A maintenance routine that includes servicing the spark plugs, air filter and engine oil helps keep your lawn mower running at peak performance.

Attach the spark plug to a spark plug tester, then connect the tester to the ignition wire. Start the engine and observe the ...

Hand-thread the spark plug back into the engine, being very careful not to cross the threads. Then tighten the spark plug, but don’t over-tighten it or it’ll crack.

Let's say you've just removed an old spark plug. Does it have any life left in it? Can it be reused if it is cleaned properly? Let's take a closer look.

Heat Range: A spark plug's heat range classifies how insulated the center electrode is from the spark plug threads, and thus, the cylinder head. The heat of combustion warms the spark plug tip ...

Having trouble with an engine that won't start or runs rough? A bad spark plug could be the culprit. Here's how to tell if you need to replace it.