I am not a Jabiru expert but from what I can gather Jabiru engines need more attention than some others, and it needs to be carried out by people with specific Jabiru knowledge and even then I think I would feel safer with a properly maintained Rotax two stroke. For that reason I would not buy one and avoid flying one which is a choice we all have.
No and I doubt if Jabiru would recommend that either as it would require the heads to be removed.
This not an unusual practice during an engine rebuild.
Probably to check the tappets on solid lifter motors.
I don't think so, that's how the term Jab basher came about. What do you suggest be done about it David? Ground them all? Not a problem for me but... Who has caused these problems? Easy to blame Rod Stiff or the factory or RAAus but then the Jabiru prangs should be no secret and people still buy them, so who is really causing the problem?