What component is primarily responsible for starting a gasoline engine?

The starter motor is primarily responsible for starting a gasoline engine by providing the initial mechanical energy needed to crank the engine. When the ignition key is turned or the start button is pressed, the battery sends electrical current to the starter motor, which then engages with the engine's flywheel. This engagement causes the engine to turn over, allowing it to begin the combustion process.

Each of the other components plays an important role in the engine's operation but not specifically in starting it. The alternator primarily recharges the battery and powers the electrical system while the engine is running, the ignition coil generates the high voltage necessary to create a spark in the spark plugs, and the fuel injector is responsible for delivering fuel to the engine for combustion. While all these components are essential for engine functionality, the starter motor is uniquely tasked with initial engine activation.