ENGINE STOPS
The manner in which an engine stops will indicate the reason for it.
A failure of the ignition system that stops the formation of current, like the sticking of the circuit breaker lever, will cut off all explosions instantly; the engine will stop abruptly. An engine will not stop abruptly from any fault with the mixture; with mixture trouble the explosions will become weaker and weaker until they cease.
If an engine stops through a failure of the lubrication or cooling systems it will be intensely hot, which will not be the case if the fault is with carburetion or ignition.
A running engine will not be brought to a stop by a loss of compression.