Set the engine on a flat work bench. Put on work gloves. Twist off the screw securing the air filter cover located on the right side of the engine. Slide off the air filter cover and air filter. This will expose the intake into the carburetor. Place a small piece of paper towel into the carburetor intake. This is to avoid getting dirt into the fuel system.
Remove the hex bolts holding down the plastic engine housing. Depending on the model it will have four to six bolts. Slide the housing off the engine. Remove any dirt or build-up you can with your hands.
Spray carburetor cleaner over any part of the engine showing dirt or build-up.
Start the air compressor and attach the air gun. Shoot air onto the engine until all the dirt is removed. Once the engine is dry, attach the plastic engine housing, and tighten down the housing with the hex bolts. Remove the paper towel from the carburetor intake; slide back in the air filter and cover; twist the screw back in that holds the cover on.