HUSQVARNA 223L 24cc Motor Gas Line Grass Weed String Trimmer - Refurbished Auto return stop switch - Stop switch automatically resets to the ON position for easier starting. Air Purge - Removes air from carburetor and fuel system for easy starting. Smart Start - The engine and starter have been designed so the machine starts quickly with minimum effort. Three-piece crankshaft - Forged three-piece crankshaft for maximum durability for the toughest applications. Bump Feed