Yamaha YZ250F Owner's Service Manual page 72

VALVE CLEARANCE INSPECTION AND ADJUSTMENT
3. Remove:
• Right radiator
Refer to "RADIATOR" section in the
CHAPTER 4.
• Carburetor
Refer to "CARBURETOR" section in the
CHAPTER 4.
• Spark plug
• Upper engine bracket
• Cylinder head cover
Refer to "CAMSHAFTS" section in the
CHAPTER 4.
4. Remove:
• Timing mark accessing screw 1
• Crankshaft end accessing screw 2
• O-ring
5. Check:
• Valve clearance
Out of specification → Adjust.
Valve clearance (cold):
Intake valve:
0.10 ~ 0.15 mm
(0.0039 ~ 0.0059 in)
Exhaust valve:
0.17 ~ 0.22 mm
(0.0067 ~ 0.0087 in)
3 - 19
INSP
ADJ