Yamaha WR250F(N), Owner'S Service Manual

Page: 204 / 686

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INSP
ADJ
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)