This DIY riding mower repair guide gives step-by-step instructions for replacing the spark plug on your riding lawn mower. You'll notice the engine runs rough or is hard to start if it has a broken or fouled spark plug. To keep the mower running smoothly, replace the spark plug once a year, or as often as your owner's manual specifies. Replace the spark plug with a manufacturer-approved riding lawn mower part if it's fouled or the ceramic insulator is cracked.
Use the procedure in this repair guide and video to replace the spark plug in Craftsman, Husqvarna, Murray, MTD, Toro, Troybilt and Ariens riding mowers and tractors.
