2008 YAMAHA YFM80R Owners Manual

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Rear brake

Check operation, and correct if necessary.

Lubricate cable if necessary.

Check lever and pedal free play, and adjust if necessary.5-3, 8-20, 8-23
Throttle lever

Make sure that operation is smooth. Lubricate cable and lever hous-
ing if necessary.

Check cable free play, and adjust if necessary.5-4, 8-19
Control cables

Make sure that operation is smooth. Lubricate if necessary. 8-26
Wheels and tires

Check wheel condition, and replace if damaged.

Check tire condition and tread depth. Replace if necessary.

Check air pressure. Correct if necessary.5-4, 5-5, 5-6
Brake and shift pedals

Make sure that operation is smooth. Lubricate pedal pivoting points
if necessary.8-28
Brake levers

Make sure that operation is smooth. Lubricate lever pivoting points
if necessary.8-27
Chassis fasteners

Make sure that all nuts, bolts and screws are properly tightened. 5-6
Instruments and switches

Check operation, and correct if necessary. 5-6
Battery

Check electrolyte level. Fill with distilled water if necessary. 5-6, 8-29
ITEM ROUTINE PAGE

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EBU19540
Fuel
Make sure that there is sufficient fuel in the tank.
(See page 4-7.)
WARNING

EWB00520

Do not overfill the fuel tank. Fuel expands
when it heats up. If the fuel tank is overfilled,
fuel could spill out due to heat from the en-
gine or the sun.

Be careful not to spill fuel, especially on the
engine or exhaust pipe which can cause a
fire and severe injury. Wipe up any spilled
fuel immediately.

Do not refuel right after the engine has been
running and is still very hot.

Be sure the fuel tank cap is closed securely.
EBU19560
Engine oil
Make sure that the engine oil is at the specified lev-
el. Add oil as necessary. (See page 8-9.)
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Final gear oil
Make sure that the final gear oil is at the specified
level. Add oil as necessary. (See page 8-12.)
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Front and rear brakes
Brake levers and brake pedal

Check for correct free play in the brake levers
and brake pedal. If the free play is incorrect, ad-
just it. (See pages 8-21 and 8-23.)

Check operation of the brake levers and brake
pedal. They should move smoothly and there
should be a firm feeling when the brakes are ap-
plied. If not, have the ATV checked by a Yamaha
dealer.
Brake operation
Test the brakes at slow speed after starting out to
make sure they are working properly. If the brakes
do not provide proper braking performance, check
the brake linings for wear. (See page 8-20.)
WARNING

EWB00570
Always check the brakes at the start of every
ride. Do not ride the ATV if you find any prob-
lem with the brakes or you could lose braking
ability, which could lead to an accident. If a
problem cannot be corrected by the adjust-
ment procedures provided in this manual, have

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the ATV checked by a Yamaha dealer.
EBU19761
Throttle lever
Check the operation of the throttle lever. It must
open smoothly and spring back to the idle position
when released. Have a Yamaha dealer correct if
necessary.
EBU19791
Tires
WARNING

EWB00601
Use of improper tires on this ATV, or operation
of this ATV with improper or uneven tire pres-
sure, may cause loss of control, increasing
your risk of accident.
Pay attention to the following.

The tires listed below have been approved
by Yamaha Motor Co., Ltd. for this model.
Other tire combinations are not recommend-
ed.
Front:
Manufacturer/model:
DUNLOP/KT586
Size:
AT18 x 7-7Type:
Tubeless
Rear:
Manufacturer/model:
DUNLOP/KT587
Size:
AT18 x 8-7
Type:
Tubeless

The tires should be set to the recommended
pressure:
Recommended tire pressure:
Front:
20 kPa (2.9 psi) (0.20 kgf/cm
2
)
Rear:
20 kPa (2.9 psi) (0.20 kgf/cm
2
)

Check and adjust tire pressures when the
tires are cold.

Tire pressures must be equal on both
sides.

Tire pressure below the minimum speci-
fied could cause the tire to dislodge from
the rim under severe riding conditions.
Minimum tire pressure:
Front:
17 kPa (2.5 psi) (0.17 kgf/cm
2
)

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Rear:
17 kPa (2.5 psi) (0.17 kgf/cm
2
)

Use no more than the following pressures
when seating the tire beads.
Maximum tire seating pressure:
Front:
250 kPa (36 psi) (2.5 kgf/cm
2
)
Rear:
250 kPa (36 psi) (2.5 kgf/cm
2
)
Higher pressures and fast inflation may
cause a tire to burst. Inflate the tires very
slowly and carefully.
EBU19820
Measuring the tire pressure
Use the low-pressure tire gauge.
NOTE:

The low-pressure tire gauge is included as stan-
dard equipment. Make two measurements of the
tire pressure and use the second reading. Dust or
dirt in the gauge could cause the first reading to be
incorrect.Set the tire pressure when the tires are cold. Set
the tire pressures to the following specifications:
1. Low-pressure tire gauge
1

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Tire wear limit
Replace the tire when the tire groove decreases to
3 mm (0.12 in).
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Chassis fasteners
Make sure that all nuts, bolts and screws are prop-
erly tightened.
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Instruments, lights and switches
Check that all instruments, lights and switches are
working properly. Correct if necessary.
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Battery
Check the fluid level in the battery. Fill with distilled
water if necessary. (See page 8-29.) Recommended pressure:
Front
20 kPa (2.9 psi) (0.20 kgf/cm
2
)
Rear
20 kPa (2.9 psi) (0.20 kgf/cm
2
)
Minimum:
Front
17 kPa (2.5 psi) (0.17 kgf/cm
2
)
Rear
17 kPa (2.5 psi) (0.17 kgf/cm
2
)
Maximum:
Front
23 kPa (3.3 psi) (0.23 kgf/cm
2
)
Rear
23 kPa (3.3 psi) (0.23 kgf/cm
2
)
1. Tire wear limit

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OPERATION
EBU19900
Read the Owner’s Manual carefully before riding
the ATV.
WARNING

EWB00630
Read the Owner’s Manual carefully to become
familiar with all controls in order to help pre-
vent any loss of control, which could cause an
accident or injury. If there is a control or func-
tion you do not understand, ask your Yamaha
dealer.
EBU20221
Starting a cold engine
WARNING

EWB00640
Always make sure all control cables work
smoothly before you begin riding in cold
weather. If the control cables are frozen or do
not work smoothly, you could be unable to
control the ATV, which could lead to an acci-
dent or collision.
CAUTION:

ECB00150
See the “Engine break-in” section on page 6-5
prior to operating the engine for the first time.
1. Set the parking brake.
2. Turn the fuel cock to “ON”.
3. Turn the main switch to “ON” and the engine
stop switch to “RUN”.
4. Shift the transmission into neutral. The neutral
indicator light should come on. If the indicator
light does not come on, have a Yamaha deal-
er check the electrical circuit.
NOTE:

This model is equipped with an ignition circuit cut-
off system. The engine can be started under the
following conditions.

The transmission is in neutral.

The rear brake lever is applied with the transmis-
sion in any gear. However, it is recommended to
shift into neutral before starting the engine.
5. Use the choke in reference to the figure:

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Position (1):

Cold engine start with ambient temperature be-
low 30 °C (90 °F).
Position (2):

Warming up position.
Position (3):

Cold engine start with ambient temperature
above 25 °C (80 °F).
Ambient temp./choke position
6. Completely close the throttle lever and start
the engine by pushing the start switch.
NOTE:

If the engine fails to start, release the start switch,
then push it again. Pause a few seconds before
the next attempt. Each cranking should be as short
as possible to preserve battery energy. Do not
1. Fully open “ON”
2. Half open (warming up position)
3. Closed “OFF”
4. Choke
ON
OFF
0°
30°10°20°30°
50°70°90°°F °C
4 1
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2

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crank the engine more than 10 seconds on each
attempt.
7. If the engine is started with the choke in posi-
tion (1), the choke should be returned to posi-
tion (2) to warm up the engine. If the engine is
started with the choke in position (2), keep the
choke in this position to warm up the engine.
CAUTION:

ECB00160
For maximum engine life, always warm the en-
gine up before starting off. Never accelerate
hard when the engine is cold!
8. Continue warming up the engine until it idles
smoothly, then return the choke to position (3)
before riding.
NOTE:

The engine is warm when it responds normally to
the throttle with the choke turned off.
EBU20301
Starting a warm engine
Follow the same procedure as for starting a cold
engine, with the exception that the choke is not re-
quired when the engine is warm. Instead, start the
engine with the throttle slightly open.
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Shifting
This ATV has a 3-speed forward transmission with
a centrifugal, automatic clutch. The transmission
allows you to control the amount of power you
have available at a given speed or for starting ac-
celerating, climbing, etc.
To shift into neutral, return the throttle lever to the
closed position and repeatedly depress the shift
pedal until it stops.
EBU20610
To start out and accelerate
1. Release the throttle lever.
1. Shift pedal
2. Neutral position
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