Charon
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Last summer I rode my '07 in a parade on a very hot (95 or more) summer day. The bike essentially idled the whole time, at least 45 minutes or more. As far as I could tell, the idle speed did not change, nor were there any other signs of overheating. The pipe did not discolor. There was no particularly noticeable breeze, either. Fuel was E-10; oil Shell Rotella "triple protection" 15W-40 conventional. Remember that while at those very low speeds there is little air cooling, but the engine is operating at idle power and isn't making an awful lot of heat. There will be some convective cooling by the simple fact that the hot air in contact with the engine will naturally rise and make way for cooler ambient air.
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