Honda and WT40X Owner's Manual page 25

OPERATION
3. Turn the fuel valve lever to the OFF position.
' v-
OFF
After use, remove the case and cover drain plugs (see page42), and
drain the pump chamber. Remove the filler cap, and flush the pump
chamber with clean, fresh water. Allow the water to drain from the
pump chamber, then reinstall the filler cap and drain plug.
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