Hello Thomas, I'm sorry you are having this problem with the mower. First, if this was a new purchase, most mowers will have a 2 yr. warranty and I would suggest having this serviced by a technician under the warranty. However, by the partial model listed, it shows to be an older model that is more than 2 yrs. In this case, make sure to use fuel that is less than 5 weeks old. Gas will start to break down and become less volatile. If the gas is old, drain the tank refill with fresh fuel. Check the air filter and replace it if is not dry or clean. If the engine does not start, you need to determine what is causing the problem. The engine needs three things to start and they are fuel compression and spark. Use the following instructions to determine what is missing.
The first check is going to be if the engine is getting spark. Remove the spark plug from the engine and connect it to the spark plug wire. Use a pair of insulated pliers to the base of the spark plug against a metal part of the engine. Now have someone pull the starter rope. When the engine is turning over you should see the spark plug spark. If the plug does not spark, disconnect the spark plug and insert a screwdriver into the boot of the spark plug wire. Make sure to hold onto the handle of the screwdriver. Hold the metal portion of the screwdriver close to a bare metal part of the engine. Now pull the starter rope again with the starter. If you see a spark, you need to replace the spark plug. If you do not see, a spark most likely the ignition coil is defective.
Once you have determined the engine has spark you have to check for fuel. The easiest way to check for a fuel problem is to remove the air filter and pour a teaspoon of fuel mix into the throat of the carburetor. Then try to start the engine. If the engine acts as if it wants to start or runs for a short time and stalls the problem with the engine is a fuel issue. Most likely, the carburetor does have some build up from old gas that remained in the carburetor over the winter.
If the engine did not attempt to start with pouring the gas in the carburetor, I recommend checking the compression of the engine. To check the compression, remove the spark plug and tuck the wire out of the way. Hold your finger over the spark plug hole and pull the starter rope. When the engine turns over the compression should force air past your finger. If the engine does not force air out part your finger there is an internal engine problem. If you do not feel confident repairing this problem yourself, then you can call 1-800-469-4663 to have it repaired by a Sears technician or to locate the nearest repair center. I hope this will help you.