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The service information included in this manual
and the tools provided in the owner’s tool kit are in-
tended to assist you in the performance of preven-
tive maintenance and minor repairs. However,
additional tools such as a torque wrench may be
necessary to perform certain maintenance work
correctly.
NOTE:
If you do not have the tools or experience required
for a particular job, have a Yamaha dealer perform
it for you.
WARNING
EWB01850
Never modify this ATV through improper in-
stallation or use of accessories, as it may
cause changes in handling, which in some sit-
uations could lead to an accident. All parts and
accessories added to this ATV should be gen-
uine Yamaha or equivalent components de-
signed for use on this ATV and should be
installed and used according to instructions. If
you have questions, consult an authorized
Yamaha ATV dealer.
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EBU22403
Periodic maintenance and lubrication chart
NOTE:
For ATVs not equipped with an odometer or an hour meter, follow the month maintenance intervals.
For ATVs equipped with an odometer or an hour meter, follow the km (mi) or hours maintenance inter-
vals. However, keep in mind that if the ATV isn’t used for a long period of time, the month maintenance
intervals should be followed.
Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools,
data and technical skills.
NO. ITEMCHECK OR MAINTENANCE
JOBINITIAL EVERY
Whichev-
er comes
firstmonth136612
km
(mi)320
(200)1200
(750)2400
(1500)2400
(1500)4800
(3000)
hours 20 75 150 150 3001
*
Fuel line
Check fuel hoses for cracks or other damage, and
replace if necessary.
√√√
2 Spark plug
Check condition and clean, regap, or replace if
necessary.
√√√√√
3
*
Valves
Check valve clearance and adjust if necessary.
√ √√√
4
*
Timing chain
Check chain tension.
Adjust if necessary.
√ √√√
5 Air filter element
Clean and replace if necessary.Every 20–40 hours (more often in wet or
dusty areas)
6
*
Front brake
Check operation and correct if necessary.
Check brake lever free play and adjust if neces-
sary.
√√√√√
Replace brake shoes. Whenever worn to the limit
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7
*
Rear brake
Check operation and correct if necessary.
Check brake lever free play and adjust if neces-
sary.
√√√√√
Replace brake shoes. Whenever worn to the limit
8
*
Wheels
Check runout and for damage, and replace if nec-
essary.
√ √√√
9
*
Tires
Check tread depth and for damage, and replace if
necessary.
Check air pressure and balance, and correct if
necessary.
√ √√√
10
*
Wheel bearings
Check for looseness or damage, and replace if
necessary.
√ √√√
11
*
Drive shaft univer-
sal joint
Lubricate with lithium-soap-based grease.
√√√
12
*
Chassis fasteners
Make sure that all nuts, bolts, and screws are
properly tightened.
√√√√√
13
*
Shock absorber
assemblies
Check operation and correct if necessary.
Check for oil leakage and replace if necessary.
√√√
14
*
Knuckle shafts
Lubricate with lithium-soap-based grease.
√√√
15
*
Steering shaft
Lubricate with lithium-soap-based grease.
√√√
16
*
Steering system
Check operation and repair or replace if damaged.
Check toe-in and adjust if necessary.
√√√√√
17
*
Carburetor
Check choke operation and correct if necessary.
Check engine idling speed and adjust if neces-
sary.
√√√√
NO. ITEMCHECK OR MAINTENANCE
JOBINITIAL EVERY
Whichev-
er comes
firstmonth 1 3 6 6 12
km
(mi)320
(200)1200
(750)2400
(1500)2400
(1500)4800
(3000)
hours 20 75 150 150 300
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18
*
Crankcase breather
system
Check breather hose for cracks or other damage,
and replace if necessary.
√√√
19 Engine oil
Change.
Check ATV for oil leakage, and correct if neces-
sary.
√ √√√
20 Final gear oil
Change.
Check ATV for oil leakage, and correct if neces-
sary.
√√
21
*
Moving parts and
cables
Lubricate.
√√√√
22
*
Throttle lever hous-
ing and cable
Check operation and correct if necessary.
Check throttle cable free play and adjust if neces-
sary.
Lubricate throttle lever housing and cable.
√√√√√
23
*
Exhaust system
Check for leakage and replace gasket(s) if neces-
sary.
Check for looseness and tighten all screw clamps
and joints if necessary.
√√√
24 Spark arrester
Clean.
√√√
25
*
Front and rear brake
switches
Check operation and correct if necessary.
√√√√√
26
*
Battery
Check electrolyte level and specific gravity, and
correct if necessary.
Make sure that the breather hose is properly
routed.
√√√√√
NO. ITEMCHECK OR MAINTENANCE
JOBINITIAL EVERY
Whichev-
er comes
firstmonth136612
km
(mi)320
(200)1200
(750)2400
(1500)2400
(1500)4800
(3000)
hours 20 75 150 150 300
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EBU23060
NOTE:
The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
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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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2. Check the spark plug for electrode erosion
and excessive carbon or other deposits, and
replace it if necessary.
To install the spark plug
1. Measure the spark plug gap with a wire thick-
ness gauge and, if necessary, adjust the gap
to specification.2. Clean the surface of the spark plug gasket
and its mating surface, and then wipe off any
grime from the spark plug threads.
3. Install the spark plug with the spark plug
wrench, and then tighten it to the specified
torque.NOTE:
If a torque wrench is not available when installing
a spark plug, a good estimate of the correct torque
is 1/4–1/2 turn past finger tight. However, the spark
plug should be tightened to the specified torque as
soon as possible.
4. Install the spark plug cap.
EBU23251
Engine oil
The engine oil level should be checked before
each ride. In addition, the oil must be changed at
the intervals specified in the periodic maintenance
and lubrication chart. Specified spark plug:
NGK/CR7HSA
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
1. Spark plug gap
Tightening torque:
Spark plug:
12.5 Nm (1.25 m·kgf, 9.0 ft·lbf)
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To check the engine oil level
1. Place the ATV on a level surface.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Wait a few minutes until the oil settles before
checking.
4. Remove the engine oil filler cap, and then
wipe the dipstick off with a clean rag.
5. Insert the dipstick into the filler hole (without
screwing it in), and then remove it again to
check the oil level.NOTE:
The engine oil should be between the minimum
and maximum level marks.
6. If the engine oil is at or below the minimum
level mark, add sufficient oil of the recom-
mended type to raise it to the correct level.
7. Insert the dipstick into the oil filler hole, and
then tighten the engine oil filler cap.
To change the engine oil
1. Place the ATV on a level surface.
2. Start the engine, warm it up for several min-
1. Engine oil filler cap
2. Dipstick
12
1. Maximum level mark
2. Minimum level mark
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