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The spark plug is the device that creates the spark needed to ignite the fuel in your engine during combustion. Good spark plugs are essential for a machine to operate properly. Over time, spark plugs can become worn and will need to be replaced. If the engine is misfiring, if it is difficult to start, or if it will not start at all, the spark plugs might be the reason. Inspect the spark plug for corrosion. It is also possible to test the spark plugs using a multimeter. Changing out the sparkplugs is a fast and easy repair job. This genuine OEM spark plug 940 part will work for tillers, leave blowers, edgers, and trimmers. It is compatible with a range of different brands, including Ryobi, Troy-Bilt, Murray, MTD, Toro, Cub Cadet, and Craftsman.