the spark plug ignites the gas/air mix, forcing the piston down. that pushes down on the connecting rod, turning the crankshaft; the crankshaft turns the flywheel, which keeps the engine going

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1. the spark plug ignites the gas/air mix, forcing the piston down. that pushes down on the connecting rod, turning the crankshaft; the crankshaft turns the flywheel, which keeps the engine going