How is the factory fan mounting on the new berg?
On my 570 I mounted the fan the same way as it was mounted on my 650. That is I through bolted it through the radiator. I also did this on a 530. Both bikes the mount worked well. No issues at all.
The factory aftermarket fan on my 390 was useless from the get go. The fan was mounted almost a full half inch back from the radiator. There wasn't any shroud of any time to direct the air flow. All the air feeding the fan came from the back side of the radiator.
Yesterday my son and I remounted the fan. We through bolted it using a similar technique as was used on my older bikes.
I can't believe that KTM doesn't provide a shroud with their factory fan setup.