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Air-cooling is nice because of its simple layout, but makes it harder to ensure a proper thermal control of the engine. BTW when dedicated-ethanol engines started to appear in Brazil, Volkswagen developed some thermostatically-controlled airflow restrictors to provide a quicker warm-up for its air-cooled dedicated-ethanol engines, so if you could work around a similar system for the bike it wouldn't decrease the winter mileage so much (if you would ever consider to ride it in the winter).
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