After not riding for 3 weeks I got a break and went out yesterday in 5 degree (C) weather. While taking longer to warm up, once on the highway I couldn't help but notice a smoother running engine. My carbs are not that far out of sync to begin with (I'm assuming they are slightly out of sync due to some slight engine vibration), but yesterday the engine was bearly producing any vibrations. I did notice this same "smoothness" one other cold day, but didn't want to ask until I confirmed with another cold weather ride. So...can the cold weather affect carberation like this?