Connected to small engines to provide power, this spark plug ignites fuel and air inside of a combustion chamber, which drives a piston down and makes the engine start. This spark plug is designed to have superior corrosion resistance, dependable performance, and is resistant to fouling. It has a high level of heat control and conductivity for excellent overall wear. Inspecting the spark plug is something that should be done after every 10 or 15 hours of use. Brown deposits may be present and there should be a gap between the electrodes of about 0.02 inches. A thick black deposit might mean that the air and oil mixture is too rich, while a large gap indicates a thin mixture. If oil is seen on the plug, this might mean there is an oil leak. Test the spark plug if your engine is stalling to determine whether it needs to be replaced. This is an individual OEM product provided directly from the manufacturer. The Champion spark plug can be used in various tools, including chainsaws, tillers, leaf blowers, pole pruners, and string trimmers by Green Machine, Toro, Homelite, and Ryobi.