Older KTMs weren't that reliable, but set against that they were mostly off road racing machines, so they sold on their ability to win races not how easy they were to live with! I had a 250 EXC and the electric starter would turn over without the engine firing... not the end of the world as you could still kick it. Otherwise the electrics never gave any trouble.
The road bikes particularly the bigger ones have benefited from focus and experience to improve reliability and I know of people who have clocked up high mileages with no significant trouble. There may be the odd rogue but I think the marque as a whole is pretty sound these days.
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