I was not implying that one can just change oil, filter and add fuel and continue into the never never.
Of course one has to check such things as compression, metal in oil, gearbox backlash, and replace items subject to "ageing" such as hoses and O rings (esp in Bing's); even some Rotax's break!
There seems to be a lot of evidience however that TBO is not a figure that is not only achievable, but is frequently exceeded by numerous Rotax's..
What I was implying was Rotax engines, especially the 80hp, should see an old "gentleman" (did not like my other word) like me never having to place an add when I eventually sell which reads something like those very common in RAA mag..."airframe 1000hr, engine 400hr"...for non Rotax engined aircraft.
My current 914 which produces 115hp at 39inHg from (I think) about 1070cc...in other words a high output for capacity with some complexity...has more hours than a number of non Rotax engines I personally know that broke big time.
I rearly do not wish to start another Holden/Ford p.....g contest and will be very happy when "the other brand" have people posting about their engine reaching 4000hr plus "on condition"