This video from Sears PartsDirect shows how to rebuild a carburetor on a lawn mower. Located on the side of the engine block, the carburetor mixes air with fuel to form a combustible mixture that enters the cylinder and ignites to drive the piston. The engine won't start or won't run smoothly if the carburetor gets clogged or the seals wear out. Rebuild the carburetor if the engine won't start or runs rough. Visit us at: http://www.searspartsdirect.com/?sid=soc:fb:rebuilding-the-carburetor-on-a-