What differentiates a manual choke from an automatic choke?

A manual choke is operated directly by the user, allowing them to manually restrict airflow to the engine for starting in cold conditions. This hands-on control ensures that the user can adjust the choke according to specific starting needs. In contrast, an automatic choke uses a mechanical or electronic system that automatically adjusts the air-fuel mixture based on engine temperature, often utilizing a vacuum system or thermally controlled elements to manage the choke's position without direct input from the operator.

Understanding the workings of a manual flow system provides insights into its advantages, such as customization for specific engine conditions, while an automatic system offers convenience, taking the guesswork out of starting the engine under various conditions. The key differentiation lies in the operator’s role in controlling the choke; manual require active engagement, while automatic functions independently after being set up for conditions.