND REAR BRAKE
4. Install:
lPin 1
lPlain washer 2
lCotter pin 3
NOTE:
After installing, check the brake pedal height.
Refer to “REAR BRAKE ADJUSTMENT” sec-
tion in the CHAPTER 3.
New
Front brake hose
1. Install:
lBrake hose 1
To brake hose holder 2.
NOTE:
Before tightening the bolt (brake hose holder),
pass the brake hose in front of the axle boss
a, then fit it into the hose groove b so that the
brake hose does not contact the nut (wheel
axle).
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
2. Install:
lHose cover 1
lPlain washer 2
lBolt [hose cover (M8)] 3
lBolt [hose cover (M6)] 4
T R..16 Nm (1.6 m · kg, 11 ft · lb)
T R..7 Nm (0.7 m · kg, 5.1 ft · lb)
3. Pass the brake hose through the cable
guide 1, then through the guide a on
the protector 2.

5 - 27
CHASFRONT FORK
EC550000
FRONT FORK
Extent of removal:1 Front fork removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removalFRONT FORK REMOVAL
Hold the machine by placing the
suitable stand under the engine.
WARNING
Support the machine securely so there is nodanger of it falling over.
Front wheel Refer to “FRONT WHEEL AND REAR
WHEEL” section.
Front caliper Refer to “FRONT BRAKE AND REAR
BRAKE” section.
Number plate
Handlebar Refer to “HANDLEBAR” section.
1 Protector 1
2 Brake hose holder 2
3 Pinch bolt (handle crown) 2 Only loosening.
4 Cap bolt 1Loosen when disassembling the front fork.
5 Pinch bolt (under bracket) 2 Only loosening.
6 Front fork 1
1

5 - 39
CHAS

FRONT FORK
4. Tighten:
l
Pinch bolt (handle crown)
1

l
Pinch bolt (under bracket)
2

ACHTUNG:CAUTION:

Tighten the under bracket to specified
torque. If torqued too much, it may cause
the front fork to malfunction.
5. Install:
l
Brake hose holder
1

l
Caliper
2

l
Bolt (caliper)
3

NOTE:

Fit the brake hose holder cut
a
over the pro-
jection
b
on the front fork and clamp the brake
hose.
6. Install:
l
Brake hose holder
1

l
Bolt (brake hose holder)
2

l
Protector
3

l
Bolt (protector)
4

NOTE:

When installing the brake hose holder, pass
the brake hose
5
in front of the axle boss
a
,
then fit it into the hose groove
b
so that the
brake hose does not contact the nut (wheel
axle).
T R..23 Nm (2.3 m · kg, 17 ft · lb)
T R..20 Nm (2.0 m · kg, 14 ft · lb)
T R..23 Nm (2.3 m · kg, 17 ft · lb)
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)

7. Adjust:
l
Rebound damping force
NOTE:

Turn in the damping adjuster
1
finger-tight
and then turn out to the originally set position.