As a general rule, the reasons a generator will stall when the choke is turned off are due to stale fuel, a clogged or restricted main jet, a clogged or restricted pilot jet, a loose fitting carburetor, or damaged carburetor gaskets. When the choke is turned off, the carburetor allows more airflow into the combustion chamber. If the airtofuel ratio is not correct when this takes place, then stalling will occur. This can be a fuel problem or an airflow problem.

https://homebatterybank.com/quicklyf...