My brother broke it in good the day after I bought it by riding it out to where I live by putting 176 miles on it that days. This didn't start until a couple of weeks after that. That's why it is so mystifying to me.
I just bought my 2015 KTM RC390 last month and it has suddenly developed a strange issue. It will run perfectly fine until I reach the 52-55 mph range then all of the acceleration and engine power drops out until it falls back into the 40 mph range and you can then re-accelerate back up to the...