Air-cooled engine loose heat through the cooling fins.
Yes, they do loose heat better with air passing over them, but I have sat in traffic for what feels like an eternity on several air-cooled bikes and have never had an engine failure, although I could feel the ambient temperature around the engine rising.
You'd have to leave it running for a good while to have problems, IMO.
On a water cooled bike the heat emitted from the einge is abosrb by the coolant. Once the temp reaches a set amount the thermostat will activate the fan to keep the bike from over heating...
On any bike, if it looked like I was going to sit there for a while, I just flicked the kill switch: no point in burning juice to go nowhere...
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Adventure: it's an experience, not a style!
(so ride what you like, but ride it somewhere new!)
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