Because the governor is constantly adjusting the throttle plate position in response to changing engine load, you would expect the __________ will wear out considerably faster than the choke shaft.

The throttle shaft is subjected to continuous movement and mechanical stress as the governor continuously adjusts the throttle plate position in response to changes in engine load. This constant action means the throttle shaft is in frequent motion, leading to increased friction and potential wear over time compared to parts that do not have such continuous interaction, like the choke shaft.

In simpler terms, the governor's role in managing the engine's power output involves not just minor adjustments but also frequent and repetitive positions that the throttle shaft must accommodate. This is different from the choke shaft, which primarily operates during specific engine start-up conditions and is less frequently adjusted once the engine is running smoothly. Therefore, the throttle shaft is more exposed to wear from mechanical fatigue, making it likely to wear out considerably faster than components that are less actively engaged, such as the choke shaft.