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The best way to do this is to check that the unit is full of oil. Then measure what comes out when you drain it. Put this amount back in and you should read about a pint less than you need. That is because that is what is in the filter that you changed when you drained the oil. You are going to change the filter, right?
Fine tune the top up and you are good to go.
Go to your local auto parts store and buy an inline spark tester if you don't have one.
Next time the engine stalls, use the inline tester (goes between spark plug and plug wire) to see if there is spark. If there is no spark, then most likely the engine has overheated the ignition module. Check the oil level, low oil level will cause overheating. Check the cooling fins, clogged fins will cause overheating. The ignition module will need to be replaced for a long term repair. Make sure to correct any overheating condition also. When/if you replace the module, it is a good idea to inspect the flywheel key. It is located under a very large nut on top of the engine. If the flywheel has rotated on the upper crankshaft, the flywheel key (aluminum) will have been damaged. This also can cause an overheating situation. Good luck!
There is a compression release device on the cam shaft to allow the engine to spin easier when starting. This is likely the culprit because the starter isn't strong enough to push the engine past full compression. The fix is to replace the cam shaft.
There is a kill switch under the seat that makes sure you stay in the seat if the mower is running...my bet is that the switch is malfunctioning and the vibration of the motor is causing it to short out...get a new switch, they can't be that much...