Thank you for asking your question on Just Answer. :-Could you explain your situation a little more?
Is the engine turning over but not attempting to start?
Will it try to start if you add fuel to the carburetor?
Please pull the spark plug and see if it is getting spark.
Let me know and if the spark plug is now oil fouled. Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.
To check for spark pull the plug wire off the plug, and position the wire so that there is a small gap between the wire and the top of the plug. Pull the starter cord. A visible spark should jump between the wire and plug. If you don't see a spark, make sure that the gap is not too large and try doing this where there is less light. No spark indicated a problem with the ignition. Look at the spark plug after several attempts to start the engine. Let me know if adding the fuel to the carb makes the saw try to start.
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I realize it is a riding lawn mower. I was working with a customer with a saw and accidental typed saw. The information is applicable. Perhaps I should have said crank the engine to check for a spark. If you tilted the mower on ti's side to drain the oil, many times this will allow oil to fill the combustion chamber and can foul out a new plug. Let me know if adding the fuel to the carburetor makes the saw try to start. Overfilling with oil can cause other problems besides fouling the plug but from what you have told me there are no indications of other damage being done.
Often oil can get into the carburetor. Adding the gas should clear this problem. Overfilling the engine can cause the oil to foam up which will decrease it's lubrication abilities. This can cause extreme wear to the engine parts. I am not saying this has happened but only that it is a possibility. It would be hard to determine the problem without further testing.