Honda F660 Manual De Explicaciones página 47

a. With the fuel valve turned OFF, remove and empty the fuel
strainer cup.
b. Turn the fuel valve ON and drain the gasoline from the fuel tank
into a suitable container.
c. Reinstall the fuel strainer cup and tighten securely.
d. Drain the carburetor by loosening the drain knob. Drain the
gasoline into a suitable container.
DRAIN KNOB
FUEL STRAINER CUP
3. Pull the starter grip until resistance is felt. Continue pulling until the
notch on the starter pulley aligns with the hole on the recoil starter.
At this point, the intake and exhaust valves are closed, and this will
help to protect the engine from internal corrosion.
4. Change engine oil and transmission oil.
5. Cover the tiller with plastic sheet.
Do not place the tiller with the handlebars on the ground. It will cause
the oil entering the cylinder or fuel will spill over.
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FUEL VALVE