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You are right about the cold air containing more oxygen. 2-stroke engines require tuning for weather changes but 4-strokes are far more forgiving. Unless you were tuning for peak performance at a specific temperature you're best just to leave it the way it was. Like Hooter said, that's the job of the choke.
Ken
I've have lived in a climate that varied between 95F in the summer and -30F in the winter, no carb changes were needed on a properly setup carburetor. What you do need though is an electric block heater........I'm sure anyone from Northern Manitoba or Northern Alberta can relate to this.
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