One of the most frustrating problems that occurs when pulling out your lawnmower to cut your unruly lawn is that it refuses to start. Often, this is due to a faulty ignition system, which can be quite difficult to repair if you don’t know what you’re doing. Follow these instructions to check all of the components associated with your lawnmower’s ignition and to isolate the problem:

Step 1: Give your lawn mower to give a quick check over to make sure that the switch is turned to the “on” or “run” position, that there is fuel in the tank and that the engine is turning over when you turn the key or pull the cord. If this doesn’t solve the problem, read on.

Step 2: Unscrew the spark plug and check it for carbon buildup. Give the plug a good clean using a cloth and a wire brush, then use a spark plug checker to test if it is sparking correctly. No spark or a weak yellow spark means that the ignition system is not providing enough power. A blue spark means that it is.

Step 3: Carefully inspect the battery and wiring if the lawnmower still will not start. The battery could be dead, it could have corroded posts, or it could have faulty wiring.

Step 4: Use your owner’s manual to determine where the kill switches are located on your lawnmower. Then, check that these circuits are intact and are functioning correctly. If not, it is likely that a faulty circuit has tripped the kill switch and is preventing you from starting your lawnmower.

If none of the above steps have resulted in you being able to start your lawnmower, you may want to check the fuel system and filters for signs of any blockages. These could prevent that engine from receiving an adequate fuel or air supply, therefore causing it to not start.