Not the worst bike but my worst Outfit in the early 90s
2019 KTM 790 Adv R. Bike decided to eat its own piston at 14800 miles. I changed the oil every 4500 miles on the bike. Put the new Rottweiler Performance air box and cleaner on it to prevent the dirt getting by the OEM design.
It spent over a year in the shop at KTM Santa Fe before they brought it back still not right. Another 3 months later they finished it but it would rough start and idle weird. I traded it in on my DDX in December and literally the next day a mechanic there took it for a ride and it started puking coolant everywhere! 1 ride away from it blowing up again and going back to the dealer.
Also KTM and an Aftermarket Warranty refused to cover the bike. All repairs for a while engine rebuild was on me. Will never go team orange again.
There's a reason KTM sold the rites of the 790 engine to CFMoto in china. They fixed it's issues and now KTM is having them build the engine for them to put in their new economy model 790. If I was you I would get off all things KTM. I had an 1190 do the same thing at 8k miles. At least it was covered under warranty.Makes me super nervous about my 890. You're the second person I "know" that has had a 790 grenade on them. The other guy also had a piston go. He tried to buy a "crate" motor from KTM. They refused to sell him one and made him buy all the parts separately which we know is ridiculously expensive to do. I think by the time he had all the parts and had it reassembled it was between 4-5k. He too promptly got rid of it. I've not heard any severe issues like that with the 890 so I'm "hoping" mine doesn't do the same.