My car has a high compression engine, more bhp and sheds its heat ok. It rarely moves off the engine stat temperature and when the fans come on, is still controlled at the engine stat. temperature very quickly. In fact you can see how quickly by watching the gauge dropping.
K bikes have no decent sealed shrouds around the fan housing, just right angle ducting which is very airflow lossy. The radiators need more surface area, but this is not practical unless you do what the Japs do and design the rads as a wrap around.
In Winter, the temperature you see on the gauge is the engine stat. temperature. When the gauge reads higher than this, the cooling system has lost control as there is either insufficient airflow from the fans at low mph, or insufficient radiator area to bring down the temperature at 50 mph plus.
Motorcycle designers started with airflow cooling and met all the problems of city riding as engine sizes got bigger. But they know that engines (especially oil) can take a certain amount of peak heat overload and unless you are the city despatch rider sort, you will soon be moving with enough airflow to bring the temperature down.So the K bikes can take some extreme temperature cycles - but that doesn't mean it's a good thing.
K bikes are Sport Tourers, which kinda lets them off the hook if you are a heavy city commute rider with average speeds in hot Summer less than 50 mph, or ride in city tunnels a lot.
The issue of compression ratio is not the main factor, it's also the amount of ignition advance used to get performance. If you retard the static ignition timing, even by a couple of degrees, there is less heat produced at the low rpm end.
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