steering YAMAHA YZ85 2003 User Guide

3 - 32
INSP
ADJ
EC36T000
WHEEL INSPECTION
1. Inspect:

Wheel runout
Elevate the wheel and turn it.
Abnormal runout → Replace.
5PA30700
2. Inspect:

Bearing free play
Exist play → Replace.
5PA30710
STEERING HEAD INSPECTION AND
ADJUSTMENT
1. Elevate the front wheel by placing a suit-
able stand under the engine.
2. Check:

Steering stem
Grasp the bottom of the forks and gently
rock the fork assembly back and forth.
Free play → Adjust steering head.
3. Check:

Steering smooth action
Turn the handlebar lock to lock.
Unsmooth action → Adjust steering ring
nut.
5PA30720
5PA30730
WHEEL INSPECTION/
STEERING HEAD INSPECTION AND ADJUSTMENT

3 - 33
INSP
ADJ
STEERING HEAD INSPECTION AND ADJUSTMENT
4. Adjust:

Steering ring nut
Steering ring nut adjustment steps:

Remove the number plate.

Remove the handlebar and handlebar
upper bracket.

Loosen the steering ring nut 1 using the
steering nut wrench 2.
Steering nut wrench:
YU-33975/90890-01403

Tighten the steering ring nut 3 using
steering nut wrench 4.
NOTE:

Install the steering ring nut with its larger
chamfered side a downward.

Set the torque wrench to the steering nut
wrench so that they form a right angle.
Steering nut wrench:
YU-33975/90890-01403
T R..
Steering ring nut (initial tighten-
ing):
38 Nm (3.8 m  kg, 27 ft  lb)

Loosen the steering ring nut one turn.

Retighten the steering ring nut using the
steering nut wrench.
WARNING
Avoid over-tightening.
T R..
Steering ring nut (final tighten-
ing):
4 Nm (0.4 m  kg, 2.9 ft  lb)
5PA30740
5PA30740

3 - 34
INSP
ADJ

Check the steering stem by turning it lock
to lock. If there is any binding, remove the
steering stem assembly and inspect the
steering bearings.

Install the upper bracket 5, washer, steer-
ing stem nut 6, handlebar 7, handlebar
upper holder 8 and number plate 9.
NOTE:

The upper handlebar holder should be
installed with the punched mark a for-
ward.

Insert the end of fuel breather hose 0 into
the hole of the steering stem.
CAUTION:
First tighten the bolts on the front side of
the handlebar holder, and then tighten
the bolts on the rear side.
T R..
Steering stem nut:
125 Nm (12.5 m  kg, 90 ft  lb)
Handlebar upper holder:
27 Nm (2.7 m  kg, 19 ft  lb)
Pinch bolt (upper bracket):
22 Nm (2.2 m  kg, 16 ft  lb)
Number plate:
7 Nm (0.7 m  kg, 5.1 ft  lb)
5PA30760
STEERING HEAD INSPECTION AND ADJUSTMENT

5 - 45
CHAS
7. Install:

Engine stop switch 1

Clutch lever holder 2

Bolts (clutch lever holder) 3

Clamp 4
NOTE:
The engine stop switch and clutch lever holder
should be installed according to the dimen-
sions shown.
5PA51420
T R..4 Nm (0.4 m · kg, 2.9 ft · lb)
5PA51430
8. Install:

Clutch cable 1
NOTE:
Apply the lithium soap base grease on the
clutch cable end.
5PA51440
9. Adjust:

Clutch lever free play
Refer to “CLUTCH ADJUSTMENT” section
in the CHAPTER 3.
10. Clamp the clamp portion a of the number
plate to the handlebar.
11. Insert the end of the fuel tank breather
hose 1 into the hole of the steering stem.
5PA51450
HANDLEBAR

5 - 46
CHAS
EC560000
STEERING
5PAR0017
Extent of removal:
1 Lower bracket removal
2 Bearing removal
Extent of removal Order Part name Q’ty Remarks
STEERING REMOVAL
WARNING
Support the machine securely so there is nodanger of it falling over.
Refer to “HANDLEBAR” section. Preparation for removal Hold the machine by placing the
suitable stand under the engine.
Number plate
Handlebar
Cable guide
Front fender
1 Steering stem nut 1
2 Front fork 2 Refer to “FRONT FORK” section.
3 Upper bracket 1
4 Steering ring nut 1 Use special tool.
Refer to “REMOVAL POINTS”.
5 Lower bracket 1
6 Ball race cover 1
7 Upper bearing 1
8 Lower bearing 1 Refer to “REMOVAL POINTS”.
9Ball race 2Refer to “REMOVAL POINTS”.
2
1
STEERING

5 - 47
CHAS
EC563000
REMOVAL POINTS
Steering ring nut
1. Remove:

Steering ring nut 1
Use the steering nut wrench 2.
WARNING
Support the steering stem so that it may
not fall down.
Steering nut wrench:
YU-33975/90890-01403
5PA51470
Lower bearing
1. Remove:

Lower bearing 1
Use the floor chisel 2.
CAUTION:
Take care not to damage the steering shaft
thread.
5PA51480
EC563400
Ball race
1. Remove:

Ball race 1
Remove the ball race using long rod 2 and
the hammer.
5PA51490
EC564000
INSPECTION
Steering stem
1. Inspect:

Steering stem 1
Bend/damage → Replace.
5PA51500
STEERING

5 - 48
CHAS
EC564101
Bearing and ball race
1. Wash the bearings and ball races with a
solvent.
2. Inspect:

Bearing 1

Ball race
Pitting/damage → Replace bearings and
ball races as a set.
Install the bearing in the ball races. Spin
the bearings by hand. If the bearings hang
up or are not smooth in their operation in
the ball races, replace bearings and ball
races as a set.
5PA51510
EC565000
ASSEMBLY AND INSTALLATION
Lower bracket
1. Install:

Lower bearing 1
NOTE:
Apply the lithium soap base grease on the
bearing inner circumference.
5PA51520
2. Install:

Ball race

Upper bearing 1
NOTE:
Apply the lithium soap base grease on the
bearing.
5PA51530
3. Install:

Lower bracket 1
NOTE:
Apply the lithium soap base grease on the
bearing.
5PA51540
STEERING

5 - 49
CHAS
4. Install:

Washer 1

Ball race cover 2
5PA51550
5. Install:

Steering ring nut 1
Tighten the steering ring nut using the
steering nut wrench 2.
Refer to “STEERING HEAD INSPECTION
AND ADJUSTMENT” section in the CHAP-
TER 3.
5PA51560
T R..4 Nm (0.4 m · kg, 2.9 ft · lb)
6. Check the steering stem by turning it lock
to lock. If there is any binding, remove the
steering stem assembly and inspect the
steering bearings.
5PA51570
7. Install:

Front fork 1

Upper bracket 2
NOTE:

Temporarily tighten the pinch bolts (lower
bracket).

Do not tighten the pinch bolts (upper bracket)
yet.
5PA51580
8. Install:

Washer 1

Steering stem nut 2
5PAR0018
T R..125 Nm (12.5 m · kg, 90 ft · lb)
STEERING

5 - 50
CHAS
9. After tightening the nut, check the steering
for smooth movement. If not, adjust the
steering by loosening the steering ring nut
little by little.
10. Adjust:

Front fork top end a
Front fork top end (standard) a:
YZ85: 24 mm (0.94 in)
YZ85LW: Zero mm (Zero in)
5PA51600
11. Tighten:

Pinch bolt (upper bracket) 1

Pinch bolt (lower bracket) 2
CAUTION:
Tighten the lower bracket to specified
torque. If torqued too much, it may cause
the front fork to malfunction.5PA51610
T R..22 Nm (2.2 m · kg, 16 ft · lb)
T R..20 Nm (2.0 m · kg, 14 ft · lb)
STEERING