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The most common engine of this type is a four stroke cycle internal combustion engine that burns gasoline (in American English) or petrol ( British English). Burning is initiated by an ignition system that fires a high voltage spark through a sparkplug. The two stroke cycle type of engine is often used for smaller, lighter and cheaper applications but it is less fuel efficient.

One component in older engines is the carburetor, which mixes the gasoline with air. In later engines the carburetor is replaced with fuel injection.