2008 YAMAHA YFM80R light

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CROSSING A SLOPE
Traversing a sloping surface on your ATV requires
you to properly position your weight to maintain
proper balance. Be sure that you have learned the
basic riding skills on flat ground before attempting
to cross a sloping surface. Avoid slopes with slip-
pery surfaces or rough terrain that may upset your
balance.
As you travel across a slope, lean your body in the
uphill direction. It may be necessary to correct the
steering when riding on loose surfaces by pointing
the front wheels slightly uphill. When riding onslopes, be sure not to make sharp turns either up
or down hill.
If your ATV does begin to tip over, gradually steer
in the downhill direction if there are no obstacles in
your path. As you regain proper balance, gradually
steer again in the direction you wish to travel.
WARNING

EWB01631
Never attempt to turn the ATV around on any
hill until you have mastered the turning tech-
nique as described in the Owner’s Manual on
level ground. Be very careful when turning on
any hill. Avoid crossing the side of a steep hill
if possible.
When crossing the side of a hill:

Always follow proper procedures as de-
scribed in the Owner’s Manual.

Avoid hills with excessively slippery or loose
surfaces.

Shift your weight to the uphill side of the
ATV.
OK

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EBU23211
Checking the spark plug
The spark plug is an important engine component,
which is easy to check. Since heat and deposits
will cause any spark plug to slowly erode, the spark
plug should be removed and checked in accor-
dance with the periodic maintenance and lubrica-
tion chart. In addition, the condition of the spark
plug can reveal the condition of the engine.
To remove the spark plug
1. Remove the spark plug cap.
2. Remove the spark plug as shown, with thespark plug wrench included in the owner’s tool
kit.
To check the spark plug
1. Check that the porcelain insulator around the
center electrode of the spark plug is a medi-
um-to-light tan (the ideal color when the ATV
is ridden normally).NOTE:

If the spark plug shows a distinctly different color,
the engine could be operating improperly. Do not
attempt to diagnose such problems yourself. In-
stead, have a Yamaha dealer check the ATV.
1. Spark plug cap
1

1. Spark plug wrench
1

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EBU23850
Removing the air intake restrictor plate
To obtain full engine performance capability, re-
moving the air intake restrictor plate is required.
1. Remove the air filter element. (See
page 8-13.)
2. Remove the air intake restrictor plate.
NOTE:

Store the air intake restrictor plate with the owner’s
manual so that it is readily available whenever you
want to reduce the top speed.
3. Install the air filter element.
EBU27630
Cleaning the spark arrester
Be sure the exhaust pipe and muffler are cool be-
fore cleaning the spark arrester.
1. Remove the screws.
2. Remove the tailpipe by pulling it out of the
muffler.
3. Tap the tailpipe lightly, and then use a wire
brush to remove any carbon deposits from the
spark arrester portion of the tailpipe and inside
of the tailpipe housing.
1. Air intake restrictor plate
1

1. Screw
1

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WARNING

EWB02280
Do not smoke when checking the fuel system.
Fuel can ignite or explode, causing severe inju-
ry or property damage. Make sure there are no
open flames or sparks in the area, including pi-
lot lights from water heaters or furnaces.

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Wheel travel:
57 mm (2.3 in)
Rear suspension:
Type:
Swingarm
Spring/shock absorber type:
Coil spring/oil damper
Wheel travel:
56 mm (2.2 in)
Electrical system:
Ignition system:
CDI
Charging system:
AC magneto
Battery:
Model:
12N7D-3B
Voltage, capacity:
12 V, 7.0 Ah
Bulb voltage, wattage x quantity:
Neutral indicator light:
12 V, 1.7 W
×
1
Fuses:
Main fuse:
5.0 A

INDEX
A
Accessories and loading ................................................ 6-7
Air filter element, cleaning ............................................ 8-13
Air intake restrictor plate, removing.............................. 8-17
B
Battery .................................................................. 5-6
,
8-29
Brake and shift pedals, checking and lubricating ......... 8-28
Brake lever and brake pedal free play (rear),
adjusting..................................................................... 8-23
Brake lever free play, adjusting the front...................... 8-21
Brake lever, front ............................................................ 4-4
Brake levers, checking and lubricating......................... 8-27
Brake pedal and rear brake lever ................................... 4-5
Brakes, front and rear .................................................... 5-3
Brake shoes, checking the front and rear .................... 8-20
C
Cables, checking and lubricating ................................. 8-26
Carburetor, adjusting.................................................... 8-18
Chassis fasteners........................................................... 5-6
Choke ........................................................................... 4-10
Cleaning ......................................................................... 9-1
Clutch free play, adjusting ............................................ 8-26
E
Engine break-in .............................................................. 6-5
Engine, cold start ........................................................... 6-1
Engine idling speed ...................................................... 8-18Engine oil ............................................................... 5-3
,
8-9
Engine, starting a warm ................................................. 6-3
Engine stop switch ......................................................... 4-2
F
Final gear oil......................................................... 5-3
,
8-12
Front knuckle pivots, lubricating ................................... 8-28
Fuel ........................................................................ 4-7
,
5-3
Fuel cock ........................................................................ 4-8
Fuel tank cap.................................................................. 4-7
Fuse, replacing............................................................. 8-31
H
Handlebar switches ........................................................ 4-2
I
Identification numbers .................................................. 11-1
Indicator light .................................................................. 4-1
Instruments, lights and switches .................................... 5-6
K
Key identification number ............................................. 11-1
L
Label locations ............................................................... 2-1
M
Main switch .................................................................... 4-1
Maintenance and lubrication chart ................................. 8-5
Maintenance chart, emission control system ................. 8-3
Model label ................................................................... 11-2

N
Neutral indicator light ..................................................... 4-1
O
Owner’s manual and tool kit ........................................... 8-1
P
Parking ........................................................................... 6-5
Parking brake ................................................................. 4-6
Parking on a slope ......................................................... 6-6
Part locations ................................................................. 3-1
Pre-operation check list.................................................. 5-1
R
Riding your ATV ............................................................. 7-1
S
Safety information .......................................................... 1-1
Seat .............................................................................. 4-10
Shifting ........................................................................... 6-3
Shift pedal ...................................................................... 4-6
Spark arrester, cleaning ............................................... 8-17
Spark plug, checking ...................................................... 8-8
Specifications ............................................................... 10-1
Speed limiter and air intake restrictor plate .................... 4-3
Start switch..................................................................... 4-2
Steering shaft, lubricating............................................. 8-28
Storage........................................................................... 9-2
T
Throttle cable free play, checking ................................ 8-19
Throttle lever .......................................................... 4-2
,
5-4
Timing chain ................................................................. 8-20
Tire pressure, measuring ............................................... 5-5
Tires ............................................................................... 5-4
Tire wear limit ................................................................. 5-6Troubleshooting ........................................................... 8-33
Troubleshooting chart .................................................. 8-35
V
Valve clearance............................................................ 8-20
Vehicle identification number ....................................... 11-1
W
Wheel hub bearings, checking ..................................... 8-28
Wheel, installing ........................................................... 8-33
Wheel, removing .......................................................... 8-32