Honda HS621 Owner's Manual page 7

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Gasoline is extremely flammable and is explosive under certain
conditions.
Do not smoke or allow flames or sparks where the snowthrower is
refueled or where gasoline is stored. Refuel in a well-ventilated area
with the engine stopped.
Do not overfill the fuel tank, and make sure the filler cap is closed
securely after refueling.
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Never run the engine in an enclosed or conffined area. Exhaust contains
poisonous carbon monoxide gas; exposure can. cause loss of
consciousness and may lead to death.
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The muffler becomes very hot during operation, and remains hot for a
while after stopping the engine. Be careful not to touch the muffler
while it is hot. Let the engine cool before storing the snowthrower
indoors.
NOTE:
While
operating the snowthrower, hold the handle firmly, and walk, don't
run. Wear suitable winter boots that resist slipping.
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