warning YAMAHA YZ85 2004 Owner's Guide

5 - 25
CHAS
Brake fluid
1. Fill:

Brake fluid
Until the fluid level reaches “LOWER” level
line a.
WARNING

Use only the designated quality brake
fluid:
otherwise, the rubber seals may deterio-
rate, causing leakage and poor brake per-
formance.

Refill with the same type of brake fluid;
mixing fluids may result in a harmful
chemical reaction and lead to poor perfor-
mance.

Be careful that water does not enter the
master cylinder when refilling. Water will
significantly lower the boiling point of the
fluid and may result in vapor lock.
CAUTION:
Brake fluid may erode painted surfaces or
plastic parts. Always clean up spilled fluid
immediately.
ÈFront
ÉRear
2. Air bleed:

Brake system
Refer to “BRAKE SYSTEM AIR BLEED-
ING” section in the CHAPTER 3.
Recommended brake fluid:
DOT #4
È
5PA50770
É
5PA50780
3. Inspect:

Brake fluid level
Fluid at lower level → Fill up.
Refer to “BRAKE FLUID LEVEL INSPEC-
TION” section in the CHAPTER 3.
FRONT BRAKE AND REAR BRAKE

5 - 27
CHASFRONT FORK
EC550000
FRONT FORK
5PA50820
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 no
danger of it falling over.
Front wheel Refer to “FRONT WHEEL AND REAR
WHEEL” section.
Front brake caliper Refer to “FRONT BRAKE AND REAR
BRAKE” section.
Number plate
Handlebar Refer to “HANDLEBAR” section.
1 Protector 1
2 Brake hose holder 1
3 Pinch bolt (upper bracket) 1 Only loosening.
4 Cap bolt 1 Loosen when disassembling the front fork.
5 Pinch bolt (lower bracket) 2 Only loosening.
6 Front fork 1
1

5 - 31
CHAS
EC554200
Base valve
1. Inspect:

Valve assembly 1
Wear/damage → Replace.

O-ring 2
Damage → Replace.
5PA50900
EC554400
Fork spring
1. Measure:

Fork spring free length a
Out of specification → Replace.
EC554502
Inner tube
1. Inspect:

Inner tube surface a
Score marks → Repair or replace.
Use #1,000 grit wet sandpaper.
Damaged oil lock piece → Replace.

Inner tube bends
Out of specification → Replace.
Use the dial gauge 1.
NOTE:
The bending value is shown by one half of the
dial gauge reading.
WARNING
Do not attempt to straighten a bent inner
tube as this may dangerously weaken the
tube.
EC554600
Outer tube
1. Inspect:

Outer tube 1
Score marks/wear/damage → Replace.
Fork spring free length:
430 mm (16.9 in)
: 425 mm (16.7 in)
Inner tube bending limit:
0.2 mm (0.008 in)
5PA50910
5PA50920
5PA50930
FRONT FORK

5 - 36
CHAS
19. Wait ten minutes until the air bubbles have
been removed from the front fork, and the
oil has dispense evenly in system before
setting recommended oil level.
NOTE:
Fill with the fork oil up to the top end of the
outer tube, or the fork oil will not spread over to
every part of the front forks, thus making it
impossible to obtain the correct level.
Be sure to fill with the fork oil up to the top of
the outer tube and bleed the front forks.
20. Measure:

Oil level (left and right) a
Out of specification → Adjust.
NOTE:
Be sure to install the spring guide 2 when
checking the oil level.
WARNING
Never fail to make the oil level adjustment
between the maximum and minimum level
and always adjust each front fork to the
same setting. Uneven adjustment can
cause poor handling and loss of stability.
Standard oil level:
90 mm (3.54 in)
Extent of adjustment:
80 ~ 120 mm (3.15 ~ 4.72 in)
From top of outer tube with
inner tube and damper rod 1
fully compressed without
spring.
5PA51120
FRONT FORK

5 - 42
CHAS
REMOVAL POINTS
Brake master cylinder
1. Remove:

Brake master cylinder bracket 1

Brake master cylinder 2
CAUTION:

Do not let the brake master cylinder hang
on the brake hose.

Keep the brake master cylinder cap side
horizontal to prevent air from coming in.
5PA51300
EC5B3200
Grip
1. Remove:

Grip 1
NOTE:
Blow in air between the handlebar or tube
guide and the grip. Then remove the grip
which has become loose.
5PA51310
EC5B4000
INSPECTION
EC5B4100
Handlebar
1. Inspect:

Handlebar 1
Bends/cracks/damage → Replace.
WARNING
Do not attempt to straighten a bent handle-
bar as this may dangerously weaken the
handlebar.
5PA51320
HANDLEBAR

5 - 44
CHAS
4. Install:

Collar 1

Tube guide 2

Grip cap (upper) 3

Throttle cable 4
NOTE:
Apply the lithium soap base grease on the
throttle cable end and tube guide cable wind-
ing portion.5PA51380
5. Install:

Throttle cable cap 1

Screw (throttle cable cap) 2

Grip cap (lower) 3

Screw (grip cap) 4

Cover (grip cap) 5
WARNING
After tightening the screws, check that the
throttle grip 6 moves smoothly. If it does
not, retighten the screws (grip cap) for
adjustment.
5PA51390
T R..1 Nm (0.1 m · kg, 0.7 ft · lb)
T R..4 Nm (0.4 m · kg, 2.9 ft · lb)
5PA51400
6. Install:

Brake master cylinder 1

Brake master cylinder bracket 2

Bolt (brake master cylinder bracket) 3
NOTE:

Install the bracket so that the arrow mark a
face upward.

First tighten the bolts on the upper side of the
brake master cylinder bracket, and then
tighten the bolts on the lower side.
5PA51410
T R..9 Nm (0.9 m · kg, 6.5 ft · lb)
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 no
danger 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 - 51
CHASSWINGARM
EC570000
SWINGARM
5PAR0019
Extent of removal:
1 Swingarm removal
Extent of removal Order Part name Q’ty Remarks
SWINGARM REMOVAL
WARNING
Support the machine securely so there is no
danger of it falling over.
Preparation for removal Hold the machine by placing the
suitable stand under the engine.
Real wheel Refer to “FRONT WHEEL AND REAR
WHEEL” section.
Brake hose holder
Rear brake caliper
Drive chainRefer to “FRONT BRAKE AND REAR
BRAKE” section.
1 Drive chain support 1
2 Bolt (connecting rod) 1 Hold the swingarm.
3 Bolt (rear shock absorber-relay
arm)1
4 Pivot shaft 1
5 Swingarm 1
1

5 - 58
CHASREAR SHOCK ABSORBER
EC580000
REAR SHOCK ABSORBER
5PA51870
Extent of removal:
1 Rear shock absorber removal
2 Rear shock absorber disassembly
Extent of removal Order Part name Q’ty Remarks
Preparation for removalREAR SHOCK ABSORBER
REMOVAL
Hold the machine by placing the
suitable stand under the engine.
WARNING
Support the machine securely so there is no
danger of it falling over.
Seat Refer to “SEAT, FUEL TANK AND SIDE
COVERS” section in the CHAPTER 4.
Silencer Refer to “EXHAUST PIPE AND
SILENCER” section in the CHAPTER 4.
1 Clamp (air cleaner joint) 1 Only loosening.
2Rear frame 1
3 Bolt (rear shock absorber-relay
arm)1 Hold the swingarm.
4 Bolt (rear shock absorber-frame) 1
5 Rear shock absorber 1
6 Locknut 1 Only loosening.
7 Adjuster 1 Only loosening.
8 Spring guide 1
9 Spring (rear shock absorber) 1
1
2