2009 YAMAHA WOLVERINE 350 light

8-9
8plug 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 the
spark 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).
TIPIf 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.
2. Check the spark plug for electrode erosion
and excessive carbon or other deposits, and
replace it if necessary.
1. Spark plug cap
1. Spark plug wrench
U3D563E0.book Page 9 Monday, May 12, 2008 11:12 AM

8-21
8will affect carburetor jetting with subsequent
poor performance and possible engine over-
heating.EBU27011Cleaning the spark arrester Be sure the exhaust pipe and muffler are cool be-
fore cleaning the spark arrester.
1. Remove the tailpipe cover by removing the
bolts.
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. Insert the tailpipe into the muffler and align the
bolt holes.
5. Install the tailpipe cover by installing the bolts,
and then tighten them to the specified torque.1. Bolt
2. Tailpipe cover
1. Tailpipe
2. Spark arresterTightening torque:
Tailpipe bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
U3D563E0.book Page 21 Monday, May 12, 2008 11:12 AM

8-32
8
EBU24230Axle boots The axle boots must be checked for damage at the
intervals specified in the periodic maintenance and
lubrication chart. Check the axle boots for tears or
damage. If any damage is found, have them re-
placed by a Yamaha dealer.EBU24752Brake 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.
1. Remove panel A. (See page 8-8.)TIPThe brake light switch is properly adjusted when
the brake light comes on just before braking takeseffect.
2. Turn the brake light switch adjusting nut while
holding the brake light switch in place. To
make the brake light come on earlier, turn theadjusting nut in direction (a). To make the
brake light come on later, turn the adjusting
nut in direction (b).
3. Install the panel.
EBU24900Checking and lubricating the cables The operation and the condition of all control ca-
bles should be checked before each ride, and the
cables and cable ends should be lubricated if nec-
essary. If a cable is damaged or does not move
smoothly, have a Yamaha dealer check or replace
it.1. Brake light switch
2. Brake light switch adjusting nut
U3D563E0.book Page 32 Monday, May 12, 2008 11:12 AM

8-37
8the battery. If you do not have access to a
constant-voltage battery charger, have a
Yamaha dealer charge your battery.EBU25324Replacing a fuse
The main fuse and the fuse box are located under
the seat. (See page 4-11.)
If a fuse is blown, replace it as follows.
1. Turn the key to “OFF” and turn off all electrical
circuits.NOTICEECB00640To prevent accidental short-circuiting, turn off
the main switch when checking or replacing afuse.
1. Main fuse
2. Spare main fuse
3. Fuse box
1. Headlight fuse
2. Ignition fuse
3. Signaling system fuse
4. Spare fuse
U3D563E0.book Page 37 Monday, May 12, 2008 11:12 AM

8-38
8 2. Remove the blown fuse, and then install a
new fuse of the specified amperage.
WARNING
EWB02171Always use a fuse of the specified rating, and
never use a substitute object in place of the
proper fuse. An improper fuse or a substitute
object can cause damage to the electrical sys-tem, which could lead to a fire.
3. Turn the key to “ON” and turn on the electrical
circuits to check if the devices operate.
4. If the fuse immediately blows again, have a
Yamaha dealer check the electrical system.
EBU25541Replacing a headlight bulb If a headlight bulb burns out, replace it as follows.
1. Remove the headlight bulb holder cover at the
rear of the headlight by pulling it off.
2. Remove the headlight bulb holder by pushing
it inward and turning it counterclockwise. Specified fuses:
Main fuse:
20.0 A
Headlight fuse:
15.0 A
Ignition fuse:
15.0 A
Signaling system fuse:
10.0 A1. Headlight bulb holder cover
U3D563E0.book Page 38 Monday, May 12, 2008 11:12 AM

8-39
83. Remove the defective bulb from the headlight
unit by pulling it out.
WARNING
EWB02220A 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 touch-es something flammable.
4. Install a new headlight bulb into the headlight
unit by aligning the projection on the bulb with
the groove in the headlight unit.
NOTICEECB00650Do 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 clothmoistened with alcohol or thinner.
5. Install the headlight bulb holder by aligning the
projections with the holes in the headlight unit,
pushing it inward, and turning it clockwise until
it stops.
1. Headlight bulb holder
1. Do not touch the glass part of the bulb.
U3D563E0.book Page 39 Monday, May 12, 2008 11:12 AM

8-40
8 6. Install the headlight bulb holder cover at the
rear of the headlight.
NOTICEECB00670Make sure the headlight bulb holder cover is
securely fitted over the bulb holder and seatedproperly.
7. Adjust the headlight beam if necessary.EBU25560Adjusting a headlight beam NOTICEECB00690It is advisable to have a Yamaha dealer makethis adjustment.To raise a headlight beam, turn the adjusting bolt
in direction (a).
To lower a headlight beam, turn the adjusting bolt
in direction (b).
EBU25600Replacing the tail/brake light bulb If the tail/brake light bulb burns out, replace it as
follows.
1. Remove the lens by removing the screws.1. Headlight beam adjusting bolt
U3D563E0.book Page 40 Monday, May 12, 2008 11:12 AM

8-41
82. Remove the defective bulb by pushing it in
and turning it counterclockwise.3. Insert a new bulb into the socket, push it in,
and then turn it clockwise until it stops.
4. Install the lens by installing the screws.
NOTICEECB00700Do not overtighten the screws, otherwise thelens may break.EBU25651Removing a wheel 1. Place the ATV on a level surface.
2. Loosen the wheel nuts.
3. Elevate the ATV and place a suitable stand
under the frame.
1. Screw
1. Tail/brake light bulb
1. Wheel nut
U3D563E0.book Page 41 Monday, May 12, 2008 11:12 AM