I have well over a thousand hours behind two-stroke Rotax aircraft engines, and although they are reliable and cheap, they are simply no longer acceptable as an aeroplane powerplant when compared to the Rotax 912-family of engines.
My advice to anyone still flying a two-stroke powered aeroplane is fly it until the engine is worn out and then scrap the entire machine and embrace the world of four-stroke powered aeroplanes. You'll wonder why you persisted with the two-stroke for so long.