2004 YAMAHA YZ85 relay

SPEC
2 - 13
MAINTENANCE SPECIFICATIONS
NOTE:
- marked portion shall be checked for torque tightening after break-in or before each race.Part to be tightened Thread size Q’tyTightening torque
Nm m·kg ft·lb
Nipple (spoke)—64 3 0.3 2.2
Rear wheel sprocket M8 × 1.25 4 42 4.2 30
Rear brake caliper protector M6 × 1.0 1 10 1.0 7.2
Drive chain puller adjust bolt and locknut M8 × 1.25 2 16 1.6 11
Engine mounting:
Engine and frame (front) M10 × 1.25 1 69 6.9 50
Engine and frame (lower) M10 × 1.25 1 69 6.9 50
Pivot shaft and nut M12 × 1.25 1 63 6.3 45
Relay arm and frame M10 × 1.25 1 54 5.4 39
Relay arm and connecting rod M12 × 1.25 1 53 5.3 38
Connecting rod and swingarm M12 × 1.25 1 53 5.3 38
Rear shock absorber and frame M10 × 1.25 1 36 3.6 25
Rear shock absorber and relay arm M10 × 1.25 1 36 3.6 25
Rear frame (upper) M8 × 1.25 1 26 2.6 19
Rear frame (lower) M8 × 1.25 2 16 1.6 11
Swingarm and brake hose holder M5 × 0.8 4 1 0.1 0.7
Drive chain tensioner (upper) M8 × 1.25 1 23 2.3 17
Drive chain tensioner (lower) M6 × 1.0 1 10 1.0 7.2
Drive chain support M8 × 1.25 2 16 1.6 11
Drive chain support cover M6 × 1.0 1 7 0.7 5.1
Seal guard and swingarm M6 × 1.0 2 10 1.0 7.2
Fuel tank M6 × 1.0 2 7 0.7 5.1
Fuel cock M6 × 1.0 2 4 0.4 2.9
Fuel tank bracket and fuel tank M6 × 1.0 4 7 0.7 5.1
Seat set bracket and fuel tank M6 × 1.0 1 7 0.7 5.1
Radiator cover M6 × 1.0 3 4 0.4 2.9
Front fender M6 × 1.0 4 7 0.7 5.1
Rear fender M6 × 1.0 4 7 0.7 5.1
Flap guard M6 × 1.0 2 7 0.7 5.1
Side cover M6 × 1.0 2 7 0.7 5.1
Seat M6 × 1.0 2 7 0.7 5.1
Number plate M6 × 1.0 1 7 0.7 5.1

3 - 2
INSP
ADJ
MAINTENANCE INTERVALS
COOLING SYSTEM
Check coolant level and leakage
Check radiator cap operation
Replace coolant
Inspect hoses








Every two years
OUTSIDE NUTS AND BOLTS
Retighten



AIR FILTER
Clean and lubricate
Replace




Use foam air-filter oil or
equivalent oil
FRAME
Clean and inspect



FUEL TANK, COCK
Clean and inspect



BRAKES
Adjust lever position and pedal height
Lubricate pivot point
Check brake disc surface
Check fluid level and leakage
Retighten brake disc bolts, caliper
bolts, master cylinder bolts and union
bolts
Replace pads
Replace brake fluid























Every one year
FRONT FORKS
Inspect and adjust
Replace oil
Replace oil seal









Suspension oil “01”
FRONT FORK OIL SEAL AND DUST
SEAL
Clean and lube


Lithium base grease
REAR SHOCK ABSORBER
Inspect and adjust
Lube
Retighten







(After
rain ride)


Molybdenum disulfide
grease
DRIVE CHAIN GUIDE, ROLLERS AND
SUPPORT
Inspect


SWINGARM
Inspect and retighten
Lube







Molybdenum disulfide
grease
RELAY ARM, CONNECTING ROD
Inspect and retighten
Lube







Molybdenum disulfide
grease
STEERING HEAD
Inspect free play and retighten
Clean and lube
Replace bearing







Lithium base grease ItemAfter
break-inEvery
raceEvery
third
raceEvery
fifth
raceAs re-
quiredRemarks


3

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 - 52
CHAS
EC578000
SWINGARM DISASSEMBLY
5PAR0020
Extent of removal:
1 Swingarm disassembly
2 Connecting rod removal and disassembly
3 Relay arm removal and disassembly
Extent of removal Order Part name Q’ty Remarks
SWINGARM DISASSEMBLY
1 Relay arm 1
2 Connecting rod 1
3 Cover 2
4 Dust seal 2
5 Collar 5
6 Bushing 4
7 Oil seal 8
8 Bearing 9
Refer to “REMOVAL POINTS”.
9 Bushing (swingarm)
2
1
2
2
3
3
SWINGARM

5 - 53
CHAS
EC573000
REMOVAL POINTS
Bearing and bushing
1. Remove:

Bearing 1

Bushing (swingarm) 2
From swingarm.
NOTE:
Remove the bushing by pressing.5PA51640
2. Remove:

Bearing 1
From relay arm and connecting rod.
NOTE:
Remove the bearing by pressing its outer race.
5PAR0021
1
5PAR0022
INSPECTION
Wash the bearings, bushings, collars, and cov-
ers in a solvent.
Swingarm
1. Inspect:

Bearing 1

Bushing 2

Collar 3
Free play exists/unsmooth revolution/rust
→ Replace bearing, bushing and collar as
a set.
2. Inspect:

Oil seal 4
Damage → Replace.
5PA51680
SWINGARM

5 - 54
CHAS
Relay arm
1. Inspect:

Bearing 1

Bearing (polylube bearing) 2

Bushing 3
Free play exists/unsmooth revolution/rust
→ Replace bearing and bushing as a set.
2. Inspect:

Bearing (polylube bearing) 2
Loss of solid lubrication → Replace.

Oil seal 4
Damage → Replace.
NOTE:
Polylube bearings, with solid lubrication, have
been adopted with the intent to make the nee-
dle bearings, used in this model, maintenance
free. With polylube bearings, no grease nipple
and regular lubrication is necessary. However,
grease should be applied to all oil seals and
collars when removed or installed.
Connecting rod
1. Inspect:

Bearing 1

Bushing 2
Free play exists/unsmooth revolution/rust
→ Replace bearing and bushing as a set.
2. Inspect:

Oil seal 3
Damage → Replace.
5PAR0023
5PA51700
EC575000
ASSEMBLY AND INSTALLATION
Bearing, bushing and oil seal
1. Install:

Bearing 1

Bushing (swingarm) 2

Oil seal 3
To swingarm.
NOTE:

Apply the molybdenum disulfide grease on
the bearing and bushing when installing.

Install the bearing by pressing it on the side
having the manufacture’s marks or numbers.

First install the bushing and then the bearing
to a specified depth from inside.
Installed depth of bearings and
bushings:
Bearing a: 4.5 mm (0.18 in)
Bushing b: 4.5 mm (0.18 in)
5PA51730
5PA51740
SWINGARM

5 - 55
CHAS
2. Install:

Bearing 1

Oil seal 2
To relay arm.
NOTE:

Apply the molybdenum disulfide grease on
the bearing when installing.

Install the bearing by pressing it on the side
having the manufacture’s marks or numbers.
Installed depth of bearings:
Depth a: 4.5 mm (0.18 in)
Depth b: 0.5 mm (0.02 in)
Depth c: 4.0 mm (0.16 in)
5PA51750
5PA51760
c1
3. Install:

Bearing 1

Oil seal 2
To connecting rod.
NOTE:

Apply the molybdenum disulfide grease on
the bearing when installing.

Install the bearing by pressing it on the side
having the manufacture’s marks or numbers.
Installed depth of bearings a:
6.5 mm (0.26 in)
5PA51760
Swingarm
1. Install:

Collar 1
To swingarm 2.
NOTE:
Apply the molybdenum disulfide grease on the
collars, bearings, bushings and oil seal lips.
5PA51770
SWINGARM

5 - 56
CHAS
2. Install:

Bushing 1

Collar 2

Dust seal 3

Cover 4
To relay arm 5.
NOTE:
Apply the molybdenum disulfide grease on the
bushings, dust seals, collars, cover lips, bear-
ings and oil seal lips.
3. Install:

Bushing 1
To connecting rod 2.
NOTE:
Apply the molybdenum disulfide grease on the
bushings, bearings and oil seal lips.
5PAR0025
5PA51790
4. Install:

Connecting rod 1

Washer 2

Bolt (connecting rod) 3

Nut (connecting rod) 4
To swingarm 5.
NOTE:
Apply the molybdenum disulfide grease on the
bolt.
5PA51800
T R..53 Nm (5.3 m · kg, 38 ft · lb)
5. Install:

Relay arm 1

Bolt (relay arm) 2

Nut (relay arm) 3
NOTE:
Apply the molybdenum disulfide grease on the
bolt.
5PA51810
T R..54 Nm (5.4 m · kg, 39 ft · lb)
SWINGARM