All my bikes have run better when cool. I think all engines run better when cooler, thus liguid cooling making more power than air cooling. I thought higher humidity = more dense? Or am I thinking barometric pressure?
The humidity affects atomization of fuel more humid means more moistier less fuel. Dry air is good and the usually is accompanied by lower temps. I know from racing for decades my bikes prefer 50-60 and optimum was 54. To cold and the fuel stays a spray not a mist. To hot and that same mist almost evaporates and becomes harder for the motor to get that same volume for optimum power.
Air pressure and density also affect sound waves.
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