Assertion: motor's set | /r/AtLocation | actual spark
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Source sentences:
text: the spark plug or igniter sets fire to the compressed fuel and air (a to force the piston 'down' towards the crankshaft) - When the piston is furthest from the crankshaft, it is said to be at - the actual spark usually occurs when the flywheel inertia has moved the crankshaft a few degrees further, so the piston has actually already started its 'decent' before it gets a push from the expanding hot burning gasses!