What portion of the air-fuel mixture does the throttle primarily control?

The throttle primarily controls the air intake into the engine, which in turn affects the engine's power output and performance. When the throttle is opened, more air can enter the combustion chamber, and this change significantly influences the air-fuel mixture.

While the throttle does not directly control fuel delivery, it indirectly adjusts the fuel input due to the relationship between air intake and fuel injection. As the amount of air increases, the fuel system compensates by delivering the appropriate amount of fuel to maintain the correct mixing ratio for combustion. This relationship helps ensure that the engine runs efficiently and at optimal power levels.

Understanding this dynamic is crucial for anyone working with outdoor power equipment, as it is essential to manage the air-fuel mixture for smooth operation and performance. The other options, while related to the functioning of the engine, do not accurately describe the primary role of the throttle itself.