air v's water cooled

[Simon.Pieman]

It's BHP init?  More BHP means more heat, I guess you could make the engines bigger with bigger fins but that's pointless, so it's water cooling init, only way to get rid of all that heat.  More BHP = more sales.

So engines that have lower horsepower can get away with air cooling then? (Except that most smaller bikes including commuters in a low state of tune are water-cooled)