2009 YAMAHA GRIZZLY 450 Owners Manual

4-10
4
To release the differential gear lock, stop the ATV
and push the switch to the “4WD” position.
WARNING
EWB00131Always stop the ATV before changing from
four-wheel drive to four-wheel-drive differen-
tial gear lock or vice versa.
The ATV handles differently in four-wheel drive
than in differential gear lock in some circum-
stances. Changing from four-wheel drive to dif-
ferential gear lock or vice versa while moving
may cause the ATV to handle differently unex-pectedly. This could distract the operator and
increase the risk of losing control and causing
an accident.
WARNING
EWB00140Always ride at a slow speed when the ATV is in
differential gear lock, and allow extra time and
distance for maneuvers.
All wheels turn at the same speed when the dif-
ferential gear is locked, so it takes more effort
to turn the ATV. The effort needed to turn in-
creases with the riding speed. You may lose
control and have an accident if you cannot
make a sharp enough turn for the speed youare traveling.TIP
When the switch is set to “LOCK”, the differential
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.
1. On-Command differential gear lock switch “4WD”/“LOCK”U37S60E0.book Page 10 Thursday, June 5, 2008 6:51 PM

4-11
4

Riding before the differential gear lock is proper-
ly engaged (e.g., when the indicator and indica-
tor light are flashing) will cause the engine speed
to be limited until engagement is complete.
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 4-6 fora detailed explanation of this switch.)EBU18280Throttle lever Once the engine is running, movement of the throt-
tle lever 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 hand is removed from
the throttle lever.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.
WARNING
EWB00250Malfunction of the throttle could make it diffi-
cult to speed up or slow down when you need
to. This could cause an accident. Check the op-
eration of the throttle lever before you start the
engine. If the throttle does not work smoothly,
check for the cause. Correct the problem be-fore riding the ATV or consult a Yamaha dealer.1. Throttle lever
U37S60E0.book Page 11 Thursday, June 5, 2008 6:51 PM

4-12
4
EBU18321Speed limiter Your ATV was delivered 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-
crease the maximum engine power available
and the maximum speed of the ATV, turn the
adjusting screw in direction (b).3. Tighten the locknut.
WARNING
EWB00240Improper adjustment of the speed limiter and
throttle could cause throttle cable damage or
improper throttle operation. You could lose
control, have an accident or be injured. 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 8-38.)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.
1. Locknut
2. Adjusting screw
3. No more than 12 mm (0.47 in)U37S60E0.book Page 12 Thursday, June 5, 2008 6:51 PM

4-13
4
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. Front brake lever
1. Brake pedal
1. Rear brake lever
U37S60E0.book Page 13 Thursday, June 5, 2008 6:51 PM

4-14
4
EBU18611Drive select lever The drive select lever is used to shift your ATV into
the low-range, high-range, neutral, reverse and
park positions. See the “Operating the drive select
lever and driving in reverse” section on page 6-3
for the drive select lever operation.EBU18690Recoil starter Firmly grasp the handle and pull slightly until en-
gagement can be felt. Then pull forcefully, being
careful not to pull the rope all the way out.
WARNING
EWB00330Always shift the drive select lever to park posi-
tion before starting the engine, otherwise the
ATV could start to move unexpectedly, whichcould cause an accident.EBU18720Fuel tank cap Remove the fuel tank cap by turning it counter-
clockwise.
1. Drive select lever
1. Recoil starter
U37S60E0.book Page 14 Thursday, June 5, 2008 6:51 PM

4-15
4
EBU18752Fuel Make sure that there is sufficient fuel in the tank.
Fill the fuel tank to the bottom of the filler tube as
shown.1. Fuel tank cap
1. 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 high-
er
Fuel tank capacity:
15.0 L (3.96 US gal, 3.30 Imp.gal)
Fuel reserve amount:
4.5 L (1.19 US gal, 0.99 Imp.gal)
U37S60E0.book Page 15 Thursday, June 5, 2008 6:51 PM

4-16
4
TIPIf knocking or pinging occurs, use a different brandof gasoline or higher octane grade.NOTICEECB00070Use only unleaded gasoline. The use of leaded
gasoline will cause severe damage to internal
engine parts, such as the valves and pistonrings, as well as to the exhaust system.
WARNING
EWB00310
Do not overfill the fuel tank. Fuel expands
when it heats up. If the fuel tank is overfilled,
fuel could spill out due to heat from the en-
gine or the sun.
Be careful not to spill fuel, especially on the
engine or exhaust pipe which can cause a
fire and severe injury. Wipe up any spilled
fuel immediately.
Do not refuel right after the engine has been
running and is still very hot.
Be sure the fuel tank cap is closed securely.
EBU18820Fuel cock The fuel cock supplies fuel from the tank to the car-
buretor while also filtering it.
The fuel cock lever positions are explained as fol-
lows and shown in the illustrations.
OFF
With the fuel cock lever in this position, fuel will not
flow. Always turn the fuel cock lever to this position
when the engine is not running.1. Arrow mark pointing to “OFF”
U37S60E0.book Page 16 Thursday, June 5, 2008 6:51 PM

4-17
4ON
With the fuel cock lever in this position, fuel flows
to the carburetor. Turn the fuel cock lever to this
position when starting the engine and riding.RES
This indicates reserve. With the fuel cock lever in
this position, the fuel reserve is made available.
Turn the fuel cock lever to this position if you run
out of fuel while riding. When this occurs, refuel as
soon as possible and be sure to turn the fuel cock
lever back to “ON”!
EBU18850Starter (choke)“” Starting a cold engine requires a richer air-fuel mix-
ture, which is supplied by the starter (choke).
Move the starter (choke) in direction (a) to turn on
the starter (choke).
1. Arrow mark pointing to “ON”
1. Arrow mark pointing to “RES”
U37S60E0.book Page 17 Thursday, June 5, 2008 6:51 PM