My weather only drops from 115 to the mid 20s, OK that is a lot but it doesn't get down as low as some of my friends fly in. I have to fatten up my high speed needle every year when it gets down to the 40s and 50s. Because it happens every year I know it is only going to be four clicks on the high end. My friends on the east coast and mid west told me to try lighter fluid, about 4 drops on those cold mornings, right down the throat of the carb. It works but I can't get to most of the carbs on my planes. With a lot of rolling over I can get them going but my cold weather friends tell me they do everything Ken mentioned. I came up with my own favorite way though, I don't bother going flying unless it is going to be 50 or above. Here in NV that isn't too hard most the time. I may miss a couple of weeks a year but I wait for our warm spells. Last week it was 70+, this week it was in the 20s out at the field again, I'm finishing up a build in my heated shop.