RE: Engine stalls
OK - when the air gets colder around o degree C, to keep the engine temperature in the correct range you may need to lean the engine out to keep it warm. Temp between 40-80 degree F doesnt really make much difference.
If it begins to lean bog then you went to far, but the majority of our factory team makes the engine as lean as it can (to get horsepower) and keep the engine running in the correct operating temperature, (225-265 F.) Adjusting this setting is critical during all times of the day and nightime is no exception.
Another factor is the humidity . It affects the engine condition greater than temp. You want to richen up if its dry.
Hope that clears up what was said earlier.