[mvorbrodt]

Hi gang!
So we had some cold days here in S. FL. for a change, at last! I've been riding my '06 Spirit 750 to work almost daily and I noticed like the bike is more alive, more responsive, and more powerful than it was in the punishing heat of the summer

Has this been your observation as well?

 

[verdeva]

All engines run better in the cold because the air is denser. A huge difference may indicate your mixture is too rich.

 

[mvorbrodt]

All engines run better in the cold because the air is denser. A huge difference may indicate your mixture is too rich.

i wouldn't say huge difference, but noticeable for sure. like going from nice and quick to zippy

 

[2500hdon37s]

yup, cold dense air is an engine's favorite!

My bike has a bit more pep as well!

 

[Beezer]

I was a crewchief in the Air Force. Spent every minute of every day on the flightline. It was very noticeable that on their takeoff roll they would leave the ground at a much shorter point on the runway on a cold day compared to a hot day. Takeoff roll seemed to be about one third less. It was a good demonstration on the properties of air and it's relationship to temperature. It's a well known character of the temperature/density factor in wing lift but the engines run better too.
My guess for the better engine performance is that it translates to more oxygen content by volume to affect combustion but that's just a guess.