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I've had my Suzuki SACS oil/air cooled engine run very rough due to the heat in city traffic in 90°F weather.
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in city traffic any engine would overheat without a cooling fan. even a liquid cooled one. liquid cooled engines rely heavily on fan assisted cooling, and it can work for air cooled engines as well.
also, rough running in very hot weather on carburetted machines can also be a mix issue, since they do not automatically adjust for changes in temp, elevation, humidity, etc...