2021 YAMAHA YZ85 maintenance

Periodic maintenance an d a djustment
7-27
7
EAU23285
Checkin g the steerin g
Worn or loose steering bearings may
cause danger. Therefore, the operation
of the steering must be checked as fol-
lows at the intervals specified in the
periodic maintenance and lubrication
chart.
1. Raise the front wheel off the ground. (See page 7-28.)
WARNING! To avoi d injury, se-
curely support the vehicle so
there is no d anger of it fallin g
over.
[EWA10752]
2. Hold the lower ends of the front fork legs and try to move them for-
ward and backward. If any free
play can be felt, have a Yamaha
dealer check or repair the steer-
ing.
EAU23292
Checkin g the wheel bearin gs
The front and rear wheel bearings must
be checked at the intervals specified in
the periodic maintenance and lubrica-
tion chart. If there is play in the wheel
hub or if the wheel does not turn
smoothly, have a Yamaha dealer
check the wheel bearings.
UB4B82E0.book Page 27 Wednesday, March 11, 2020 1:10 PM

Periodic maintenance an d a djustment
7-28
7
EAU75190
Supportin g the motorcycle
Since this model is not equipped with a
centerstand, use a maintenance stand
when removing the front or rear wheel,
adjusting the chain or washing the ve-
hicle, etc.
Check that the motorcycle is in a stable
and level position before starting any
maintenance.
TIP
If a suitable maintenance stand is not
available, a strong wooden box can be
used instead.
EAU24361
Front wheel
EAU56372
To remove the front wheel
WARNING
EWA10822
To avoi d injury, securely support the
vehicle so there is no dan ger of it
fallin g over.
1. Loosen the axle nut.
2. Place the motorcycle on a suitable
stand. (See page 7-28.)
3. Remove the axle nut and washer.
4. Pull out the wheel axle.1. Maintenance stand (for off-road motorcycle)
1
1. Washer
2. Axle nut
1. Wheel axle
2
1
1
UB4B82E0.book Page 28 Wednesday, March 11, 2020 1:10 PM

Periodic maintenance an d a djustment
7-29
7
5. Remove the wheel.
NOTICE: Do
not apply the brake after the
wheel an d b rake disc have been
remove d, otherwise the brake
pa ds will b e forced shut.
[ECA11073]
To install the front wheel
1. Make sure the brake pads have not been forced shut.
2. Lift up the wheel between the fork legs.
3. Insert the wheel axle from the right side.
4. Install the washer and axle nut.
5. Tighten the axle nut to the speci- fied torque.
EAU25081
Rear wheel
EAU84051
To remove the rear wheel
WARNING
EWA10822
To avoi d injury, securely support the
vehicle so there is no dan ger of it
fallin g over.
1. Loosen the axle nut.
2. Place the motorcycle on a suitable
stand. (See page 7-28.)
3. Loosen the locknut, and then turn the drive chain slack adjusting bolt
in direction (a). Repeat for the oth-
er side.
Tightening torque:
Axle nut: 70 N·m (7.0 kgf·m, 52 lb·ft)
1. Axle nut
2. Washer
1. Drive chain slack adjusting bolt
2. Locknut
3. Drive chain puller
12
23
(a)1
UB4B82E0.book Page 29 Wednesday, March 11, 2020 1:10 PM

Periodic maintenance an d a djustment
7-30
7 4. Remove the axle nut and washer.
5. Push the wheel forward and re-
move the drive chain from the rear
sprocket.
6. While supporting the brake caliper bracket, pull out the wheel axle.
TIP
A rubber mallet may be useful to
tap the wheel axle out.
 The drive chain pullers may fall out
when removing the wheel axle.
7. Remove the wheel. NOTICE: Do
not apply the b rake after the
wheel an d b rake disc have been
remove d, otherwise the brake
pa ds will be forced shut.
[ECA11073]
TIP
If the drive chain is difficult to re-
move, remove the wheel axle first.
 For easy installation, rest the drive
chain on top of the swingarm.
To install the rear wheel
1. Make sure the brake pads have not been forced shut.
2. Install the wheel, the brake caliper bracket and drive chain pullers by
inserting the wheel axle from the
left side.
TIP
Make sure the slot in the brake caliper
bracket is fit over the retainer on the
swingarm.
3. Install the drive chain onto the rearsprocket.
4. Install the washer and axle nut.
5. Adjust the drive chain slack. (See page 7-21.)
1. Wheel axle
1
1. Retainer
2. Slot
2 1
UB4B82E0.book Page 30 Wednesday, March 11, 2020 1:10 PM

Periodic maintenance an d a djustment
7-31
7
EAU25872
Trou bleshootin g
Although Yamaha motorcycles receive
a thorough inspection before shipment
from the factory, trouble may occur
during operation. Any problem in the
fuel, compression, or ignition systems,
for example, can cause poor starting
and loss of power.
The following troubleshooting charts
represent quick and easy procedures
for checking these vital systems your-
self. However, should your motorcycle
require any repair, take it to a Yamaha
dealer, whose skilled technicians have
the necessary tools, experience, and
know-how to service the motorcycle
properly.
Use only genuine Yamaha replace-
ment parts. Imitation parts may look
like Yamaha parts, but they are often
inferior, have a shorter service life and
can lead to expensive repair bills.
WARNING
EWA15142
When checkin g the fuel system, d o
not smoke, an d make sure there are
no open flames or sparks in the ar-
ea, inclu din g pilot li ghts from water
heaters or furnaces. Gasoline or
g asoline vapors can i gnite or ex-
plo de, causin g severe injury or prop-
erty damag e.
UB4B82E0.book Page 31 Wednesday, March 11, 2020 1:10 PM

Periodic maintenance an d a djustment
7-32
7
EAU86410
Trou bleshootin g chart
1. FuelThere is enough fuel.
There is no fuel.
Check the ignition.
Supply fuel.The engine does not
start.
Check the ignition.
Open the throttle
halfway and try
starting the engine.
Wipe off with a dry
cloth and correct the
spark plug gap, or
replace the spark
plug(s).
2. IgnitionWet
Dry
There is compression.
There is no
compression.
The engine does not start.
Have a Yamaha dealer check the vehicle.
Have a Yamaha dealer check the vehicle.
The engine does not
start.
Check the
compression.Have a Yamaha
dealer check the
vehicle.
Remove the spark
plug and check
the electrodes.
Try starting the
engine.
Check the fuel level
in the fuel tank.
3. Compression
UB4B82E0.book Page 32 Wednesday, March 11, 2020 1:10 PM

Periodic maintenance an d a djustment
7-33
7
EAU86430En gine overheatin g
WARNING
EWAT1041
Do not remove the rad iator cap when the engine an d ra diator are hot.
Scal din g hot flui d an d steam may b e blown out un der pressure, which
coul d cause serious injury. Be sure to wait until the en gine has coole d.
 Place a thick ra g, like a towel, over the rad iator cap, and then slowly ro-
tate the cap counterclockwise to the d etent to allow any residual pres-
sure to escape. When the hissin g soun d has stopped , press down on the
cap while turnin g it counterclockwise, an d then remove the cap.
TIP
If coolant is not available, tap water can be temporarily used instead, provided
that it is changed to the recommended coolant as soon as possible.
Wait until the engine
has cooled.
Check the coolant
level in the reservoir
and radiator.Add coolant.
(See TIP.)
The coolant level is
OK.
There is no leakage.
There is leakage.
The coolant level is
low.
Check the cooling
system for leakage.
Have a Yamaha
dealer check and
repair the cooling
system.
Start the engine. If the engine overheats again,
have a Yamaha dealer check and repair the cooling
system.
UB4B82E0.book Page 33 Wednesday, March 11, 2020 1:10 PM

Motorcycle care and stora ge
8-5
8 ground. If maintenance stands are
not available, turn the wheels a lit-
tle once a month in order to pre-
vent the tires from becoming
degraded in one spot.
10. Cover the muffler outlet with a plastic bag to prevent moisture
from entering it.
11. For vehicles with a battery: Re- move and fully charge it, or attach
a maintenance charger. NOTICE:
Confirm that the b attery and its
char ger are compati ble. Do not
char ge a VRLA battery with a
conventional char ger.
[ECA26330]
UB4B82E0.book Page 5 Wednesday, March 11, 2020 1:10 PM