Yamaha YZ250F(W) Owner's Service Manual page 344

VALVES AND VALVE SPRINGS
5. Install:
NOTE:
• Apply the molybdenum disulfide oil on the
valve stem end.
• Apply the engine oil on the valve lifters.
• Valve lifter must turn smoothly when rotated
with a finger.
• Be careful to reinstall valve lifters and pads in
their original place.
4 - 42
• Adjusting pad 1
• Valve lifter 2
ENG