2006 YAMAHA YFZ450 length

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 speciale
1. Tuerca de ajuste de precarga del resorte
2. Contratuerca 3. Llave especial
A. Spring length
A. Longueur du ressortA. Longitud del resorte
Adjust the spring preload as follows.
1. Loosen the locknut.
2. Turn the adjusting nut in direction ato
increase the spring preload and in direction
bto 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): 246.5 mm
Standard: 255 mm
Maximum (soft): 261.5 mm
Tightening torque:
Locknut:
30 Nm (3.0 m0kgf)
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4-43
4. Loosen the locknut.
5. Turn the adjusting nut in direction ato
increase the spring preload and in direction
bto decrease the spring preload.
NOTE:
A special wrench can be obtained at a Yamaha
dealer to make this adjustment.
6. The length of the spring (installed)
changes 1.5 mm per turn of the adjusting
nut.
1. Bolt (×3) 2. Air filter case1. Boulon (×3) 2. Boîtier de filtre à air1. Perno (×3) 2. Caja del filtro de aire
1. Locknut 2. Spring preload adjusting nut
3. Special wrench
1. Contre-écrou 2. Écrou de réglage de la
précontrainte du ressort
3. Clé spéciale
1. Contratuerca 2. Tuerca de ajuste de la
precarga del muelle
3. Llave especial
5TG-9-62 4 5/12/05 5:18 PM Page 4-43

4-45
A. Spring lengthA. Longueur du ressortA. Longitud del resorte
7. Tighten the locknut to the specified torque.
cC
Always tighten the locknut against the
adjusting nut, and then tighten it to the spec-
ified torque.
8. Place the air filter case in the original posi-
tion, 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): 250 mm
Standard: 257 mm
Maximum (soft): 264 mm
Tightening torque:
Locknut:
45 Nm (4.5 m0kgf)
5TG-9-62 4 5/12/05 5:18 PM Page 4-45

5-1
EBU01130
PRE-OPERATION CHECKS
Before using this machine, check the following points:
ITEM ROUTINE PAGE
Front brake9Check operation lever, free play, fluid level and fluid leakage. 5-7–5-11, 8-81,
9Fill with DOT 4 brake fluid if necessary. 8-85–8-91
Rear brake9Check operation, fluid level and fluid leakage. 5-7–5-11
9Fill with DOT 4 brake fluid if necessary. 8-83–8-89, 8-93
Clutch9Check operation, condition and lever free play. 8-103
Parking brake9Check operation, condition and cable length. 8-97–8-99
Fuel 9Check fuel level.
9Fill with fuel if necessary.5-13–5-15
Engine oil9Check oil level.
9Fill with oil if necessary.5-17, 8-25–8-41
Coolant reservoir 9Check coolant level in reservoir.
9Fill with coolant if necessary.5-19–5-21, 8-43–8-53
Drive chain9Check chain slack and condition.
9Adjust if necessary.5-21, 8-105–8-113
Throttle9Check for proper throttle cable operation and free play. 5-21, 8-79
Wheels and tires9Check tire pressure, wear and damage. 5-23–5-29, 8-125–8-127
Fittings and fasteners9Check all fittings and fasteners. 5-29
Lights and switches9Check for proper operation. 5-29, 8-99, 8-137–8-141
5TG-9-62 5-6 5/13/05 1:45 PM Page 5-1

8-97
EBU14160
Parking brake adjustment
Parking brake adjustment may be required if the
parking brake does not hold properly. The cable
length Ashould be adjusted to 47–51 mm.
1. Loosen the locknut and the adjusting nut
on the brake cable below the fuel tank.
2. Fully loosen the locknut and the adjusting
bolt at the rear brake caliper.
3. Turn the adjusting nut on the brake cable
in direction ato increase the cable length
or in direction bto decrease the cable
length.
NOTE:
If the cable cannot be adjusted to specification,
consult a Yamaha dealer.
4. Tighten the locknut on the brake cable.
1
2A
1. Locknut 2. Adjusting bolt
A. Cable length
1. Contre-écrou 2. Boulon de réglage
A. Longueur du câble
1. Contratuerca 2. Perno de ajuste
A. Longitud del cable
1. Locknut 2. Adjusting nut
1. Contre-écrou 2. Écrou de réglage1. Contratuerca 2. Tuerca de ajuste
5TG-9-62 9-11 5/12/05 6:14 PM Page 8-97

8-107
EBU15752
Adjusting the drive chain slack
1. Loosen the rear axle pinch bolts.
2. Insert a rod of a diameter of 8 mm and a
length of 10 cm into one of the holes in the
drive chain tensioner as shown.
3. Shift the transmission into the neutral posi-
tion.
4. To loosen the drive chain, push the ATV
forward, and to tighten the drive chain,
push the ATV backward.
cC
Improper drive chain slack will overload the
engine as well as other vital parts of the ATV
and can lead to chain slippage or breakage.
To prevent this from occurring, keep the
drive chain slack within the specified limits.
4
2
11
3
1. Rear axle pinch bolt (×4) 2. Rod
3. Drive chain tensioner 4. Hole (×3)
1. Boulon de pincement de 2. Tige
l’essieu arrière (×4)
3. Tendeur de chaîne de 4. Orifice (×3)
transmission
1. Perno de sujeción del 2. Barra
eje trasero (×4)
3. Tensor de la cadena de 4. Orificio (×3)
transmisión
5TG-9-62 9-11 5/12/05 6:14 PM Page 8-107

10-1
Model YFZ450V
Dimension:
Overall length 1,840 mm
Overall width 1,170 mm
Overall height 1,090 mm
Seat height 810 mm
Wheel base 1,280 mm
Ground clearance 255 mm
Minimum turning radius: 3,500 mm
Basic weight:
With oil and full fuel tank 169 kg
Engine:
Type Liquid cooled, 4-stroke, DOHC
Cylinder arrangement Forward-inclined single cylinder
Displacement 449.0cm
3
Bore ×Stroke 95.0 ×63.4 mm
Compression ratio 11.20 : 1
Starting system Electric starter
Lubrication system Dry sump
EBU04280
SPECIFICATIONS
5TG-9-62 9-11 5/12/05 6:14 PM Page 10-1