The spark plugs on push mowers are usually easy to access - in many cases, you just remove the wire from the top of the spark plug, unscrew the spark plug, put the new one in, and cap it off with the wire again.
I own a John Deere 1458 mower and it takes an NGK plug #BPR5ES.
take the old plug to a mower parts store & tell them you need a matching one for a push mower
youtube - push mower oil change.... oil plug under mower deck
No spark, no gas, timing off [sheared keyway] remove plug attach wire lay on motor crank it, do you have spark? put a small amount of gas into spark plug hole, replace plug, doe,s it start? misfires ? replace keyway , under flywheel, Where I come from a push mower does not have an engine so it starts when you do.
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Start by checking your spark if you don't have spark check the spark plug. If the spark plug is ok then check your flywheel - It may have rust on it. Clean it up and clean up your coil and see if you have spark. If you still don't have spark change your coil. If it has spark and no fuel - clean your carb.
I have a push mower with a 4.5 horse on it and it uses a champion j19lm.
Remove the spark plug and try to pull start it. With the spark plug out try to manually rotate the blade. If the blade rotates, the mower is not locked up. It is possible there is something wrong with the recoil starter. Sometimes the float in the carburetor gets stuck open and gas will fill the cylinder, this will not allow you to pull the starting rope. With the spark plug removed pull the starting rope hard this will push out any excess fuel in the cylinder. Put the spark plug back in and try to start it.
The spark plug wires on your 1994 Chevrolet Caprice are quite easy to change. The spark plug wires simply lift off on each end. Put the new spark plug wires on and push until you feel a click.
There is a "Flywheel" inside the motor that has a large magnet on it. This magnet passes a "Magneto" and that passing (EMF, Electro-motive force) causes a high voltage charge to provide power to the plug.
If it's the metal bar near the spark plug that you push towards the plug to kill it, all it does is ground out the plug, making it not spark. That bar is connected to the frame of the mower ie grounded which in turn grounds out the plug and wire
Find a drain plug or turn it on it side and dump the oil out.