i am not joking,
Apparently the sx-f is proving the most reliable and most promising. Possibly with a Husaberg 450 cylinder and valves. PS gearbox change is relatively simple. (words were whispered by a certain KTM testrider, who also just won a rally and speaks spanish). An no the 690 frame etc will not be used as it is too heavy for a 450 engine. A new trellis frame is easily built.
Be assured that it will look like a 690 rally bike, just smaller and lighter. (A bit like the Sherco masterpiece). Got the hots for carbon.
Credit to Casteau, every single brand of bike broke in the challenge except Sherco, unless i missed an engine change but that could be precautionary, and not because of a breakdown in the desert.
Even 690's broke down.