
8-41
86. Wash the sponge material gently, but thor-
oughly, in solvent.  WARNING! Always use
parts cleaning solvent to clean the sponge
material. Never use low-flash-point sol-
vents or gasoline to clean the sponge ma-
terial because the engine could catch fire
or explode.
 [EWB01942]
7. Squeeze the excess solvent out of the sponge material and let it dry.  NOTICE: Do
not twist the sponge material when
squeezing it.
 [ECB00442]
8. Check the sponge material and replace it if damaged.
9. Apply Yamaha foam air filter oil or other qual- ity foam air filter oil to the sponge material.
TIPThe sponge material should be wet but not drip-
ping. 10. Install the mesh and the sponge material into the air filter case.  NOTICE: Make sure that
the air filter element is properly seated in
the air filter case. Never operate the en-
gine with the air filter element removed.
Doing so would allow unfiltered air to enter
the engine, causing rapid engine wear and
possible engine damage. Additionally, the
fuel injection system would be affected re-
sulting in poor engine performance and
possible overheating.
 [ECB00763]
11. Insert the projections on the air filter case cover into the holders on the air filter case,
and then install the air filter case cover by
hooking the holders onto the cover.
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8-42
8
12. Place the hoses in their original position as
shown. 13. Install the panel.
TIPThe air filter element should be cleaned every 20–
40 hours. It should be cleaned and lubricated
more often if the ATV is operated in extremely
dusty areas. Each time the air filter element main-
tenance is performed, check the air inlet of the air
filter case for obstructions. Check the air filter
case rubber joint to the throttle body and the rub-
ber joint manifold fittings for an air-tight seal.
Tighten all fittings securely to avoid the possibility
of unfiltered air entering the engine. EBU28904Cleaning the spark arresterBe sure the exhaust pipe and muffler are cool be-
fore cleaning the spark arrester.
1. Remove the tailpipe bolts.
1. Air filter case cover
1. Hose
1
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8-44
8
WARNING
EWB02341Do not start the engine when cleaning the
spark arrester, otherwise it could cause injury
to the eyes, burns, carbon monoxide poison-
ing, possibly leading to death, and start a fire.
Always let the exhaust system cool prior to
touching exhaust components. EBU23932V-belt case drain plugAfter riding in water deep enough to allow it to en-
ter the V-belt case, remove the V-belt case drain
plug to drain the water from the case.TIPIf water drains from the V-belt case after removing
the plug, have a Yamaha dealer check the ATV as
the water may affect other engine parts. 
EBU29703Adjusting the throttle lever free playThe throttle lever free play should be checked and,
if necessary, adjusted at the intervals specified in
the periodic maintenance and lubrication chart.
The throttle lever free play should measure 3.0–5.0
mm (0.12–0.20 in) as shown. Periodically check
the throttle lever free play and, if necessary, adjust
it as follows.1. Slide the rubber cover back.
2. Loosen the locknut.1. V-belt case drain plug
UB3860E0.book  Page 44  Monday, July 14, 2014  10:34 AM 

8-45
83. To increase the throttle lever free play, turn
the throttle lever free play adjusting bolt in di-
rection (a). To decrease the throttle lever free
play, turn the adjusting bolt in direction (b).
4. Tighten the locknut.
5. Slide the rubber cover to its original position.
EBU24061Valve clearanceThe valve clearance changes with use, resulting in
improper air-fuel mixture and/or engine noise. To
prevent this from occurring, the valve clearance must be adjusted by a Yamaha dealer at the inter-
vals specified in the periodic maintenance and lu-
brication chart.
EBU24072Adjusting the drive select lever safety 
system cableThe drive select lever safety system cable stretch-
es with use, which can result in improper function.
Therefore, the safety system cable should be
checked and adjusted by a Yamaha dealer at the
intervals specified in the periodic maintenance
and lubrication chart.EBU29602BrakesReplacement of brake components requires pro-
fessional knowledge. Brake service should be
performed by a Yamaha dealer.
WARNING
EWB02572Operating with improperly serviced or adjust-
ed brakes could lead to a loss in braking ability
and an accident. 
1. Rubber cover
2. Throttle lever free play adjusting bolt
3. Locknut
4. Throttle lever free play
2WD
4WD
3
2
1
4
(b)
(a)
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8-66
8
EBU27695Troubleshooting chartsStarting problems or poor engine performance
Check the fuel level in
the fuel tank.1. Fuel
There is enough fuel.There is no fuel.
Check the battery.
Supply fuel.
The engine does not start. 
Check the battery.
Operate the electric starter.4. Compression
There is compression.
There is no compression.
The engine does not start.
Have a Yamaha dealer check the ATV.
Remove the spark plug
and check the electrodes.3. Ignition
Wipe off with a dry cloth and correct the
spark plug gap, or replace the spark plug. Have a Yamaha dealer check the ATV.
The engine does not start.
Check the compression.
DryWet
Operate the electric starter.
Have a Yamaha dealer check the ATV.
The engine does not start.
Check the ignition.
Operate the electric starter.2. Battery
The engine turns over  
quickly.
The engine turns over  
slowly.
The battery is good.Check the battery lead connections,
and have a Yamaha dealer charge 
the battery if necessary.
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8-67
8Engine overheating
WARNING
EWB02291Wait for the engine and radiator to cool before removing the radiator cap. You could be burned by
hot fluid and steam blown out under pressure. Always put a thick rag over the cap when opening.
Allow any remaining pressure to escape before completely removing the cap. TIPIf 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.
The coolant level 
is OK.The coolant level is low.
Check the cooling system
for leakage.
Have a Yamaha dealer check
and repair the cooling system.Add coolant. (See TIP.)
Start the engine. If the engine overheats again, have a 
Yamaha dealer check and repair the cooling system.
There is
leakage.
There is 
no leakage.
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9-2
9
EBU27262StorageShort-term
Always store your ATV in a cool, dry place and, if
necessary, protect it against dust with a porous
cover. NOTICE:  Storing the ATV in a poorly ven-
tilated room or covering it with a tarp while it is
still wet, will allow water and humidity to seep
in and cause rust. To prevent corrosion, avoid
damp cellars, stables (because of the presence
of ammonia) and areas where strong chemi-
cals are stored.
 [ECB00722]
Long-term
Before storing your ATV for several months: 1. Follow all the instructions in the “Cleaning” section of this chapter.
2. Fill up the fuel tank and add fuel stabilizer (if available) to prevent the fuel from deteriorat-
ing. 3. Perform the following steps to protect the cyl-
inder, piston rings, etc. from corrosion.a. Remove the spark plug cap and spark plug.
b. Pour a teaspoonful of engine oil into the spark plug bore.
c. Install the spark plug cap onto the spark plug, and then place the spark plug on the
cylinder head so that the electrodes are
grounded. (This will limit sparking during
the next step.)
d. Turn the engine over several times with the starter. (This will coat the cylinder wall
with oil.)
e. Remove the spark plug cap from the spark plug, and then install the spark plug and
the spark plug cap.
4. Lubricate all control cables and the pivoting points of all levers and pedals.
5. Check and, if necessary, correct the tire air pressure, and then block up the ATV so that
all of its wheels are off the ground. Alterna-
tively, turn the wheels a little every month in
order to prevent the tires from becoming de-
graded in one spot.
Specified amount:
7.5 ml of stabilizer to each liter of fuel (or 1 
oz of stabilizer to each gallon of fuel)UB3860E0.book  Page 2  Monday, July 14, 2014  10:34 AM 

12-1
12
INDEX
AAccessories and loading  ................................................ 6-6
Accessories, auxiliary jack  ........................................... 4-23
Air filter element, cleaning ............................................ 8-39
Axle boots  .................................................................... 8-51BBattery .......................................................................... 8-55
Brake fluid, changing  ...................................................8-48
Brake fluid level, checking  ........................................... 8-47
Brake lever, front .......................................................... 4-14
Brake levers, checking and lubricating  ........................ 8-52
Brake pads, checking the front and rear  ..................... 8-46
Brake pedal and rear brake lever  ................................. 4-14
Brake pedal, checking and lubricating  ........................ 8-53
Brake pedal free play, adjusting  .................................. 8-49
Brakes .......................................................................... 8-45
Brakes, front and rear  .................................................... 5-3CCables, checking and lubricating ................................. 8-52
Carrier, front  ................................................................. 4-21
Carrier, rear  .................................................................. 4-21
Chassis fasteners  ........................................................... 5-7
Cleaning ......................................................................... 9-1
Coolant ................................................................. 5-3, 8-31
Coolant temperature warning light ................................. 4-3DDifferential gear oil  ............................................... 5-3, 8-29
Drive select lever  .......................................................... 4-15
Drive select lever and driving in reverse  ........................ 6-2Drive select lever safety system cable, adjusting  ........ 8-45
EEngine break-in  .............................................................. 6-4
Engine oil  ....................................................................... 5-3
Engine oil and oil filter cartridge  .................................. 8-22
Engine stop switch ......................................................... 4-8
Engine trouble warning light  .......................................... 4-3
EPS warning light  ........................................................... 4-3FFinal gear oil  ......................................................... 5-3, 8-26
Four-wheel-drive/differential gear lock indicator  ........... 4-4
Front and rear brake lever free play, checking  ............ 8-48
Fuel ...................................................................... 4-16, 5-3
Fuel tank cap  ............................................................... 4-15
Fuses, replacing  ........................................................... 8-59HHandlebar switches  ....................................................... 4-7
Headlight beam, adjusting  ........................................... 8-62
Headlight bulb, replacing  ............................................. 8-61
High-range indicator light  .............................................. 4-2
Horn switch  .................................................................... 4-8IIdentification numbers  ................................................. 11-1
Indicator lights and warning lights  ................................. 4-2
Instruments, lights and switches  ................................... 5-7LLabel locations  ............................................................... 1-1
Light switch  .................................................................... 4-8
Low-range indicator light  ............................................... 4-2
UB3860E0.book  Page 1  Monday, July 14, 2014  10:34 AM