2012 YAMAHA GRIZZLY 450 Owners Manual

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3. Remove the headlight bulb holder by pushing
it in and turning it counterclockwise. 4. Remove the burnt-out bulb by pulling it out.
5. Insert a new headlight bulb into the bulb hold-
er by pushing it in. NOTICE: 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 affected.
Thoroughly clean off any dirt and finger-
prints on the headlight bulb using a cloth
moistened with alcohol or thinner.
[ECB00651]
6. Install the bulb holder by pushing it in and turn- ing it clockwise.
1. Headlight bulb holder cover
1. Headlight bulb holder
1. Do not touch the glass part of the bulb.
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87. Install the bulb holder cover and the cover at
the rear of the headlight. NOTICE: Make sure
the headlight bulb holder cover is securely
fitted over the bulb holder and seated
properly.
[ECB00671]
8. Adjust the headlight beam if necessary.EBU25551Adjusting a headlight beam NOTICEECB00690It is advisable to have a Yamaha dealer make
this adjustment.To raise a headlight beam, turn the headlight beam
adjusting screw in direction (a).
To lower a headlight beam, turn the adjusting
screw in direction (b).
EBU25622Replacing the tail/brake light bulb If the tail/brake light bulb burns out, replace it as
follows. 1. Remove the tail/brake light assembly by re- moving the nuts together with the washers.1. Headlight beam adjusting screw
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2. Remove the tail/brake light bulb holder (to-
gether with the bulb) by turning it counter-
clockwise. 3. Remove the burnt-out bulb by pushing it in
and turning it counterclockwise.
1. Tail/brake light assembly
2. Nut
1. Tail/brake light assembly
2. Tail/brake light bulb holder
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84. Insert a new bulb into the bulb holder, push it
in, and then turn it clockwise until it stops.
5. Install the bulb holder (together with the bulb) by turning it clockwise.
6. Install the tail/brake light assembly by install- ing the washers and the nuts.
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.
4. Remove the nuts from the wheel.
5. Remove the wheel.
EBU25701Installing a wheel 1. Place the ATV on a level surface.
2. Install the wheel and the nuts.TIP
The arrow mark on the tire must point toward
the rotating direction of the wheel.
1. Tail/brake light bulb holder
2. Tail/brake light bulb
1. Wheel nut
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Tapered nuts are used for both the front and rear
wheels. Install the nuts with their tapered side to-
wards the wheel.
3. Lower the ATV to the ground.
4. Tighten the wheel nuts to the specifiedtorques.
1. Arrow mark
1
1. Tapered nutTightening torques:Front wheel nut:55 Nm (5.5 m ·kgf, 40 ft ·lbf)
Rear wheel nut: 55 Nm (5.5 m ·kgf, 40 ft ·lbf)
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EBU25740Troubleshooting Although Yamaha ATVs receive a thorough in-
spection before shipment from the factory, trouble
may occur during operation. Any problem in the fu-
el, compression, or ignition systems, for example,
can cause poor starting and loss of power.
The following troubleshooting charts represent
quick and easy procedures for checking these vital
systems yourself. However, should your ATV re-
quire any repair, take it to a Yamaha dealer, whose
skilled technicians have the necessary tools, expe-
rience, and know-how to service the ATV properly.
Use only genuine Yamaha replacement parts. Im-
itation parts may look like Yamaha parts, but they
are often inferior, have a shorter service life and
can lead to expensive repair bills.
WARNING
EWB02280Do 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.U1CT61E0.book Page 61 Wednesday, April 20, 2011 6:36 PM

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8
EBU25784Troubleshooting charts Starting 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 compression.
Supply fuel.
The engine does not start.
Check the compression.
Operate the electric starter.2. Compression
There is compression.
There is no compression.
Check the ignition. 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.
Have a Yamaha dealer
check the ATV.
The engine does not start.
Check the battery.
Operate the electric starter.4. 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.
DryWet
Open the throttle halfway and operate
the electric starter.
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8Engine overheating
WARNING
EWB02290Wait 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 rec-
ommended 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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