One of our 690's busted their radiator at Dalhousie in the exact same position. We think it must have been from the corrugated roads from the great central road and the Finke race course? Nursed it across the Simpson and KTM replaced it under warranty. didnt see anything to suggest an impact damage. Didnt ever stop the engine running though and it got hot a few times crossing the dunes. His boot was completely wet everyday with radiator coolant. He had the higher pressure rated radiator cap fitted, but not the Rally Raid 84 celcius temp sender.