Yamaha TT-R125P Manuel D'atelier Du Proprietaire page 270

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VALVES AND VALVE SPRINGS
4 - 31
3. Install:
Valve cotters 1
NOTE:
While compressing the valve spring with a
valve spring compressor 2, install the valve
cotters.
Valve spring compressor:
YM-4019/90890-04019
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.
ENG