One last comment on the subject of 2 stroke vs 4 stroke;

I've had four engine failures in aircraft since I started flying 30+ years ago. Two of them were with 2 strokes, and the other two were with certified 4 stroke aircraft engines. And three of the failures happened on takeoff () All but one of the failures was fuel related, which I believe is the biggest reason for any engine failure in an aircraft.

So don't get too mezmerized by 4 stroke reliability.

Here's what I remind people of when I hear people berating 2 strokes for their poor reliability while talking up how reliable 4 strokes are;

"Fly everything like it has a 2 stroke engine in it. Any engine can fail..."

I love my 912 engines, and have never had one fail me. But I still try to fly it as if it is going to quit any minute...