only way to fix a spark plug is to replace the problem plug with a new one
Ordinary home lawnmowers have only one spark plug.
A typical lawnmower has a one-cylinder engine, with one spark plug.
only use AC Delco plugs, there the only one with the correct heat range.
bad spark plug wire.
I believe there is only one cylinder so it takes one spark plug
If there is only one plug, try removing the plug, spraying WD40 in the plug hole, replace the plug and try starting.
blown head gasket OR if in only one cylinder then maybe the plug was loose?
I've done it a few times on my 1996 Tacoma 2.4L engine. You need a 5/8" spark plug socket (3/8" drive preferably) with the foam rubber insert that holds the spark plug once it's loose. And a ratchet and extension (12" is enough I think). Then, one by one (for each spark plug), remove the spark plug wire, use the ratchet/extension/socket to remove the spark plug, reverse the process to install the new spark plug. One thing I ran into this last time was that the foam rubber insert in the spark plug socket held the spark plug more tightly than the socket was held on the end of the extension (it was a brand-new spark plug socket), so I had to back that first one out and only very gently push the replacement spark plug into the spark plug socket so the foam rubber insert barely held it enough to lower it down into the hole for the spark plug (through the valve cover).
How to Check a Car's Spark Plug Wires By eHow Cars Editor Part of car overhaul and car maintenance is checking your car's spark plug wires. These cables connect the spark plug to the distributor. You must check them every year and replace or clean them as needed. Always replace the entire set even if only one wire shows signs of wear. Difficulty: Moderately Easy 1. Turn off your car engine to overhaul your spark plug wires. Let your car cool down. Open the hood of your car and look inside for your spark plug wires. 2. Find the distributor. You will see several cables going across and ending at the individual spark plugs. These are the spark plug wires. 3. Remove one spark plug wire at a time for better inspection. Pop it off the spark plug and the distributor. Remove only one wire at a time. This will ensure you do not mix up the spark plug wires. 4. Look at the wire carefully. If it has any tears or cracks, you must replace it now. Always replace all spark plug wires at the same time even if only one needs replacement. 5. Clean a dirty spark plug wire. Use hand cleaner soap and wipe completely dry. Reinstall the spark plug wire into the distributor and connect to the spark plug. 6.Repeat this overhaul at least once a year. Remember to check the spark plug wires when you change your spark plugs. Tips & Warnings · Do not remove all of the spark plug wires at one time unless you are very sure you know which one goes where. If you mix them up, your car will not run. Remove one at a time then replace or reinstall it. Move on to the next one.
I've done it a few times on my 1996 Tacoma 2.4L engine. You need a 5/8" spark plug socket (3/8" drive preferably) with the foam rubber insert that holds the spark plug once it's loose. And a ratchet and extension (12" is enough I think). Then, one by one (for each spark plug), remove the spark plug wire, use the ratchet/extension/socket to remove the spark plug, reverse the process to install the new spark plug. One thing I ran into this last time was that the foam rubber insert in the spark plug socket held the spark plug more tightly than the socket was held on the end of the extension (it was a brand-new spark plug socket), so I had to back that first one out and only very gently push the replacement spark plug into the spark plug socket so the foam rubber insert barely held it enough to lower it down into the hole for the spark plug (through the valve cover).
Check the plug and the wire.