warning YAMAHA YFZ450 2005 User Guide

4-5
3. Push the start switch. If the warning light
does not come on while the start switch is
pushed, have a Yamaha dealer check the
electrical circuit.CAUTION:_

The engine may overheat if the ATV is
overloaded. If this happens, reduce the
load to specification.


Restart after making sure that the light is
off. Continuous use while the light is on
may cause damage to the engine.
_
U5TG61.book Page 5 Friday, April 2, 2004 11:28 AM

4-11 1. Throttle lever
1. Levier d’accélération
1. Palanca de aceleración
EBU00630
Throttle lever
Once the engine is running, movement of the
throttle lever will increase the engine speed.
Regulate the speed of the machine by varying the
throttle position. Because the throttle is spring-
loaded, the machine will decelerate, and the en-
gine will return to an idle any time the hand is re-
moved 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
_ Malfunction 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
operation of the throttle lever before you start
the engine. If the throttle does not work
smoothly, check for the cause. Correct the
problem before riding the ATV or consult a
Yamaha dealer. _
U5TG61.book Page 11 Friday, April 2, 2004 11:28 AM

4-13 1. Locknut 2. Adjusting screw
a. No more than 12 mm
1. Contre-écrou 2. Vis de réglage
a. 12 mm maximum
1. Contratuerca 2. Tornillo de ajuste
a. 12 mm como máximo
EBU11980
Speed limiter
The speed limiter keeps the throttle from fully
opening, even when the throttle lever is pushed to
the maximum. Turning in the adjusting screw limits
the maximum engine power available and de-
creases the maximum speed of the ATV.
WARNING
_ Improper 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
or the throttle cable could be damaged. Always
make sure the throttle lever free play is adjust-
ed to 2–4 mm. See page 8-77. _
U5TG61.book Page 13 Friday, April 2, 2004 11:28 AM

4-19 1. Parking brake lever (Locked position)
1. Levier de frein de stationnement (frein serré)
1. Palanca del freno de estacionamiento (posición de bloqueo)
1. Parking brake lever (Unlocked position)
1. Levier de frein de stationnement (frein relâché)
1. Palanca del freno de estacionamiento
(posición de desbloqueo)
EBU14072
Parking brake lever
Use the parking brake when you have to start the
engine or park the machine, especially on a slope.
To apply the parking brake, move the parking
brake lever in direction
a. To release the parking
brake, move the parking brake lever in
direction
b.
WARNING
_

Always set the parking brake before start-
ing the engine. The ATV could start mov-
ing unexpectedly if the parking brake is not
applied. This could cause loss of control or
a collision.


Always be sure you have released the
parking brake before you begin to ride. The
brake could overheat if you ride the ATV
without releasing the parking brake. You
could lose braking performance which
could cause an accident. You could also
wear out the brakes prematurely.
_
U5TG61.book Page 19 Friday, April 2, 2004 11:28 AM

4-29
EBU14082
Front shock absorber adjustment
The spring preload, rebound damping and com-
pression damping forces of the front shock ab-
sorbers can be adjusted to suit the rider’s weight
and the riding conditions.
WARNING
_ These shock absorbers contain highly pres-
surized nitrogen gas. Read and understand the
following information before handling the
shock absorbers.

Do not tamper with or attempt to open the
cylinder assemblies.


Do not subject the shock absorbers to an
open flame or other high heat source. This
may cause the unit to explode due to ex-
cessive gas pressure.


Do not deform or damage the cylinders in
any way. Cylinder damage will result in
poor damping performance.


Take the shock absorbers to a Yamaha
dealer for any service.
_
U5TG61.book Page 29 Friday, April 2, 2004 11:28 AM

4-37
NOTE:_ Although the total number of clicks of a damping
force adjusting mechanism may not exactly match
the above specifications due to small differences
in production, the actual number of clicks always
represents the entire adjusting range. To obtain a
precise adjustment, it would be advisable to check
the number of clicks of each damping force adjust-
ing mechanism and to modify the specifications as
necessary. _
WARNING
_

Suspension components become hot dur-
ing operation. Never touch the compres-
sion damping force adjusting screw, the
rebound damping force adjusting screw or
the oil reservoir with your bare hand or
skin until suspension components have
cooled.


Always adjust the shock absorbers on the
left and right side to the same setting.
_
U5TG61.book Page 37 Friday, April 2, 2004 11:28 AM

4-39
EBU14102
Rear shock absorber adjustment
The spring preload, rebound damping and com-
pression damping forces of the rear shock absorb-
er can be adjusted to suit the rider’s weight and the
riding conditions.
WARNING
_ This shock absorber contains highly pressur-
ized nitrogen gas. Read and understand the
following information before handling the
shock absorber.

Do not tamper with or attempt to open the
cylinder assembly.


Do not subject the shock absorber to an
open flame or other high heat source. This
may cause the unit to explode due to ex-
cessive gas pressure.


Do not deform or damage the cylinder in
any way. Cylinder damage will result in
poor damping performance.


Take the shock absorber to a Yamaha deal-
er for any service.
_
U5TG61.book Page 39 Friday, April 2, 2004 11:28 AM

4-51
CAUTION:_ Never turn an adjusting mechanism beyond
the minimum and maximum settings. _
WARNING
_ Suspension components become hot during
operation. Never touch the compression
damping force adjusting screw, the rebound
damping force adjusting screw or the oil reser-
voir with your bare hand or skin until suspen-
sion components have cooled. _
U5TG61.book Page 51 Friday, April 2, 2004 11:28 AM

5-4
WARNING
_ Always inspect your ATV each time you use it to make sure the ATV is in safe operating condition.
Always follow the inspection and maintenance procedures and schedules described in the Own-
er’s Manual. Failure to inspect increases the possibility of an accident or equipment damage. _
AVERTISSEMENT
_ Toujours effectuer ces contrôles avant chaque départ afin de s’assurer que le VTT peut être utilisé en toute sécu-
rité. Toujours respecter les procédés et intervalles de contrôle et d’entretien repris dans ce manuel. Omettre ces
contrôles accroît les risques d’accident ou d’endommagement du véhicule. _
ADVERTENCIA
_ Inspeccionar siempre el ATV cada vez que vaya a utilizarse, para asegurarse de que está en condicio-
nes de funcionar sin peligro. Seguir siempre los procedimientos y programas de inspección y mante-
nimiento descritos en el Manual del Propietario. Si no se inspecciona la máquina, aumenta el riesgo de
accidente o avería. _ U5TG61.book Page 4 Friday, April 2, 2004 11:28 AM

5-7
Brake fluid leakage
Check to see if any brake fluid is leaking out of the
pipe joints or brake fluid reservoirs. Apply the
brakes firmly for one minute. If there is any leak-
age, have a Yamaha dealer inspect the brake sys-
tem.
Brake operation
Test the brakes at slow speed after starting out to
make sure they are working properly. If the brakes
do not provide proper braking performance, in-
spect the brake pads for wear. (See pages 8-79–
8-81.)
WARNING
_ Always check the brakes at the start of every
ride. Do not ride the ATV if you find any prob-
lem with the brakes or you could lose braking
ability, which could lead to an accident. If a
problem cannot be corrected by the adjust-
ment procedures provided in this manual,
have a Yamaha dealer check for the cause. _
U5TG61.book Page 7 Friday, April 2, 2004 11:28 AM