Walk-Behind Lawn Mower: Needs a tune-up

A mower tune-up includes changing the oil, cleaning or replacing the air filter, replacing the spark plug and replacing the blade if necessary. For instructions, see the repair guides below.

If your mower won't start, performing a tune-up can help. If you can't start the mower even after doing the tune-up, follow the tips in the troubleshooting videos below to get the engine started.

Troubleshooting Videos:

These repairs may help solve your Walk-Behind Lawn Mower problem:

Tune up a lawn mower

Air filter

Tune up a walk-behind mower to prevent engine wear and improve its efficiency. A walk-behind mower tune-up includes changing the oil, spark plug and air filter. It could also include sharpening or replacing the blade.

For manuals, repair guides, and specific part recommendations, enter your model number.

Replace a lawn mower spark plug

Spark plug

The spark plug gets electrical current from the ignition coils and sparks to ignite the fuel mixture in the cylinder, which drives the piston. The spark plug won't spark if it's coated with carbon deposits or oil residue, or if there’s a crack in the ceramic insulator. The engine won't start if the spark plug is bad. Replace the spark plug if it's damaged or coated with residue.

For manuals, repair guides, and specific part recommendations, enter your model number.

Replace a lawn mower blade

Blade

For safety and for a cleaner cut, replace a mower blade that's bent, chipped, broken or otherwise damaged.

For manuals, repair guides, and specific part recommendations, enter your model number.

Change a lawn mower oil and air filter

Oil

You should change your lawn mower's oil every 50 hours and before storing the machine in the fall. Over time, heat and friction break down the oil's ability to lubricate moving parts; changing the oil can help extend engine life. Change or clean the air filter, depending on your model; as it becomes clogged, it works less efficiently.

For manuals, repair guides, and specific part recommendations, enter your model number.