Red Seal Motorcycle Technician Practice Exam

How does a motorcycle's fuel injection system function?

1. By using mechanical levers to mix air and fuel

2. By providing a continuous flow of fuel to the engine

3. By electronically controlling the air-fuel mixture

4. By relying on gravity to deliver fuel

The correct answer is: By electronically controlling the air-fuel mixture

The function of a motorcycle's fuel injection system primarily involves electronically controlling the air-fuel mixture delivered to the engine. This system uses sensors to monitor various engine parameters, such as temperature, throttle position, and air density, to adjust the amount of fuel injected for optimal combustion efficiency. The electronic control unit (ECU) processes this data and adjusts the fuel delivery in real time, ensuring that the engine runs smoothly under various conditions. This precise control enhances performance, improves fuel efficiency, and reduces emissions compared to older carbureted systems. In contrast to this method, other options such as the use of mechanical levers or relying on gravity are outdated or inaccurate descriptions of how modern motorcycle fuel systems operate. Continuous flow systems might suggest a less controlled environment that doesn't account for real-time adjustments needed for efficient engine performance.