Why replacing your Lawn Mower spark plug?
For consistent, easy starting, you need to change your Lawn Mower spark plug every 100 hours or at least every season, whichever comes first. Replacing your spark plug:
Give a more reliable start (also after winter), Gives less fuel consumption and Ensures a consistent spark.
Step 1: Remove the existing spark plug on your Lawn Mower
1. Disconnect the spark plug cap. Then, clean the area around the spark plug to avoid getting debris in the combustion chamber when you remove the plug. This is can be done by blowing the dirt out of the area by pressurized air, or cleaning spray.
2. Remove the spark plug using a spark plug socket.
3. Clean light deposits from the spark 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.
4. Inspect the spark plug for very stubborn deposits, or for cracked porcelain or electrodes that have been burned away. If any of these conditions exists, replace the spark plug.
Step 2: Put in new spark plug on your Lawn Mower
A. Use a spark plug gauge to measure the gap between the two electrodes (one straight, one curved) at the tip of your spark plug. Most Small Engines require a .030″ gap. Check for the exact specifications for your model in the operators manual of your equipment.
B. If necessary, use a spark plug gauge to adjust the gap by gently bending the curved electrode. When the gap is correct, the gauge will drag slightly as you pull it through the gap.
C. Reinstall the plug, taking care not to over-tighten (15 ft. lbs. MAXIMUM ). Then, attach the spark plug cap.
Your Lawn Mower will run as new! Want to find out more on? How to check your Lawn Mower spark plug
André, The Small Engine Troubleshooter, advise to at least change the spark plug once a year, how do you think about this? More often? Or do you think it is not needed? Let me know here
With special thanks to http://www.briggsandstratton.com/Yardsmarts/Equipment%20Know-How/Lawn%20Mower%20Tune-Up/Changing%20Spark%20Plugs/