I am searching for a nice motorglider, but a big issue with Rotax engines allways comes, that is there are many motorgliders 10 to 15 years old and with almost no time engines 100 to 500 hours. BUT you need a 10 year overhaul to be airworthy and the price goes from U$ 20,000 and up? Maybe 25% or more of the airplane value.
Why? I think a good inspection would be more than enough in engines less than 300 hours of use. And save maybe 80% of the overhaul cost.