2005 YAMAHA YFZ450 service

FBU12031
INTRODUCTION
Félicitations pour l’achat du YFZ450 de Yamaha. Ce
modèle représente le fruit de nombreuses années d’expé-
rience Yamaha dans la production de véhicules de sport,
de tourisme et de course. Ce véhicule permettra à son pi-
lote de pleinement apprécier la perfection technique et la
fiabilité qui ont fait de Yamaha un leader dans ces domai-
nes.
Ce manuel apporte une meilleure compréhension des ca-
ractéristiques et du fonctionnement du véhicule. Le ma-
nuel donne en outre des conseils importants relatifs à
la sécurité. Il informe sur les compétences et techni-
ques particulières indispensables au pilotage du véhi-
cule.
Ce manuel explique également les procédés d’ins-
pection et d’entretien élémentaires. Les concessionnaires
Yamaha sont au service de leur clientèle et répondront à
toute question concernant le fonctionnement ou l’entre-
tien de ce véhicule.
SBU12031
INTRODUCCIÓN
Le felicitamos por su compra de la Yamaha YFZ450.
Representa el resultado de muchos años de expe-
riencia de Yamaha en la producción de excelentes
motos deportivas y de turismo, y de máquinas de
competición que marcan el ritmo de las carreras.
Con la compra de esta Yamaha, podrá apreciar el
alto grado de perfección técnica y fiabilidad que han
convertido a Yamaha en el líder de estos campos.
El presente manual le proporcionará un buen cono-
cimiento básico de las características y el manejo de
este ATV.
También contiene indicaciones impor-
tantes acerca de la seguridad y aporta informa-
ción sobre las técnicas y habilidades especiales
necesarias para conducir el ATV. Incluye también
los procedimientos básicos de mantenimiento e ins-
pección. Si tiene alguna duda respecto al manteni-
miento o manejo del ATV, consulte a su concesiona-
rio Yamaha.
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4-26
FBU00950
Starter (enrichisseur) “”
La mise en marche à froid requiert un mélange air-carbu-
rant plus riche. C’est le starter qui remplit cette fonction
d’enrichissement du mélange.
Déplacer dans la direction a
pour mettre le starter (enri-
chisseur) en service.
Déplacer dans la direction b
pour mettre le starter (enri-
chisseur) hors service.
La marche à suivre correcte est décrite à la section “Mise
en marche d’un moteur froid”. (Pour plus de détails, voir
page 6-4.)
SBU00950
Starter (choke) “”
Cuando el motor está frío, requiere una mezcla más
rica de combustible para arrancar. Esta mezcla se
suministra a través de un circuito separado, el circui-
to del “starter”.
Mueva en la dirección
a para conectar el starter
(choke).
Mueva en la dirección
b para desconectar el starter
(choke).
Consulte el apartado de “Arranque en frío del motor”
para ver la operación adecuada. (Consulte la
página 6-4.)
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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.
_
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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.
_
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5-19
EBU11620
Fittings and fasteners
Always check the tightness of chassis fittings and
fasteners before a ride. Take the machine to a
Yamaha dealer or refer to the Service Manual for
correct tightening torque.
EBU10030
Lights
Check the headlights and tail/brake light to make
sure they are in working condition. Repair as nec-
essary for proper operation.
EBU11700
Switches
Check the operation of all switches. Have a
Yamaha dealer repair as necessary for proper op-
eration.
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8-1
EBU05160
1-PERIODIC MAINTENANCE AND
ADJUSTMENTPeriodic inspection, adjustment and lubrication will
keep your machine in the safest and most efficient
condition possible. Safety is an obligation of the
machine owner. The most important points of ma-
chine inspection, adjustment and lubrication are
explained on the following pages.
WARNING
_ Never service an engine while it is running.
Moving parts can catch clothing or parts of the
body, causing injury. Electrical components
can cause shocks or can start fires. Turn off
the engine when performing maintenance un-
less otherwise specified. Have a Yamaha deal-
er perform service if you are not familiar with
machine service. _
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8-3 1. Owner’s manual 2. Owner’s tool kit
3. Low-pressure tire gauge
1. Manuel du propriétaire 2. Trousse à outils
3. Manomètre basse pression pour pneus
1. Manual del propietario 2. Equipo de herramientas
3. Comprobador de la presión de los neumáticos
EBU12220
Owner’s manual and tool kit
You are recommended to put this owner’s manual
and low-pressure tire gauge in the vinyl bag and
always carry them along with the owner’s tool kit
under the seat. The service information included in
this manual is intended to provide you, the owner,
with the necessary information for completing your
own preventive maintenance and minor repairs.
The tools provided in the owner’s tool kit are suffi-
cient for this purpose, except that a torque wrench
is also necessary to properly tighten nuts and
bolts.NOTE:_ If you do not have a torque wrench available dur-
ing a service operation requiring one, take your
machine to a Yamaha dealer to check the torque
settings and adjust them as necessary.
U5TG61.book Page 3 Friday, April 2, 2004 11:28 AM

8-8 * Since these items require special tools, data and technical skills, have a Yamaha dealer perform the service.
Engine oil filter element
Replace.Drive chain
Check and adjust slack/alignment/clean/lube.Front brake*Check free play/operation/fluid leakage/
See NOTE Page 8-9.
Correct if necessary.Rear brake*Check operation/fluid leakage/See NOTE Page 8-9.
Correct if necessary.Clutch*Check operation.
Adjust if necessary.Wheels*Check balance/damage/runout.
Replace if necessary.Wheel bearings*Check bearing assemblies for looseness/damage.
Replace if damaged.Steering system*Check operation.
Repair if damaged.
Check toe-in.
Adjust if necessary.Front and rear
suspension*Check operation.
Correct if necessary.Upper and lower arm
pivot and steering shaft*Lubricate every 6 months with lithium-soap-based grease.Rear arm pivot*
Lubricate every 6 months with lithium-soap-based grease.Fittings and fasteners*Check all chassis fittings and fasteners.
Correct if necessary.Lights and switches*Check operation.
Adjust headlight beams.
ITEM ROUTINEWhichever
comes firstINITIAL EVERY
month136612
km
(mi)320
(200)1,200
(750)2,400
(1,500)2,400
(1,500)4,800
(3,000)
hours 20 75 150 150 300
U5TG61.book Page 8 Friday, April 2, 2004 11:28 AM