Remove the spark plug using your spark plug socket. Clean the spark plug by wiping with a clean, dry rag. If most of the dirt stays on, you should consider replacing the plug. A new one is inexpensive, but take the old one with you to make sure you get the right one. Use your spark plug gapping tool to set the gap between the two electrodes at the base of the plug for .030. You do this by gently bending the outer electrode up or down with the gapping tool. Now the spark plug is ready to go back in.

Do not over tighten the spark plug when you put it back in. Screw it in until it makes contact with the engine and then give it another quarter turn with your wrench.

Ok, the other thing that needs to be done is to remove the blade to have it checked for defects, sharpened, balanced, and reinstalled. There are serious safety issues involved when it comes to the blade. It needs to be serviced correctly, and this is best left to a professional. It’s better to spend a few dollars than losing a toe or a foot. If you don't want to have this done in the fall, do it in the spring.

Water from rain or melting snow can seep into the gas tank through the tank's vent holes, so store your mower and other equipment in a dry place. As an alternative, securely cover the machine with a tarp.

Now your mower is ready for next season. Come spring all you need to do is add gas and cut some grass.

Note: The author is not responsible for any personal injury or damage caused by following the above. Readers follow the above advice at their own risk.