The spark plug is what makes it possible for your lawnmower’s engine to ignite the gasoline during the agitation process. And while a clean spark plug allows for easy starting and effective engine operation, a spark plug that’s old, dirty or fouled won’t be able to pass the needed spark for the combustion process within the engine’s cylinder. If your favorite mower is difficult to start, a worn-out spark plug may be the culprit.
What Size Spark Plug Socket For Lawn Mowers?
13/16 and 3/4 in. spark plugs are the most common.
How To Use A Spark Plug Socket For Changing Spark Plug
Step 1: Remove the existing spark plug
- Disconnect the spark plug lead. Then, clean the area around the spark plug to avoid getting debris in the combustion chamber when you remove the plug.
- Remove the spark plug using a good spark plug socket.
- Clean light deposits from the plug with a wire brush and spray-on plug cleaner. Then, use a sturdy knife if necessary to scrape off tough deposits. NOTE: Never clean a spark plug with a shot blaster or abrasives.
- Probert plug for very stubborn deposits, or for cracked porcelain or electrodes that have been burned away. If any of these conditions exist, replace the spark plug.
Step 2: Put the new spark plug
- Use a spark plug gauge to determine the gap between the two electrodes (one straight, one curved) at the tip of your spark plug Many small engines need a .030″ gap. Check for the specifications for your model.
- if necessary, use a spark plug gauge to adjust the gap by smoothly changing the curved electrode. And when the gap is correct, the gauge will move slightly as you pull it through the gap.
- Again Reinstall the plug, taking care, not to over-tighten (15 ft. lbs. maximum). Then, attach the spark plug lead.