oil YAMAHA WR 250F 2011 Owner's Guide

YAMAHA WR 250F 2011 Owner's Guide WR 250F 2011 YAMAHA YAMAHA https://www.carmanualsonline.info/img/51/52313/w960_52313-0.png YAMAHA WR 250F 2011 Owner's Guide

Page 73 of 232

YAMAHA WR 250F 2011 Owners Guide 3-14
ENGINE
4. Clean:
• Air filter element
Clean them with solvent.
After cleaning, remove the remaining 
solvent by squeezing the element.
• Do not twist the element when 
squeezing the element.

Page 74 of 232

YAMAHA WR 250F 2011 Owners Guide 3-15
ENGINE
5. Remove:
• Oil hose clamp "1"
• Bolt (oil hose)
• Oil hose "2"
• Oil strainer "3"
6. Inspect:
• Oil strainer
Clogged→Blow.
7. If the oil filter is to be replaced dur-
ing thi

Page 75 of 232

YAMAHA WR 250F 2011 Owners Guide 3-16
ENGINE
ADJUSTING THE PILOT SCREW 
(For EUROPE)
1. Adjust:
• Pilot screw "1"
Adjustment steps:
To optimize the fuel flow at a smaller 
throttle opening, each machines pilot 
screw has been indi

Page 76 of 232

YAMAHA WR 250F 2011 Owners Guide 3-17
ENGINE
6. Adjust:
• Valve clearance
Adjustment steps:
a. Remove the camshaft (intake and 
exhaust).
Refer to "CAMSHAFTS" section 
in the CHAPTER 5.
b. Remove the valve lifters "1" and 
the pads

Page 82 of 232

YAMAHA WR 250F 2011 Owners Guide 3-23
CHASSIS
4. Inspect:
• O-ring "1" (drive chain)
Damage→Replace the drive 
chain.
•Roller "2"
• Side plate "3"
Damage/wear→Replace the 
drive chain.
5. Check:
• Drive chain stiffness "a

Page 83 of 232

YAMAHA WR 250F 2011 Owners Guide 3-24
CHASSIS
CLEANING THE FRONT FORK OIL 
SEAL AND DUST SEAL
1. Remove:
•Protector
• Dust seal "1"
Use a thin screw driver, and be care-
ful not to damage the inner fork tube 
and dust seal.
2. Cl

Page 87 of 232

YAMAHA WR 250F 2011 Owners Guide 3-28
CHASSIS
LUBRICATION
To ensure smooth operation of all 
components, lubricate your machine 
during setup, after break-in, and after 
every ride.
1. All control cable
2. Clutch lever pivot
3. Shift

Page 88 of 232

YAMAHA WR 250F 2011 Owners Guide 3-29
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 col

Page 92 of 232

YAMAHA WR 250F 2011 Owners Guide 3-33
ELECTRICAL
6. Install:
•Battery
• Battery band
7. Connect:
• Battery leads
(to the battery terminals)
First, connect the positive lead "1", 
then the negative lead "2".
8. Check:
• Batter

Page 98 of 232

YAMAHA WR 250F 2011 Owners Guide 4-5
CHASSIS
CHASSIS
SELECTION OF THE SECONDARY 
REDUCTION RATIO (SPROCKET)
<Requirement for selection of sec-
ondary gear reduction ratio>
• It is generally said that the second-
ary gear ratio shou