2008 YAMAHA YZ450F Owners Manual

Page 65 of 188

YAMAHA YZ450F 2008  Owners Manual 3-19
CHASSIS
• STANDARD POSITION:
This is the position which is back 
by the specific number of clicks 
from the fully turned-in position. 
(Which align the punch mark "a" 
on the adjuster with the

Page 66 of 188

YAMAHA YZ450F 2008  Owners Manual 3-20
CHASSIS
3. Check:
• Steering smooth action
Turn the handlebar lock to lock.
Unsmooth action
→Adjust steer-
ing ring nut.
4. Adjust:
• Steering ring nut
Steering ring nut adjustment 
steps:

Page 67 of 188

YAMAHA YZ450F 2008  Owners Manual 3-21
CHASSIS
LUBRICATION
To ensure smooth operation of all 
components, lubricate your machine 
during setup, after break-in, and after 
every race.
1. All control cable
2. Clutch lever pivot
3. Shift

Page 68 of 188

YAMAHA YZ450F 2008  Owners Manual 3-22
ELECTRICAL
ELECTRICAL
CHECKING THE SPARK PLUG
1. Remove:
• Spark plug
2. Inspect:
• Electrode "1"
Wear/damage
→Replace.
• Insulator color "2"
Normal condition is a medium to 
light tan co

Page 69 of 188

YAMAHA YZ450F 2008  Owners Manual 4-1
SEAT, FUEL TANK AND SIDE COVERS
ENGINE
SEAT, FUEL TANK AND SIDE COVERS
REMOVING THE SEAT, FUEL TANK AND SIDE COVERS
Order Part name Qty Remarks
Turn the fuel cock to "OFF".
Disconnect the fuel ho

Page 70 of 188

YAMAHA YZ450F 2008  Owners Manual 4-2
SEAT, FUEL TANK AND SIDE COVERS
REMOVING THE SIDE COVER
1. Remove:
• Bolt (side cover)
• Left side cover "1"
• Right side cover "2"
Draw the side cover downward to re-
move it because its cl

Page 71 of 188

YAMAHA YZ450F 2008  Owners Manual 4-3
EXHAUST PIPE AND SILENCER
EXHAUST PIPE AND SILENCER
REMOVING THE EXHAUST PIPE AND SILENCER
Order Part name Qty Remarks
Right side coverRefer to "SEAT, FUEL TANK AND SIDE 
COVERS" section.
1 Bolt

Page 72 of 188

YAMAHA YZ450F 2008  Owners Manual 4-4
EXHAUST PIPE AND SILENCER
CHECKING THE SILENCER AND 
EXHAUST PIPE
1. Inspect:
• Gasket "1"
Damage
→Replace.
CHANGING THE SILENCER FIBER
1. Remove:
• Rivet (front) "1"
• Inner pipe "2"
Take