2008 YAMAHA YFZ450 headlight bulb

Replacing a headlight bulb ...................... 8-47
Adjusting a headlight beam ..................... 8-49
Replacing the tail/brake light bulb ........... 8-50
Removing a wheel ................................... 8-50
Installing a wheel ..................................... 8-50
Troubleshooting ...................................... 8-51
Troubleshooting charts ............................ 8-52
CLEANING AND STORAGE .......................... 9-1
Cleaning .................................................... 9-1
Storage ...................................................... 9-2
SPECIFICATIONS ...................................... 10-1
CONSUMER INFORMATION ...................... 11-1
Identification numbers ............................. 11-1

8-47
1
2
3
4
5
6
78
9
10
11

the main switch when checking or replacing a
fuse.
2. Remove the blown fuse, and then install a
new fuse of the specified amperage.
WARNING

EWB02171
Always use a fuse of the specified rating, and
never use a substitute object in place of the
proper fuse. An improper fuse or a substitute
object can cause damage to the electrical sys-
tem, which could lead to a fire.
3. Turn the key to “ON” and turn on the electrical
circuits to check if the devices operate.
4. If the fuse immediately blows again, have a
Yamaha dealer check the electrical system.
EBU25440
Replacing a headlight bulb
If a headlight bulb burns out, replace it as follows.
1. Remove the headlight unit by removing the
bolts.2. Disconnect the headlight coupler.
3. Remove the headlight bulb holder cover. Specified fuse:
15.0 A
1. Headlight assembly
2. Bolt21

8-48
1
2
3
4
5
6
78
9
10
11

4. Remove the headlight bulb holder by pushing
it in and turning it counterclockwise, and then
remove the defective bulb.
WARNING

EWB02230
Do not touch a headlight bulb when it is on or
immediately after it is turned off. You can be
burned or a fire could start if the bulb touches
something flammable. Wait for the bulb to cool
before touching or removing it.
5. Place a new headlight bulb into position.
1. Headlight bulb holder cover
2. Headlight coupler
1
2

1. Headlight bulb holder
1

8-49
1
2
3
4
5
6
78
9
10
11
CAUTION:

ECB00650
Do not touch the glass part of the headlight
bulb to keep it free from oil, otherwise the
transparency of the glass, the luminosity of the
bulb, and the bulb life will be adversely affect-
ed. Thoroughly clean off any dirt and finger-
prints on the headlight bulb using a cloth
moistened with alcohol or thinner.
6. Install the headlight bulb holder by pushing it
in and turning it clockwise.
7. Install the headlight bulb holder cover.8. Connect the headlight coupler.
9. Install the headlight unit by installing the bolts.
10. Adjust the headlight beam if necessary.
EBU25550
Adjusting a headlight beam
CAUTION:

ECB00690
It is advisable to have a Yamaha dealer make
this adjustment.
To raise a headlight beam, turn the adjusting
screw in direction (a).
To lower a headlight beam, turn the adjusting
screw in direction (b).
1. Do not touch the glass part of the bulb.
1

1. Headlight beam adjusting screw
1(a)
(b)

10-4
1
2
3
4
5
6
7
8
910
11
Rear brake:

Type:
Single disc brake
Operation:
Right foot operation
Recommended fluid:
DOT 4
Front suspension:
Type:
Double wishbone
Spring/shock absorber type:
Coil spring/gas-oil damper
Wheel travel:
230 mm (9.1 in)
Rear suspension:
Type:
Swingarm (link suspension)
Spring/shock absorber type:
Coil spring/gas-oil damper
Wheel travel:
270 mm (10.6 in)
Electrical system:
Ignition system:
DC. CDI
Charging system:
AC magneto
Battery:
Model:
GT7B-4
Voltage, capacity:
12 V, 6.5 Ah
Headlight:
Bulb type:
Krypton bulb
Bulb voltage, wattage x quantity:
Headlight:
12 V, 30.0/30.0 W
×
2
Tail/brake light:
12 V, 0.5/3.9 W
×
1
Neutral indicator light:
12 V, 1.7 W
×
1
Coolant temperature warning light:
12 V, 1.7 W
×
1

Fuses:
Main fuse:
15.0 A

INDEX
A
Accessories and loading ................................................ 6-6
Air filter element, cleaning ............................................ 8-24
B
Battery .......................................................................... 8-45
Brake and clutch levers, checking and lubricating ....... 8-42
Brake and shift pedals, checking and lubricating ......... 8-43
Brake fluid, changing.................................................... 8-35
Brake fluid level, checking............................................ 8-32
Brake lever ..................................................................... 4-5
Brake lever free play, checking the front ...................... 8-36
Brake light switches ..................................................... 8-39
Brake pads, checking the front and rear ...................... 8-31
Brake pedal .................................................................... 4-5
Brake pedal position, checking .................................... 8-36
Brakes, front and rear .................................................... 5-4
C
Cables, checking and lubricating ................................. 8-41
Carburetor, adjusting.................................................... 8-29
Chassis fasteners........................................................... 5-8
Cleaning ......................................................................... 9-1
Clutch lever .................................................................... 4-5
Clutch lever free play, adjusting ................................... 8-39
Coolant ................................................................. 5-4
,
8-20
Coolant temperature warning light ................................. 4-1
D
Drive chain ..................................................................... 5-5
Drive chain, lubricating ................................................. 8-41
E
Engine break-in .............................................................. 6-5
Engine, cold start ........................................................... 6-1
Engine idling speed ...................................................... 8-30
Engine oil ....................................................................... 5-4
Engine oil and oil filter element .................................... 8-14
Engine, starting a warm ................................................. 6-3
Engine stop switch ......................................................... 4-2
F
Fuel ........................................................................ 4-8
,
5-4
Fuel cock ........................................................................ 4-9
Fuel tank cap.................................................................. 4-7
Fuse, replacing............................................................. 8-46
H
Handlebar switches ........................................................ 4-2
Headlight beam, adjusting............................................ 8-49
Headlight bulb, replacing.............................................. 8-47
I
Identification numbers .................................................. 11-1
Indicator light and warning light...................................... 4-1
Instruments, lights and switches .................................... 5-8
K
Key identification number ............................................. 11-1