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The thing is all motors run hot and for running cooler we need that air flow for our air cooled bikes and the heat from the motor and exhaust dispels with that air flow, if your bike is running very hot it will let you know and stop and go traffic where that air flow is not very good  your motor will run hotter, in my first few years of owning my new 850 Commando our summers get very hot and riding in traffic stopping and going my idle would increase way above the normal setting when it was hot, it got so bad but I was also using the recommended oil the dealership was using and what the factory recommended GTX of old, might have been good in a cold climate but not good here in Aus, but in 1978 I fitted a Lochead oil cooler and ran 50 grade Pennzoil and never had a hot running motor since, I run my oil cooler all year round even in our mild winters, my motor still gets up to working temp as normal but cooling the hot oil down a bit before going back to the oil tank then back into a hot motor has made a big difference and one of the reasons I have gotten long life out of my motor, my Norton runs sweet all year round even in slow traffic and haven't had high idle from over hot motor.