What happens if you dont put 2 stroke oil in fuel on ktm 65?

2 cycle engines require lubrication - it is in part from the oil added to the fuel that this requirement is satisfied. What happens? Nothing good. Accelerated wear, then it will not run, either from seizing, something breaking into itty bitty pieces or otherwise becoming a paperweight. Feel free to assume you know better than the manufacturer, it'll be an object lesson for one of you.