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Check the compression! It has to be around 120 and no less then 100 to fire off. If it is ok, Have your carb checked out. It should fire off with some spray.
Most lawn mowers are magneto fired so no battery is necessary or even there to go bad! Flint?!
Take out the spark plug and see if it is oily or fuel soaked. Once a plug is fouled they wont spark anymore. Try cleaning the plug with a little carb cleaner and a wire brush. You can also get another plug and just try that. Otherwise you probably need another ignition coil. Good luck!
The plug is under the gas tank. They can be difficult to get to and you may have to remove/loosen the tank. If you can remove the spark plug wire you could test for spark. If you have a spark and it still doesn't crank the spark plug is probably the least of your worries unless you drained the tank and the carb (most people don't.)
If you have a spark give a spritz of starter fluid into the carb after removing the air filter and see if it runs for even a bit. If it does fire and doesn't run, clean the carb.
Good luck.
i would take the plug out and and the spark plug wire on the plug and try cranking it over and make the plug is firing if there is no fire then the ignition coil is dead but if you have fire then its a carb problem rarely ever a timing considering most mowers are timed with key ways which prevent them from jumping time.but if you have fire your good their but my overall suggestion is to rebuild the carb and swap out the spark plug if the mower has set for a period of 6 months or longer.
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