Old filters can either become clogged by the debris that they have trapped, or they can lose their ability to hold these contaminants and allow them to circulate through the engine.

A lawn mower that idles or runs rough could be an indication of worn spark plugs. Install a new, properly gapped plug after 100 hours of operation or once a season—whichever comes first.

Rotary Corp. Available for popular lawn mower brands, each kit features up to 10 items such as an air filter, pre-filter, oil filter, fuel filter, hose clamps, spark plugs and motor oil.