Honda HSS724A Owner's Manual page 58

STORAGE
Adding a Fuel Stabilizer to Extend Fuel Storage Life
When adding a fuel stabilizer, fill the fuel tank with fresh gasoline. If
only partially filled, air in the tank will promote fuel deterioration during
storage. If you keep a container of gasoline for refueling, be sure that it
contains only fresh gasoline.
Add fuel stabilizer following the manufacturer's instructions.
After adding a fuel stabilizer, run the engine outdoors for 10 minutes to
be sure that treated gasoline has replaced the untreated gasoline in the
carburetor.
Service according to the table below:
STORAGE TIME
Less than 1 month
1 to 3 months
More than 3 months
56
RECOMMENDED SEVICE PROCEDURE TO
PREVENT HARD STARTING
Fill with fresh gasoline to prevent moisture
buildup.
Fill with fresh gasoline and add gasoline stabilizer
according to the manufacturers instructions.
With the fuel valve in the OFF position, start the
engine and let run until the engine stops.
Drain the fuel tank and carburetor (page 57).