Notice even the wet heads have still have the plastic heat defectors under the rear of the fuel tank behind the cylinder. They are still hot in that area. The other source is the CAT in the joined headers before the rear pipes split to either side. No cover on the inside of the CAT towards the frame. Heat just pours off of it helped by air flow from the front.

That and a pressed 3-piece crank that goes out of round easily, a compensator sprocket that wears quickly from lack of primary lube, and no power without after purchase $$$$. I tried to like them and make them run with the big dogs, but finally gave up.

They'll simply need to redesign the engine and frame to compete with Indian and others.