2015 YAMAHA GRIZZLY 450 engine

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EBU17681
DESCRIPTION
EBU17691Left view
EBU17701Right view
1. Radiator cap
2. Fuel cock
3. Throttle stop screw
4. Air filter case
5. Battery
6. Fuses
7. Tail/brake light
8. Engine oil filler cap
9. Oil filter cartridge
10.Coolant reservoir
11.V-belt cooling duct check hose
1 2 3 4 5,6 78
91011
1. Rear shock absorber assembly spring preload adjusting
ring
2. Spark arrester
3. Rear storage compartment and tool kit
4. Spark plug
5. Front shock absorber assembly spring preload adjusting ring
6. Rear brake light switch
7. Brake pedal
8. V-belt case drain plug1
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4
5
6
7
8
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EBU17735
INSTRUMENT AND CONTROL FUNCTIONS
EBU17761Main switchThe positions of the main switch are as follows:
ON
All electrical systems are supplied with power. The
headlights and taillight come on when the light
switch is on, and the engine can be started. The
key cannot be removed.
OFF
All electrical systems are off. The key can be re-
moved.
1. Main switch
EPS
1
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EBU17843Reverse indicator light “ ”
This indicator light comes on when the transmis-
sion is in the reverse position.
Furthermore, this indicator light flashes when the
engine is being raced for 10 seconds or more.TIPIf the indicator light flashes under any other cir-
cumstances or the speedometer does not show
the speed while riding, have a Yamaha dealer
check the speed sensor circuit. EBU17971Park indicator light “ ”
This indicator light comes on when the transmis-
sion is in the park position.EBU17921Coolant temperature warning light “ ”
This warning light comes on when the engine
overheats. When this occurs during operation,
stop the engine as soon as it is safe to do so and
allow it to cool down for about 10 minutes.
NOTICEECB00011The engine may overheat if the ATV is over-
loaded. In this case, reduce the load to spec-
ification.
 Start the engine after making sure that the
warning light is out. Continuous use while
the warning light is on may cause damage to
the engine. EBU29062Electric Power Steering warning light “EPS”
(for EPS model)
This warning light comes on when the key is
turned to “ON”, and then goes off once the engine
is started. If the warning light remains on or comes
on after the engine is started, the EPS system may
not be working correctly. When this occurs, have
a Yamaha dealer check the EPS system.
The electrical circuit of the warning light can be
checked by turning the key to “ON”. If the warning
light does not come on, have a Yamaha dealer
check the electrical circuit.
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TIPIf the engine is stopped using the engine stop
switch and the key is in the “ON” position, the
EPS warning light comes on to indicate that the
power assistance for the steering is not func-
tioning.
 If the steering load is too heavy (i.e., excessive
steering use when the ATV is traveling at a slow
speed), the power assist is reduced to protect
the EPS motor from overheating. EBU29622On-Command four-wheel-drive indicator “ ”,
On-Command differential gear lock
indicator “ ” and indicator light “DIFF. LOCK”
The On-Command four-wheel-drive indicator “ ”
comes on when the On-Command four-wheel-
drive switch is set to the “4WD” position.
The On-Command differential gear lock
indicator “ ” and the On-Command differential
gear lock indicator light “DIFF. LOCK” come on
when the On-Command differential gear lock
switch is set to the “LOCK” position.
TIPDue to the synchronizing mechanism in the dif-
ferential gear case, the four-wheel-drive indica-
tor may not come on until the ATV starts
moving.
 When the On-Command differential gear lock
switch is set to “LOCK”, the indicator “ ” and
the indicator light “DIFF. LOCK” will flash until
the differential gear is locked. If the indicator
and the indicator light continue to flash, the dif-
ferential is not locked. In this case, start moving
to allow time for the differential to lock.
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EBU18062Handlebar switchesEBU18081Engine stop switch “ / ”
Set this switch to “ ” before starting the engine.
The engine stop switch controls the ignition and
stops the engine when it is running. Use this
switch to stop the engine in an emergency situa-
tion. The engine will not start or run when this
switch is set to “ ”.
EBU18102Start switch “ ”
Push this switch to crank the engine with the start-
er. See the starting instructions on page 6-1 prior
to starting the engine.EBU18155Light switch “ / /OFF”
Set this switch to “ ” to turn on the low beams
and the taillight. Set the switch to “ ” to turn on
the high beams and the taillight. Set the switch to
“OFF” to turn off all the lights.NOTICEECB00044Do not use the headlights with the engine
turned off for an extended period of time, oth-
erwise the battery may discharge to the point
that the starter motor will not operate properly.
If this should happen, remove the battery and
recharge it. (See page 8-52.) EBU18171Horn switch “ ”
Press the switch to sound the horn.
1. Light switch “ / /OFF”
2. Start switch “ ”
3. Engine stop switch “ / ”
4. Override switch “OVERRIDE”
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EBU18191Override switch “OVERRIDE”
Top speed is normally limited when operating in
differential gear lock. If conditions require more
engine power when riding forward, push and hold
this switch to override the differential gear lock
speed limiting function. (See page 4-10.) Releas-
ing the switch restores the speed limiting function.
While the override switch is pushed, the segments
of the speedometer digits will appear as shown in
the figure.
TIPIf the digits of the speedometer appear as shown
when the switch is NOT being pushed, this could
indicate a malfunction in the electrical system. In
this case, take the ATV to a Yamaha dealer at the
first opportunity.
WARNING
EWB00151Always ride at a slow speed when the ATV is in
four-wheel-drive differential gear lock, and al-
low extra time and distance for maneuvers.
All wheels turn at the same speed when the dif-
ferential is locked, so it takes more effort to
turn the ATV. The effort needed to turn increas-
1. Override switch “OVERRIDE”U2LC61E0.book Page 8 Wednesday, February 26, 2014 3:56 PM

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4To release the differential gear lock, stop the ATV
and push the switch to the “4WD” position.
TIPWhen the switch is set to “LOCK”, the differen-
tial gear lock indicator and indicator light will
flash until the differential gear is locked.
 When the indicator and indicator light are flash-
ing, turning the handlebar back and forth will
help the differential gear lock to engage. 
Riding before the differential gear lock is prop-
erly engaged (e.g., when the indicator and indi-
cator light are flashing) will cause the vehicle
speed to be limited until engagement is com-
plete.
 When the ATV is in four-wheel-drive differential
gear lock, the maximum traveling speed is limit-
ed to 35 km/h (22 mi/h). However, if conditions
require full engine power to be available, push
and hold the override switch to disable the dif-
ferential gear lock speed limiter. (See page 4-8
for a detailed explanation of this switch.)
EBU18283Throttle leverOnce the engine is running, pushing the throttle le-
ver will increase the engine speed.
Regulate the speed of the ATV by varying the
throttle position. Because the throttle is spring-
loaded, the ATV will decelerate, and the engine
will return to an idle any time the throttle lever is re-
leased.
1. On-Command differential gear lock switch
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Before starting the engine, check the throttle to be
sure it is operating smoothly. Make sure it returns
to the idle position as soon as the lever is released.
EBU18324Speed limiterYour ATV is equipped with an adjustable speed
limiter. The speed limiter keeps the throttle from
fully opening, even when the throttle lever is
pushed to the maximum. 1. Loosen the locknut.
2. To increase the maximum engine power available and the maximum speed of the ATV,
turn the adjusting screw in direction (a). To decrease the maximum engine power avail-
able and the maximum speed of the ATV, turn
the adjusting screw in direction (b). Do not
turn the adjusting screw out more than 12
mm (0.47 in) or the throttle cable could be
damaged. Always make sure the throttle lever
free play is adjusted to 3.0–5.0 mm (0.12–
0.20 in). (See page 8-37.)
WARNING! Im-
proper adjustment of the speed limiter and
throttle could cause throttle cable damage
or improper throttle operation. You could
lose control, resulting in an accident.
[EWB00242]
1. Throttle lever
1. Locknut
2. Adjusting screw
3. No more than 12 mm (0.47 in)
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