I have .90SP engine and, from my experience, there is no overheating problems with this engine. The only problem is the header and muffler. Those parts run hotter than any other engine.
I believe this is a particularity of the rotary valve – it releases the gases earlier than in conventional engines.
The air intake on the Tucano should be enough to keep the engine cool. The problem is that the air will hit the exhaust header before it reaches the fins …