Nutshell number two

If the used 55AX deals falls through go out and buy a new one that would be the best gift you could give yourself. Get your brain unwrapped around the attitude that its an engine, I gotta buy an old and cheap one.

The 55AX could not have been a better choice for that airplane and the mission you have in mind for it: Learning how to fly and learning how to operate our engines (they are not the same as the car engines not by a long shot).

Bear in mind not every one considers a fourstroke an upgrade, its all about the mission.

John