2005 YAMAHA YFZ450 torque

4-31 1. Spring preload adjusting nut
2. Locknut 3. Special wrench
1.Écrou de réglage de la précontrainte de ressort
2. Contre-écrou 3. Clé spéciale
1. Tuerca de ajuste de precarga del resorte
2. Contratuerca 3. Llave especial
A. Spring length
A. Longueur du ressort
A. Longitud del muelle
Adjust the spring preload as follows.
1. Loosen the locknut.
2. Turn the adjusting nut in direction
a to in-
crease the spring preload and in direction
b
to decrease the spring preload.
3. The length of the spring (installed) changes
1.5 mm per turn of the adjusting nut.NOTE:_ A special wrench can be obtained at a Yamaha
dealer to make this adjustment. _4. Tighten the locknut to the specified torque.Measurement
A:
Installed length:
Minimum (hard): 248 mm
Standard: 255 mm
Maximum (soft): 263 mm
Tightening torque:
Locknut:
30 Nm (3.0 m·kgf)
U5TG61.book Page 31 Friday, April 2, 2004 11:28 AM

4-33 1. Rebound damping force adjusting screw
1. Vis de réglage de la force d’amortissement de détente
1. Tornillo de ajuste de la fuerza de amortiguación de rebote
CAUTION:_ Always tighten the locknut against the adjust-
ing nut, and then tighten it to the specified
torque. _Adjust the rebound damping force as follows.
Turn the rebound damping force adjusting screw
in direction
a to increase the rebound damping
force and in direction
b to decrease the rebound
damping force.
From the fully turned-in position
Minimum (soft): 22 click(s) out
Standard: 9 click(s) out
Maximum (hard): 1 click(s) out
U5TG61.book Page 33 Friday, April 2, 2004 11:28 AM

4-45 A. Spring length
A. Longueur du ressort
A. Longitud del muelle
7. Tighten the locknut to the specified torque.CAUTION:_ Always tighten the locknut against the adjust-
ing nut, and then tighten it to the specified
torque. _8. Place the air filter case in the original position,
connect the air intake duct, and then tighten
the clamp screw at the carburetor side.
9. Install the bolts, and then connect the hose.
10. Install the seat.Measurement
A:
Installed length:
Minimum (hard): 237 mm
Standard: 244 mm
Maximum (soft): 251 mm
Tightening torque:
Locknut:
45 Nm (4.5 m·kgf)
U5TG61.book Page 45 Friday, April 2, 2004 11:28 AM

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.
U5TG61.book Page 19 Friday, April 2, 2004 11:28 AM

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

8-31 1. Oil filter element cover 2. Bolt (× 3)
1. Couvercle de l’élément du filtre à huile
2. Boulon (× 3)
1. Cubierta del elemento del filtro de aceite
2. Perno (× 3)
1. Oil filter element 2. O-ring (× 4)
1.Élément du filtre à huile 2. Joint torique (× 4)
1. Filtro de aceite 2. Junta tórica (× 4)
NOTE:_ Skip steps 7–10 if the oil filter element is not being
replaced. _7. Remove the oil filter element cover by remov-
ing the bolts, and then remove the oil filter el-
ement.
8. Check the O-rings for damage, and replace
them if necessary.
9. Install a new oil filter element and the O-rings.NOTE:_ Make sure that the O-rings are properly seated. _10. Install the oil filter element cover by installing
the bolts, and then tighten them to the speci-
fied torque.
U5TG61.book Page 31 Friday, April 2, 2004 11:28 AM

8-33
11. Install the crankcase engine oil drain bolt and
the engine oil tank drain bolt, and then tighten
them to the specified torques.
12. Pour the specified amount of recommended
engine oil through the engine oil tank filler
hole, insert the dipstick, and then tighten the
engine oil tank filler cap.
13. Pour the specified amount of recommended
engine oil through the engine oil filler hole,
and then install and tighten the engine oil filler
cap. Tightening torque:
Oil filter element cover bolt:
10 Nm (1.0 m·kgf)
Tightening torques:
Crankcase engine oil drain bolt:
20 Nm (2.0 m·kgf)
Engine oil tank drain bolt:
19 Nm (1.9 m·kgf)
U5TG61.book Page 33 Friday, April 2, 2004 11:28 AM

8-37
CAUTION:_

In order to prevent clutch slippage (since
the engine oil also lubricates the clutch),
do not mix any chemical additives. Do not
use oils with a diesel specification of “CD”
or oils of a higher quality than specified. In
addition, do not use oils labeled “ENERGY
CONSERVING II” or higher.


Make sure that no foreign material enters
the crankcase.
_14. Start the engine, and then let it idle for seve-
ral minutes while checking it for oil leakage. If
oil is leaking, immediately turn the engine off
and check for the cause.
15. Turn the engine off, and then check the oil
level and correct it if necessary.
16. Install the engine guard by installing the bolts,
and then tighten them to the specified torque.
U5TG61.book Page 37 Friday, April 2, 2004 11:28 AM