Honda EM50is Manual De Explicaciones página 57

Before storing the unit for an extended period:
1.Be sure the storage area is free of excessive humidity and dust.
2.Drain the fuel.
Gasoline is extremely flammable and is explosive under certain 
conditions. Perform this task in a well ventilated area with the engine
stopped. Do not smoke or allow flames or sparks in the area during
this procedure.
a. Place a suitable gasoline container below the carburetor drain hose.
b. Turn the fuel valve lever to the ON position. Loosen the carburetor
drain screw and drain the gasoline from the fuel tank and 
carburetor.
c. After all the fuel has drained into the container, tighten the 
carburetor drain screw securely and turn the fuel valve to the OFF
position.
d. Remove the sediment cup, and empty it and reinstall.
3.Change the engine oil (see page 43).
4.Remove the spark plug and pour about a tablespoon of clean engine
oil into the cylinder. Crank the engine several revolutions to distribute
the oil, then reinstall the spark plug.
5.Slowly pull the starter grip until resistance is felt. At this point, the
piston is coming up on its compression stroke and both the intake
and exhaust valves are closed. Storing the engine in this position will
help to protect it from internal corrosion.
CARBURETOR
DRAIN SCREW
55