If your lawnmower is running rough or is hard to start, it is likely that the spark plug is bad. Use a spark plug wrench to replace the plug in a few minutes.Know More
Most mowers use plug wires that attach through a round metal cylinder that fits over the metal end of the plug. Pull the wire straight out from the engine to remove the electrode.
Prevent debris from falling into the hole by using a small brush to sweep it away before removing the plug.
Generally, plugs require a 13/16-inch or a 3/4-inch wrench. Place the wrench over the plug, and turn counterclockwise to loosen and remove it.
Replace the plug if it has broken porcelain or a burned electrode. Change the plug at the beginning of each mowing season or after every 100 hours of use.
Use a wire feeler gauge to check the plug gap. Most small engines require a 0.3-inch gap. You should feel a slight drag as you pull the wire through the plug gap. Use the prongs on the feeler gauge to adjust the electrode if necessary.
Insert the new plug into the hole and turn clockwise to tighten. Once the plug becomes snug, tighten another one-quarter turn. Push the plug wire onto the plug.
Briggs and Stratton recommends checking the fuel levels, air filter and spark plug as initial troubleshooting steps when a lawn mower won't start or won't stay running. Changing the cutting height on the lawn mower blade, replacing the flywheel key, or replacing the blade may be necessary in some situations.Full Answer >
To fix a lawn mower that is stalling during use, check the spark plug wire, replace the spark plug and clean the air screen and air filter. Drain and replace the fuel to ensure a contaminate is not causing the machine to stall, and then clean the blades thoroughly before using the lawn mower.Full Answer >
To troubleshoot a Toro lawn mower, check the fuel, spark plug, air filter and battery. If troubleshooting doesn't work, contact Toro for repair service. You may need replacement parts depending on the nature of the problem, and a computer with an Internet connection is helpful. The estimated time for completion is one to two hours.Full Answer >
A spark plug socket is a specialized, deep-length socket designed to fit over the plug terminal and insulator while it grips the hex nut for removal. Most spark plug sockets come in two sizes: 5/8 inches and 13/16 inches, accommodating standard spark plug brands such as Bosch, Champion and NGK.Full Answer >