After two years of tuning during the Spring and Summer with O2 sensors, I found that once the cold Fall air hit I started having lean cold-startup problems. Since I had leaned out the carb to idle/transition/cruise in the 14.0 range, I found that I had to richen up the electric choke to compensate for the colder air with the leaner A/F setup. I am now an electric choke fan.

I do remember that I used to run a non choke DP Street Demon on the same engine. That carb would fire right up and idle on it's own in the Fall temps with two pumps of the pedal. I now wonder how rich that carb was running at idle/transition/cruise to be able to do this.