Here's the scenario. Your small engine won't start, or it starts but runs rough. You're using fresh gas, the spark plug looks fine, and the air filter is clean. You've decided the likely culprit is a clogged carburetor.
The purpose of a carburetor is to mix the fuel with air so that it can be atomized before it enters the engine. If any of the tiny passageways that run through the inside of the carburetor become clogged, it's time to give it a good cleaning.
Check the Float
Before you fully take apart the carburetor for cleaning, it is a good idea to check the float inside the bowl. If your engine is prone to flooding, the float and the needle in the bowl may be the problem. To remove the bowl, make sure the fuel petcock is in the off position and then remove the bolt at the bottom.
Make sure the float can pivot freely. Remove the pivot pin to remove the float and needle. Over time, the rubber tip on the needle can harden and fails to make a good seal against the seat. Also, the little spring that pushes up on the needle can become gummed up and frozen.
Carb Cleaner and Bristle Brushes
The easiest way to clean a carb is to spray it heavily with cleaner. Wear gloves and eye protection when using the spray, and only use the spray in a well-ventilated place.
A nylon-bristle brush also works well for removing grime in all the nooks and crannies. Also, once you remove the jets, a guitar string is helpful for getting into those very tiny holes.
Be sure to watch the video as Jared demonstrates how to break down a carburetor, clean it, and reassemble it.