A control system for an engine including a fuel delivery system and an ignition source is provided. The control system includes a detector, a processor, and at least one actuator. The detector is configured to sense a signal to change from a compression ignited fuel to a spark ignited fuel. The processor is configured to receive the signal from the detector and generate an actuation signal. The actuator is configured to receive the actuation signal, vary an operating speed of the engine, and selectively control at least one of the fuel delivery system and the ignition source.