2003 YAMAHA YZ85 transmission oil

3 - 4
INSP
ADJ
PRE-OPERATION INSPECTION AND MAINTENANCE
EC320000
PRE-OPERATION INSPECTION AND MAINTENANCE
Before riding for break-in operation, practice or a race, make sure the machine is in good operating
condition.
Before using this machine, check the following points.
GENERAL INSPECTION AND MAINTENANCE
Item Routine Page
CoolantCheck that coolant is filled up to the radiator cap.
Check the cooling system for leakage.P.3-5 ~ 9
FuelCheck that a fresh mixture of oil and gasoline is filled in the fuel
tank. Check the fuel line for leakage.P.1-12
Transmission oilCheck that the oil level is correct. Check the crankcase for leak-
age.P.3-12 ~ 13
Gear shifter and clutchCheck that gears can be shifted correctly in order and that the
clutch operates smoothly.P.3-9
Throttle grip/HousingCheck that the throttle grip operation and free play are correctly
adjusted. Lubricate the throttle grip and housing, if necessary.P.3-10
Brakes Check the play of front brake and effect of front and rear brake. P.3-16 ~ 21
Drive chainCheck drive chain slack and alignment. Check that the drive
chain is lubricated properly.P.3-22 ~ 24
WheelsCheck for excessive wear and tire pressure. Check for loose
spokes and have no excessive play.P.3-31 ~ 32
SteeringCheck that the handlebar can be turned smoothly and have no
excessive play.P.3-32 ~ 34
Front forks and rear shock
absorberCheck that they operate smoothly and there is no oil leakage. P.3-24 ~ 30
Cables (wires)Check that the clutch and throttle cables move smoothly. Check
that they are not caught when the handlebars are turned or
when the front forks travel up and down.—
Exhaust pipe and silencerCheck that the exhaust pipe is tightly mounted and has no
cracks.P.4-2
Rear wheel sprocket Check that the rear wheel sprocket tightening bolt is not loose. P.3-22
Lubrication Check for smooth operation. Lubricate if necessary. P.3-35
Bolts and nuts Check the chassis and engine for loose bolts and nuts. P.1-16
Lead connectorsCheck that the CDI magneto, CDI unit, and ignition coil are con-
nected tightly.P.1-6
SettingsIs the machine set suitably for the condition of the racing course
and weather or by taking into account the results of test runs
before racing? Are inspection and maintenance completely
done?P.7-1 ~ 19

3 - 12
INSP
ADJ
TRANSMISSION OIL REPLACEMENT
5. Install:

Air filter guide 1
To air filter element 2.
5PA30170
6. Apply:

Lithium soap base grease
On the matching surface a on air filter ele-
ment.
5PA30180
7. Install:

Air filter element 1

Washer

Fitting bolt
NOTE:
Install the air filter element with its projection
a facing upward.
5PA30190
T R..2 Nm (0.2 m · kg, 1.4 ft · lb)
TRANSMISSION OIL REPLACEMENT
1. Start the engine and warm it up for several
minutes, and then turn off the engine and
wait for five minute.
2. Place the machine on a level place and
hold it on upright position by placing the
suitable stand under the engine.
3. Place a suitable container under the
engine.
4. Remove:

Oil drain bolt 1

Oil filler cap 2
Drain the transmission oil.
5PA30200

3 - 13
INSP
ADJ
TRANSMISSION OIL REPLACEMENT
5. Measure:

Transmission oil capacity
Out of specification → Adjust.
Oil capacity (periodic oil change):
0.50 L (0.44 Imp qt, 0.52 US qt)
6. Install:

Copper washer

Oil drain bolt 1
5PA30210
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
7. Fill:

Transmission oil
Recommended oil:
Yamalube 4 (10W-30) or SAE
10W-30 type SE motor oil
Oil capacity (periodic oil change):
0.50 L (0.44 Imp qt, 0.52 US qt)
8. Check:

Oil leakage
9. Install:

Oil filter cap 1
5PA30220

4 - 26
ENGCLUTCH AND PRIMARY DRIVEN GEAR
EC490000
CLUTCH AND PRIMARY DRIVEN GEAR
EC498000
CLUTCH PLATE AND FRICTION PLATE
5PA40720
Extent of removal:
1 Clutch plate and friction plate removal
Extent of removal Order Part name Q’ty Remarks
CLUTCH PLATE AND FRIC-
TION PLATE REMOVAL
Preparation for removal Drain the transmission oil. Refer to “TRANSMISSION OIL
REPLACEMENT” section in the CHAP-
TER 3.
Clutch cable Disconnect at engine side.
1 Clutch cover 1
2 Bolt (clutch spring) 5
3 Clutch spring 5
4 Pressure plate 1
5 Friction plate 7
6 Clutch plate 6
1

4 - 30
ENG
ASSEMBLY AND INSTALLATION
Push lever shaft
1. Install:

Push lever shaft 1
NOTE:

Apply the lithium soap base grease on the oil
seal lip and push lever shaft end.

Apply the transmission oil on the push lever
shaft.5PAR0027
Clutch
1. Install:

Washer [thickness 2 mm (0.08 in)] 1

Spacer 2

Primary driven gear 3
NOTE:
Apply the transmission oil on the washer,
spacer and primary driven gear inner circum-
ference.
2. Install:

Washer [thickness 4 mm (0.16 in)] 1

Clutch boss 2
5PAR0007
5PA40850
3. Install:

Conical washer 1
NOTE:
Install the conical washer to the main axle 2
as shown in the illustration.
5PA40860
CLUTCH AND PRIMARY DRIVEN GEAR

4 - 31
ENG
4. Install:

Nut (clutch boss) 1
NOTE:
Use the clutch holding tool 2 to hold the clutch
boss.
ÈFor USA and CDN
ÉExcept for USA and CDN
Clutch holding tool:
YM-91042/90890-040865PA40870
T R..70 Nm (7.0 m · kg, 50 ft · lb)
ÈÉ
5PA40880
5. Install:

Friction plate 1 1

Clutch plate 2

Friction plate 2 3
NOTE:

Install the clutch plates and friction plates
alternately on the clutch boss, starting with a
friction plate and ending with a friction plate.

Use the friction plates 1 for the first and final
while paying attention to the difference in
surface pattern.

Apply the transmission oil on the friction
plates and clutch plates.
5PA40890
5PA40900
6. Install:

Push rod 2 1

Ball 2

Push rod 1 3
NOTE:
Apply the transmission oil on the push rod 1, 2
and ball.
5PA40910
CLUTCH AND PRIMARY DRIVEN GEAR

4 - 33
ENGKICK SHAFT, SHIFT SHAFT AND PRIMARY DRIVE GEAR
KICK SHAFT, SHIFT SHAFT AND PRIMARY DRIVE GEAR
PRIMARY DRIVE GEAR
5PAR0008
Extent of removal:
1 Primary drive gear removal
Extent of removal Order Part name Q’ty Remarks
PRIMARY DRIVE GEAR
REMOVAL
Drain the transmission oil. Refer to “TRANSMISSION OIL
REPLACEMENT” section in the CHAP-
TER 3.
Brake pedal
Radiator hose 2 Disconnect at water pump side.
1 Kickstarter crank 1
2 Right crankcase cover 1
3 Nut (primary drive gear) 1 Only loosening.
Refer to “REMOVAL POINTS”.
4 Primary driven gear 1 Refer to “CLUTCH AND PRIMARY
DRIVEN GEAR” section.
5 Primary drive gear 1
1

4 - 37
ENG
2. Install:

Stopper lever assembly 1
To shift shaft 2.
NOTE:
Apply the transmission oil on the stopper lever
assembly.
5PA41070
Shift shaft
1. Install:

Shift shaft 1
NOTE:

Apply transmission oil on the shift shaft.

When installing the shift shaft, align the stop-
per lever roller with the slot on segment.

When installing the shift shaft, make sure
that the torsion spring 2 is in the position as
shown.
5PA41080
5PA41090
2. Check:

Shift lever 1 position
Gaps a and b are not equal except in
neutral → Replace the shift shaft.
5PA41100
Kick shaft assembly
1. Install:

Kick gear 1

Washer 2

Torsion spring 3
To kick shaft 4.
NOTE:
Make sure the stopper a of the torsion spring
fits into the hole c in the other side of the
stopper b of the kick shaft.
5PA41110
KICK SHAFT, SHIFT SHAFT AND PRIMARY DRIVE GEAR