Page 81 of 132
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EBU23070
NOTE:
The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
Hydraulic brake service
Regularly check and, if necessary, correct the brake fluid level.
Every two years replace the internal components of the brake master cylinders and calipers, and
change the brake fluid.
Replace the brake hoses every four years and if cracked or damaged.
26 Spark arrester
Clean.
√√√
27
*
Front and rear brake
switches
Check operation and correct if necessary.
√√√√√
28
*
Lights and switches
Check operation and correct if necessary.
Adjust headlight beam.
√√√√√
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
Page 82 of 132
8-7
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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
Page 90 of 132
8-15
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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.4. Make sure the gasket is properly positioned,
then insert the tailpipe into the muffler and
align the screw holes.
5. Install the screws and tighten them.
WARNING
EWB02340
Do 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
1. Screw
1
1. Tailpipe
2. Spark arrester
3. Gasket
1
2
3
Page 104 of 132

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WARNING
EWB02090
Operating with improperly serviced or adjust-
ed brakes could cause the brakes to malfunc-
tion, resulting in reduced braking
performance. This could increase the chance
of a collision or accident. After adjusting the
parking brake free play, block the rear of the
ATV off the ground and spin the rear wheels.
Check to make sure there is no brake drag. If
brake drag is noticed, perform the adjustment
again.
EBU24740
Brake light switches
The operation of the brake light switches must be
checked and, if necessary, adjusted at the inter-
vals specified in the periodic maintenance and lu-
brication chart.
The brake light switch for the brake pedal can be
adjusted as follows, but the other brake light
switches should be adjusted by a Yamaha dealer.
NOTE:
The brake light switch is properly adjusted when
the brake light comes on just before braking takes
effect.
Turn the adjusting nut while holding the brake light
switch in place. To make the brake light come on
earlier, turn the adjusting nut in direction (a). To
make the brake light come on later, turn the adjust-
ing nut in direction (b).
EBU24810
Adjusting the clutch lever free play
The clutch lever free play must be checked and, if
necessary, adjusted at the intervals specified in
the periodic maintenance and lubrication chart.
The clutch lever free play should measure 2.0–3.0
1. Brake light switch
2. Brake light switch adjusting nut1
2 (a)
(b)
Page 111 of 132
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EBU25340
Replacing the headlight bulb
If the headlight bulb burns out, replace it as follows.
1. Remove the panel shown by removing the
screws.2. Remove the headlight beam adjusting screw,
the washer, the spring and the nut.
NOTE:
Be sure not to lose the washer, the spring and the
nut.
1. Grease nipple
1
1. Panel
2. Screw
1 2 2
Page 112 of 132
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3. Disconnect the main switch leads.4. Remove the headlight unit from the headlight
assembly by removing the screws.
1. Headlight beam adjusting screw
2. Washer
3. Spring
4. Nut
1 2
3 4
1. Main switch lead
1
Page 113 of 132
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5. Remove the headlight bulb holder cover.
6. Remove the headlight bulb holder by turning it
counterclockwise, and then remove the defec-
tive bulb.
1. Headlight unit
2. Screw
1
21
2
1. Headlight bulb holder cover
2. Headlight bulb holder
1 2
Page 114 of 132
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WARNING
EWB02200
A headlight bulb is hot when it is on and imme-
diately after it is turned off. Wait for the bulb to
cool before touching or removing it. You can
be burned, or a fire could start if the bulb
touches something flammable.
7. Place a new bulb into position, and then install
the bulb holder by turning it clockwise.
CAUTION:
ECB00650
Do not touch the glass part of the headlight
bulb to keep it free from oil, otherwise the
transparency of the glass, the luminosity of the
bulb, and the bulb life will be adversely affect-
ed. Thoroughly clean off any dirt and finger-
prints on the headlight bulb using a cloth
moistened with alcohol or thinner.
8. Install the headlight bulb holder cover.
1. Headlight bulb holder
2. Headlight bulb
12
1. Do not touch the glass part of the bulb.1