2006 YAMAHA YFZ450 fuel

8-77
EBU13970
Idle speed adjustment
A special tester is needed to check the engine
r/min on this model.
Therefore, take the ATV to a Yamaha dealer to
have the idle speed adjusted.
EBU03030
Valve clearance adjustment
The correct valve clearance changes with use,
resulting in improper fuel/air supply or engine
noise. To prevent this, the valve clearance must
be adjusted regularly. This adjustment however,
should be left to a professional Yamaha service
technician.Specified idle speed:
1,750–1,850 r/min
5TG-9-62 8 5/13/05 1:48 PM Page 8-77

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

8-145
EBU04130
Troubleshooting
Although Yamaha machines receive a rigid
inspection before shipment from the factory,
trouble may occur during operation.
Any problem in the fuel, compression, or ignition
systems can cause poor starting and loss of
power. The troubleshooting chart describes a
quick, easy procedure for making checks. If your
machine requires any repair, take it to a
Yamaha dealer.
The skilled technicians at a Yamaha dealership
have the tools, experience, and know-how to
properly service your machine. Use only gen-
uine Yamaha parts on your machine. Imitation
parts may look like Yamaha parts, but they are
often inferior. Consequently, they have a shorter
service life and can lead to expensive repair
bills.
5TG-9-62 9-11 5/12/05 6:14 PM Page 8-145

8-147
w
Do not smoke when checking the fuel sys-
tem. Fuel can ignite or explode, causing
severe injury or property damage. Make sure
there are no open flames or sparks in the
area, including pilot lights from water
heaters or furnaces.
5TG-9-62 9-11 5/12/05 6:14 PM Page 8-147

8-149
EBU07240
Troubleshooting chart
Starting problems or poor
engine performance
2. Compression
Use the electric
starter to see if there
is compression.
3. Ignition
Remove the spark plug
and check the electrodes.
WetWipe clean with
dry cloth.
DryAttach spark plug cap
and ground to chassis.Use the electric
starter.Spark weak.
Spark good.Ignition system normal.
No spark.
Ask a Yamaha dealer to inspect.
Adjust the spark plug gap
or replace the spark plug.
There is compresson.Compression normal.
Ask a Yamaha dealer to inspect.No compression.
4. Battery
Use the electric
starter
Engine turns over
quickly.Battery is good.
Check the connections, and charge the battery if necessary.Engine turns over
slowly
Check the fuel
flow.
1. Fuel
Check if there is
fuel in the fuel
tank.
There is fuel.Turn the fuel
cock to “OFF”.
Remove the
fuel hose from
the fuel cock.Turn the fuel cock
lever to “ON”.No fuel.Fuel cock clogged.
Some fuel.Turn the fuel cock
lever to “RES”.Restart the engine.
No fuel.Supply fuel.
Clean the fuel
cock.
5TG-9-62 9-11 5/12/05 6:14 PM Page 8-149

9-7
EBU05260
B. STORAGE
Long term storage (60 days or more) of your
machine will require some preventive proce-
dures to guard against deterioration. After thor-
oughly cleaning the machine, prepare for stor-
age as follows:
1. Fill the fuel tank with fresh fuel and add
fuel stabilizer (if available).
NOTE:
Use of fuel stabilizer eliminates the need to
drain the fuel system. Consult a Yamaha dealer
if the fuel system is to be drained instead.
2. Remove the spark plug, pour about one
tablespoon of SAE 10W30 or 20W40
motor oil in the spark plug hole and rein-
stall the spark plug. Ground the spark plug
wire and turn the engine over several times
to coat the cylinder wall with oil.
3. Clean the drive chain thoroughly and lubri-
cate it. (See page 8-111.)
5TG-9-62 9-11 5/12/05 6:14 PM Page 9-7

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

10-3
Model YFZ450V
Cooling system:
Radiator capacity (Including all routes) 1.30 L
Coolant reservoir capacity
(Up to the maximum level mark) 0.29 L
Air filter: Wet type element
Fuel:
Type PREMIUM UNLEADED GASOLINE ONLY
For Europe:
PREMIUM UNLEADED GASOLINE ONLY with
a research octane number of 97 or higher
Tank capacity 10.0 L
Reserve amount 1.9 L
Carburetor:
Type ×quantity FCR39H ×1
Manufacturer KEIHIN
Spark plug:
Type/manufacturer CR8E/NGK
Spark plug gap 0.7–0.8 mm
Clutch :
Type Wet, multiple-disc
Operation Left hand operation
5TG-9-62 9-11 5/12/05 6:14 PM Page 10-3