The carburetor in a Husqvarna engine regulates the flow of fuel into the combustion chamber. It pulls fuel in, mixes it with air and then pushes it off to the combustion chamber. Without the carburetor, a Husqvarna wouldn't start or run. Furthermore, dirty carburetors cause a majority of all problems on any combustion engine, including Husqvarna's. Cleaning the carburetor requires complete disassembly and rebuilding of the carburetor; if this is done improperly, major engine damage can occur.
Unscrew all of the screws holding the bottom plate to the carburetor. Remove the bottom plate, and pull off the gasket and diaphragm. Slowly separate the metering gasket and diaphragm if they're stuck together.
Unscrew the needle valve screw, and take out the needle valve, lever arm and spring. Hold your thumb over the spring area to prevent it from flying off once the screw is removed. Unscrew the primer bulb if your Husqvarna has one attached to the carburetor.
Take off the primer base and the carburetor's reed valve. Unscrew the cover of the fuel pump if your Husqvarna has one. Take off the fuel pump cover, gasket and diaphragm. Separate the fuel pump gasket and diaphragm carefully.
Soak the carburetor parts in a bath of carburetor cleaner overnight. Gently brush off any caked-on grease and dirt.
Blow out the carburetor's valves with the compressed air. Rebuild the carburetor with the carburetor rebuild kit. Replace all of the diaphragms and gaskets.