The purpose of the lawn mower carburetor is to make a blend of fuel and air that will combust to give your mower power. Carburetors can be adjusted to make different combinations of fuel and air, making the engine run faster and more powerfully, or conserve energy. A dirty carburetor will cause your mower engine to sputter and stop and in certain cases never start in the first place. Dirt can get into the carburetor from flying debris and can be contaminated by gasoline if you turn the mower in the wrong direction. To clean the carburetor, you first have to remove it.
Remove the deck of the lawn mower from the engine block by taking off any screw or bolts that hold it in place. Move the mower deck to the side.
Remove the nuts that hold the carburetor to the engine and take off the carburetor. Place the nuts in a safe place so you don't lose them.
Put on your safety glasses and lay down a thin sheet of newspaper to protect your eyes from gas, and keep gasoline off the work surface.
Remove the top bolt from your carburetor over the newspaper and separate the two sides. Wipe the inside of the bowl, which covers the inside of the carburetor and is in contact with gas, with an old rag.
Remove the plastic components from the carburetor, then spray both sides of the carb with the cleaner and rub away any dirt or rust with an old rag. Do not spray the plastic components, as this may cause decay.
Spray the plastic components and inside of the carburetor with the compressed air.
Replace the carburetor components and reassemble the mower in reverse order of how you took it apart.