Actually the AW Yak cooling isn't much problem.

Notice the fake engine blocks air that disrupts good cooling and lets in air that has to encounter the engine. I'd have a picture of the underside, but it's all white down there with just two moderate holes to make getting the cowl over the pitts muffler pipes easier. That huge opening AW designed in for a stock muffler works great to provide adequate exhaust for the heated air.