Turn the snow thrower off and allow it to thoroughly cool down before attempting to drain the unit.
Drain the snow thrower of excess fuel left inside of the engine over a clean drain pan. Store the fuel in a safety-approved metal container that is marked "flammable" Avoid storing the fuel and snow thrower in buildings or areas that have open flames or sparks that can cause a fire.
Fire up the engine and allow the snow thrower to run and sputter out to a complete stop to clear the engine of fuel. Push the choke down on the unit once it begins to sputter to clear the carburetor of any remaining fuel.
Pull out the spark plug located over the cylinder head on the snow thrower. Measure out 1 oz. of 5W-30 weight engine oil, pour it into the opening and place a cloth over the hole. Lubricate the cylinder by slowly pulling the recoil starter on the unit. Replace the spark plug in the snow thrower.
Remove the ignition key from the snow thrower and store it in a safe place you can easily access once you need it again.
Clean exposed areas of the snow thrower with a heavy towel to remove all dirt, mud and debris. Dry the exterior well with a clean, dry cloth.
Rustproof your snow thrower before storing it in a metal building or unventilated area by lightly oiling the equipment with a silicone lubricant. Lubricate any bearings, cables, springs or chains and add a light coating to the outside unit as well with a clean, soft cloth.
Store the machinery in a dry building or shed. Cover the unit with a clean tarp to keep it safe from settling dust or accidental building leakage.