With KTM this is a valid concern, IMO. My solution was to buy an extended service contract/warranty from the dealer.

In USA I think KTM offer 2 year factory warranty on new bikes. On my first KTM Duke 11, back in 2002, (bought used). Also bought an extended warranty for about $500.

The warranty added 3 years more warranty on top of factory warranty. I never needed any of it. But that Duke did not get much use because I have other bikes then (Vstrom, dirt bike and DR650) I never pushed that Duke hard because I was afraid it would blow up. It did not. No major problems with it ...

Only thing that went wrong was the countershaft nut sprocket came off.
I bought new nut and secured it with tabs better. No more problems.
Good bike from my experience. It was still "like new" when I sold it.

When I sold my KTM it still had a year of warranty left which transferred to new owner. But if you buy a used bike from a private person (not a dealer) then I don't think you can buy extended warranty.

My current Ducati is in the shop now getting repairs. Very expensive repairs. I just bought this bike used from a dealer a few months back. It seized a cam belt bearing, destroyed front cylinder. $$$$$$

Luckily I bought an extended warranty. It cost $800. But the bike was cheap due to high miles. The repair has taken forever and warranty company did not want to pay, but finally have paid. Total repair cost ? OVER $6,000!
All covered under warranty ...

Suffice to say, that Ducati will go up for sale the day I get it back from the shop. Much as I LOVE THAT BIKE ... I can't trust it, ever. So, this is why I'm looking at the new KTM 690 Duke.