engine YAMAHA GRIZZLY 550 2012 User Guide

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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.
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.EBU30450On-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 ” or “ 4WD”, the
indicator “” and the indicator light “DIFF.
LOCK ” will flash until the differential gear is com-
pletely locked or unlocked. If the indicator and
the indicator light continue to flash, the differen-
tial is not completely locked or unlocked. In this
case, start moving to allow time for the differen-
tial to lock or unlock.
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EBU30490Multi-function display The multi-function display is equipped with the fol-
lowing:
a speedometer
an odometer
two tripmeters (which show the distance trav-
eled since they were last set to zero)
a clock

an hour meter (which shows the total time the
engine has been running)
a fuel meter
a self-diagnosis device
Odometer and tripmeter modes
Pushing the “ SELECT” button switches the display
between the odometer mode “ ODO” and the trip-
meter modes “ TRIP A” and “ TRIP B ” in the follow-
ing order:
ODO → TRIP A → TRIP B → ODO
To reset a tripmeter, select it by pushing the “SE-
LECT ” button, and then push the “ RESET” button
for at least three seconds. The tripmeters can be
used to estimate the distance that can be traveled
with a full tank of fuel. This information will enable
you to plan future fuel stops.TIPPushing and holding in the “SELECT ” button, and
turning the key to “” (on) while the button is
pushed, switches the display between “mph” and
“ km/h ”.
1. “CLOCK ” button
2. “RESET ” button
3. “SELECT ” button
4. Speedometer
5. Fuel meter
6. Clock/Hour meter
7. Odometer/Tripmeter A/Tripmeter BU1HS60E0.book Page 5 Tuesday, April 26, 2011 7:53 PM

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4Self-diagnosis device
This model is equipped with a self-diagnosis de-
vice for various electrical circuits.
If a problem is detected in any of those circuits, the
multi-function display will indicate an error code.
If the multi-function display indicates an error code,
note the code number, and then have a Yamaha
dealer check the vehicle.
NOTICEECB00811If the multi-function display indicates an error
code, the vehicle should be checked as soon
as possible in order to avoid engine damage.
EBU18061Handlebar switches EBU18080Engine 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 situation. The
engine will not start or run when this switch is set
to “” .
1. Error code display
1. Light switch “/ /OFF”
2. Start switch “”
3. Engine stop switch “/”
4. Override switch “OVERRIDE”
5. Horn switch “”
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EBU18101Start 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.EBU18154Light 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.NOTICEECB00043Do 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 8-56.)EBU18170Horn switch “”
Press the switch to sound the horn.
EBU18190Override switch “OVERRIDE ”
Top speed is normally limited when operating in
differential gear lock. If conditions require more en-
gine power when riding forward, push and hold this
switch to override the differential gear lock speed
limiting function. (See page 4-10.) Releasing 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.1. Override switch “OVERRIDE”
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Riding before the differential gear is properly en-
gaged or disengaged (e.g., when the indicator
and indicator light are flashing) will cause the ve-
hicle speed to be limited until the differential gear
is completely engaged or disengaged.
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 differ-
ential gear lock speed limiter. (See page 4-8 for
a detailed explanation of this switch.)EBU18282Throttle lever Once 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.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.
EBU18323Speed limiter Your 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 avail- able and the maximum speed of the ATV, turn
the adjusting screw in direction (a). To de-1. Throttle lever
2WD
4WD
1
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crease the maximum engine power available
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 dam-
aged. Always make sure the throttle lever free
play is adjusted to 3.0
–5.0 mm (0.12 –0.20 in).
(See page 8-45.) WARNING! Improper ad-
justment of the speed limiter and throttle
could cause throttle cable damage or im-
proper throttle operation. You could lose
control, resulting in an accident.
[EWB00241]
3. Tighten the locknut.
EBU18391Front brake lever The front brake lever is located on the right handle-
bar. To apply the front brake, pull the brake lever
toward the handlebar grip.EBU18442Brake pedal and rear brake lever The brake pedal is located on the right side of the
ATV and the rear brake lever is located on the left
handlebar. To apply the rear brake, push down on
the brake pedal or pull the brake lever toward the
handlebar grip.
1. Locknut
2. Adjusting screw
3. No more than 12 mm (0.47 in)
2
1
3
(b)
(a)
1. Front brake lever
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To install the fuel tank cap
Install the fuel tank cap by turning it clockwise until
a click is heard, and then close the fuel tank cap
cover.
EBU18754Fuel Make sure there is sufficient gasoline in the tank.
WARNING
EWB02521Gasoline and gasoline vapors are extremely
flammable. To avoid fires and explosions and
to reduce the risk of injury when refueling, fol-
low these instructions.1. Before refueling, turn off the engine and be
sure that no one is sitting on the vehicle. Nev-
er refuel while smoking, or while in the vicinity
of sparks, open flames, or other sources of ig-
nition such as the pilot lights of water heaters
and clothes dryers.
2. Do not overfill the fuel tank. When refueling, be sure to insert the pump nozzle into the fuel
tank filler hole. Stop filling when the fuel reach-
es the bottom of the filler tube. Because fuel
1. Fuel tank cap cover
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4expands when it heats up, heat from the en-
gine or the sun can cause fuel to spill out of
the fuel tank.
3. Wipe up any spilled fuel immediately.
NOTICE: Immediately wipe off spilled fuel
with a clean, dry, soft cloth, since fuel may
deteriorate painted surfaces or plastic
parts.
[ECB00981]
4. Turn the fuel tank cap fully clockwise to make sure it is securely closed.
WARNING
EWB02531Gasoline is poisonous and can cause injury or
death. Handle gasoline with care. Never siphon
gasoline by mouth. If you should swallow
some gasoline or inhale a lot of gasoline vapor,
or get some gasoline in your eyes, see your
doctor immediately. If gasoline spills on your
skin, wash with soap and water. If gasoline
spills on your clothing, change your clothes.NOTICEECB00070Use only unleaded gasoline. The use of leaded
gasoline will cause severe damage to internal
engine parts, such as the valves and piston
rings, as well as to the exhaust system.
1. Maximum fuel level
2. Fuel tank filler tubeRecommended fuel:UNLEADED GASOLINE ONLY
For Europe: Regular unleaded gasoline only
with a research octane number of 91 or
higher
Fuel tank capacity: 20.0 L (5.28 US gal, 4.40 Imp.gal)
Fuel reserve amount: 4.5 L (1.19 US gal, 0.99 Imp.gal)
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Your Yamaha engine has been designed to use
regular unleaded gasoline with a research octane
number of 91 or higher. If knocking (or pinging) oc-
curs, use a gasoline of a different brand. Use of un-
leaded fuel will extend spark plug life and reduce
maintenance costs.
EBU18881Seat To remove the seat
Pull the seat lock lever upward and pull up the seat
at the rear. To install the seat
Insert the projections on the front of the seat into
the seat holders and push down on the seat at the
rear. Make sure that the seat is securely fitted.
EBU27362Storage compartments This ATV is equipped with two storage compart-
ments.
1. Seat
2. Seat lock lever
1. Projection
2. Seat holder
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4Shock absorber cylinder damage could also
result in poor handling which could cause an
accident.

Do not tamper with or attempt to open the
cylinder assembly.
Do not subject the shock absorber assembly
to an open flame or other high heat.
Do not deform or damage the cylinder in any
way.
Do not dispose of a damaged or worn out
shock absorber assembly yourself. Take the
shock absorber assembly to a Yamaha deal-
er for any service.EBU19183Auxiliary DC jack The auxiliary DC jack is located at the front right
side of the ATV. The auxiliary DC jack can be used
for suitable work lights, radios, etc. The auxiliary
DC jack should only be used when the engine is
running and the light switch is set to
“OFF ”.
1. Set the light switch to “ OFF”.
2. Turn the accessory off.
3. Start the engine. (See page 6-1.)
4. Open the auxiliary DC jack cap, and then in- sert the accessory power plug into the jack.
1. Auxiliary DC jack cap
1. Auxiliary DC jack
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