Red Seal Motorcycle Technician Practice Exam

What is the primary function of the throttle on a motorcycle?

1. To increase fuel efficiency

2. To regulate engine speed

3. To control the braking system

4. To adjust the headlight intensity

The correct answer is: To regulate engine speed

The primary function of the throttle on a motorcycle is to regulate engine speed. When the throttle is opened, more air and fuel enter the engine, resulting in increased engine power and higher RPM (revolutions per minute). Conversely, closing the throttle limits the air and fuel, reducing engine power and RPM. This control allows the rider to modulate how much power the engine produces, which directly impacts the motorcycle's acceleration and speed. Understanding this function is crucial for safe and effective riding, as it allows the rider to respond appropriately to various riding conditions, such as when accelerating from a stop, overtaking another vehicle, or navigating corners. The other options do not accurately describe the throttle's role; for instance, while increasing fuel efficiency can be a secondary benefit of smooth throttle control, it is not its primary function. The throttle does not influence the braking system or headlight intensity, which are managed separately.