2014 YAMAHA WR 250F check engine

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Page 108 of 230

YAMAHA WR 250F 2014  Owners Manual 5-7
CARBURETOR
HANDLING NOTE
Do not loosen the screw (throttle 
position sensor) "1" except when 
changing the throttle position sen-
sor due to failure because it will 
cause a drop in engine perfor-

Page 118 of 230

YAMAHA WR 250F 2014  Owners Manual 5-17
CAMSHAFTS
4. Measure:
• Camshaft-to-cap clearance
Out of specification→Measure 
camshaft outside diameter.
Measurement steps:
a. Install the camshaft onto the cylin-
der head.
b. Position a s

Page 125 of 230

YAMAHA WR 250F 2014  Owners Manual 5-24
VALVES AND VALVE SPRINGS
h. Press the valve through the valve 
guide and onto the valve seat to 
make a clear pattern.
i. Measure the valve seat width 
again. If the valve seat width is out 
of s

Page 128 of 230

YAMAHA WR 250F 2014  Owners Manual 5-27
CYLINDER AND PISTON
a. 10 mm (0.39 in)
3. Measure:
• Ring end gap
Out of specification→Replace.
You cannot measure the end gap on 
the expander spacer of the oil control 
ring. If the oil con

Page 132 of 230

YAMAHA WR 250F 2014  Owners Manual 5-31
CLUTCH
REMOVING THE CLUTCH BOSS
1. Remove:
•Nut "1"
• Lock washer "2"
• Clutch boss "3"
Straighten the lock washer tab and 
use the clutch holding tool "4" to hold 
the clutch boss.
A. For

Page 141 of 230

YAMAHA WR 250F 2014  Owners Manual 5-40
BALANCER
REMOVING THE BALANCER
1. Straighten the lock washer tab.
2. Loosen:
• Nut (primary drive gear) "1"
• Nut (balancer shaft driven gear) 
"2"
Place an aluminum plate "a" between 
the te

Page 144 of 230

YAMAHA WR 250F 2014  Owners Manual 5-43
OIL PUMP
CHECKING THE OIL PUMP
1. Inspect:
• Oil pump drive gear "1"
• Oil pump drive shaft "2"
• Rotor housing "3"
• Oil pump cover "4"
Cracks/wear/damage→Replace.
2. Measure:
• Tip

Page 162 of 230

YAMAHA WR 250F 2014  Owners Manual 5-61
CRANKCASE AND CRANKSHAFT
DISASSEMBLING THE 
CRANKCASE
1. Separate:
• Right crankcase
• Left crankcase
Separation steps:
a. Remove the crankcase bolts "1", 
hose guide "2" and clutch cable 
ho