2008 YAMAHA WR 450F light

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Page 54 of 224

YAMAHA WR 450F 2008  Owners Manual 2-27
CABLE ROUTING DIAGRAM
1. Throttle cable
2. Clamp
3. Brake hose
4. Clutch cable
5. Hose guide
6. Main switch coupler
7. Wire harness
8. Headlight coupler
9. Hot starter cable
10. Multi-function di

Page 61 of 224

YAMAHA WR 450F 2008  Owners Manual 3-6
ENGINE
ENGINE
REMOVING THE SEAT, FUEL TANK AND SIDE COVERS
Order Part name Qty Remarks
Turn the fuel cock to "OFF".
Disconnect the fuel hose.
1Seat 1
2 Air scoop (left and right) 2
3 Bolt (fuel t

Page 67 of 224

YAMAHA WR 450F 2008  Owners Manual 3-12
ENGINE
5. Inspect:
• Air filter element
Damage→Replace.
6. Apply:
• Foam-air-filter oil or equivalent oil 
to the element
• Squeeze out the excess oil. Ele-
ment should be wet but not dri

Page 68 of 224

YAMAHA WR 450F 2008  Owners Manual 3-13
ENGINE
• Do not add any chemical addi-
tives or use oils with a grade of 
CD "a" or higher.
• Do not use oils labeled "ENERGY 
CONSERVING II" "b" or higher. 
Engine oil also lubricates the 
c

Page 69 of 224

YAMAHA WR 450F 2008  Owners Manual 3-14
ENGINE
ADJUSTING THE PILOT SCREW
1. Adjust:
• Pilot screw "1"
Adjustment steps:
To optimize the fuel flow at a smaller 
throttle opening, each machines pilot 
screw has been individually set a

Page 72 of 224

YAMAHA WR 450F 2008  Owners Manual 3-17
CHASSIS
CLEANING THE SPARK 
ARRESTER (For USA)
• Be sure the exhaust pipe and si-
lencer are cool before cleaning 
the spark arrester.
• Do not start the engine when 
cleaning the exhaust sys

Page 79 of 224

YAMAHA WR 450F 2008  Owners Manual 3-24
CHASSIS
CHECKING THE TIRE PRESSURE
1. Measure:
• Tire pressure
Out of specification→Adjust.
• Check the tire while it is cold.
• Loose bead stoppers allow the tire 
to slip off its positi

Page 80 of 224

YAMAHA WR 450F 2008  Owners Manual 3-25
CHASSIS
• The handlebar upper holder should 
be installed with the punched mark 
"a" forward.
• Install the handlebar so that the 
marks "b" are in place on both 
sides.
• Install the handl
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