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How to Tune Up a Lawn Mower

By Benjamin Hardy
5/6/2014 1:50:07 PM

A well-maintained lawn mower is easier to operate and will last longer.

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Step 1: Remove the spark plug boot and spark plug.

Locate the spark plug boot and remove it, exposing the spark plug. Use a deep spark plug socket and ratchet to loosen the spark plug by turning it counterclockwise. Once it is loose, remove the spark plug by hand.

Use a ratchet and deep spark plug socket to loosen the spark plug.

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Step 2: Replace the spark plug.

Use a replacement spark plug that is identical to the old one. Set the spark plug gap by using a spark plug feeler gauge. Set the gap according to the owner manual's recommendation. Install the spark plug, turning clockwise by hand. Finish turning with a socket. Once the spark plug is seated, give it one half turn more. Replace the spark plug boot, pressing until you hear a "click."

Set the gap with a spark plug feeler gauge.

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Step 3: Prepare the mower to clean by laying it on the ground, exposing the underside.

Remove the spark plug cover to prevent the engine from starting. Position a pan to collect any oil that might drip from the oil breather vent. Turn the mower on its side. Rest a block of wood against the grass shoot and turn the blade to rest against the block to prevent it from moving.

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