Our problem here is it can be 35 first thing in the morning then 80 by noon. This time of year I have to open my high end needles 4 clicks and that solves my winter time tune up problem. A little hard to start first thing in the morning and they are A bit on the fat side as the weather warms up. If you can get A couple of drops of lighter fluid into the carb it cures that morning start up problem.