There is usually some real good reason or "issue" that a 200 hr Rotax, just out of warranty, would be for sale. They say Rotax's usually make TBO and then some with regular maintenance.
The only good reason I can think of, why one would be for sale, would be to upgrade to a larger engine .
I would only look at one that has a good log, and if repaired, done by a known quality Rotax center.
I doubt anyone is going to sell their 200 hr engine if it is running well and fitting their needs.