Hello,
so if you get your pilot where its needs to be in 70 degree weather where the air screw ends up being around 1 turn-1.5 turns out, once its gets colder, you shouldnt have to adjust your pilot size, just screw your air screw in a half turn and you should be good. BUT lets say you were only at half a turn out in 70 degree weather, your prolly going to need to bump it up come crisp fall riding like now (im assuming your in MI) if your main jet is really rich in 70 degree weather you would be good now, but if you are more on the lean side of things in 70 degree weather, then going up 1-2 sizes come 40 degree weather is a good idea.