Yamaha WR250F Manuel D'atelier page 348

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VALVES AND VALVE SPRINGS
4 - 41
3. Install:
Valve cotter
NOTE:
While compressing the valve spring with a
valve spring compressor 1 install the valve
cotters.
Valve spring compressor:
YM-04019/90890-04019
4. To secure the valve cotters onto the
valve stem, lightly tap the valve tip with a
piece of wood.
CAUTION:
Hitting the valve tip with excessive force
could damage the valve.
5. Install:
Adjusting pad 1
Valve lifter 2
NOTE:
Apply the molybdenum disulfied 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.
ENG