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Page 90 of 196

YAMAHA YZ250F 2011  Owners Manual 4-16
CAMSHAFTS
REMOVING THE CAMSHAFT
1. Remove:
• Timing mark accessing screw "1"
• Crankshaft end accessing screw 
"2"
2. Align:
• T.D.C. mark
With align mark.
Checking steps:
a. Turn the crank

Page 97 of 196

YAMAHA YZ250F 2011  Owners Manual 
4-23
VALVES AND VALVE SPRINGS
3. Inspect:• Valve facePitting/wear →Grind the face.
• Valve stem end
Mushroom shape or diameter 
larger than the body of the stem →
Replace.
4. Measure: • Mar

Page 98 of 196

YAMAHA YZ250F 2011  Owners Manual 
4-24
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 101 of 196

YAMAHA YZ250F 2011  Owners Manual 4-27
CYLINDER AND PISTON
2. Position:
• Piston ring
(in cylinder)
Insert a ring into the cylinder and 
push it approximately 10 mm (0.39 in) 
into the cylinder. Push the ring with 
the piston crown

Page 178 of 196

YAMAHA YZ250F 2011  Owners Manual 6-2
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
ELECTRICAL 
COMPONENTS AND 
WIRING DIAGRAM
ELECTRICAL COMPONENTS
1. Engine stop switch
2. Throttle position sensor
3. Neutral switch4. CDI magneto
5. Ignit

Page 181 of 196

YAMAHA YZ250F 2011  Owners Manual 6-5
IGNITION SYSTEM
2. Inspect:
• Charging coil 1 resistance
Out of specification→Replace.
3. Inspect:
• Charging coil 2 resistance
Out of specification→Replace.CHECKING THE NEUTRAL 
SWITCH
1.

Page 183 of 196

YAMAHA YZ250F 2011  Owners Manual 6-7
THROTTLE POSITION SENSOR SYSTEM
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 d

Page 184 of 196

YAMAHA YZ250F 2011  Owners Manual 6-8
THROTTLE POSITION SENSOR SYSTEM
8. Start the engine.
9. Adjust:
• Throttle position sensor output 
voltage
Adjustment steps:
a. Adjust the installation angle of the 
throttle position sensor "1"
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