Hmm, this is funny, but hopefully I'm wrong and won't harm my engine; when ever I run on a cold day, I find I have to run it a little LEANER to get the engine to warm up and drive around with power. On the next warm day, I actually end up running rich, in order to keep the engine from heating up above 250-260'F, keeping in mind the smoke density and all that in both scenarios.

I understand the physical/theoretical reasons for running lean in warm weather and rich in denser cold weather air, but my experience with my Pro.15 has been... unique.. in that sense.