Yamaha F2.5A Owner's Manual page 96

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1) Wash the motor body using fresh water.
(Refer to "MOTOR EXTERIOR".)
2) Remove the grommet 1.
3) Place a container under the carburetor
drain hole to catch the gasoline, and
then loosen the drain screw.
4) Place the fuel cock in the CLOSED posi-
tion.
5) Tighten the air vent screw.
6) Drain the cooling water completely out
of the motor.
7) Clean the body thoroughly.
GB