2008 YAMAHA WR 250F light

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Page 61 of 224

YAMAHA WR 250F 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 68 of 224

YAMAHA WR 250F 2008  Owners Manual 3-13
ENGINE
4. Remove:• Engine guard "1"
• Bolt (oil tank) "2"
• Washer "3"
• Oil filler cap "4"
• Oil tank drain bolt "5"
• Crankcase oil drain bolt "6"
• Oil filter element drain bolt

Page 69 of 224

YAMAHA WR 250F 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 at

Page 72 of 224

YAMAHA WR 250F 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 syst

Page 79 of 224

YAMAHA WR 250F 2008  Owners Manual 3-24
CHASSIS
Do not force the adjuster past the 
minimum or maximum extent of 
adjustment. The adjuster may be 
damaged.
CHECKING THE TIRE PRESSURE
1. Measure:• Tire pressure
Out of specification

Page 80 of 224

YAMAHA WR 250F 2008  Owners Manual 3-25
CHASSIS
g. Check the steering stem by turn-ing it lock to lock. If there is any 
binding, remove the steering stem 
assembly and inspect the steer-
ing bearings.
h. Install the washer "5", collar

Page 81 of 224

YAMAHA WR 250F 2008  Owners Manual 3-26
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 82 of 224

YAMAHA WR 250F 2008  Owners Manual 3-27
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 colo
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