Replaced my OE engine at 63k miles plus unknown race miles, primarily due to rattling top end - subsequent strip down revealed u/s cam chain tensioners only (plus damaged piston due to broken plug) - based on that and Colonel Klinck's 50k miles dropped valve, suggest top end overhaul incl. valves, guides, cam chains and guides, and possibly pistons, rings and small ends would be sensible at circa 50k miles.

Having said that, second engine dropped exhaust valve at circa 20k miles and then another one less than 50 miles after total engine rebuild............both resulted in bent con rods but no evident damage to big ends, crank, etc - bottom end proven to be strong, cf advrider.com.

guy that sold mine to me worked at KTM.
Said guys bring these bikes in with 100K miles on em. Said they're pretty tired by then but seems the bike can last a bit.

Mines got 42 k on the clock and runs as well as when i bought it with 7K miles.

good luck

Mine's running well at 58K miles. Knocking on wood.

This is the question I always ask other 990 Superduke riders I meet...and hope not to hear horror stories

Aye, probably still me as he told me that he spoke to a SDR owner there round about then - call whom?

Sorry, wires crossed...you mentioned talking to Paul about an engine rebuild.

And your friend was talking about you not Klinck...didn't read it properly the first time :'D The story seemed so familiar at the time but it was only after I remembered I had read it on this forum but couldn't remember who it happen to.

With hindsight I would have changed the valves out when I did the cam chains at 52k. Seemed expensive at the time but not as expensive as a ruined engine. Live and learn.