Well that is good news since I have a used 912 100 hp seating on the hangar.

My 80hp has the old style connections (it's 12 years old) and the 100 hp has the newer style. Other than that ... I might just replace the full ignition system from one to the other and see what it does.

The pick ups were gapped to the rotax manual value but since they are not adjustable, how can I make it to reduce that gap? Could I gently force it ?

Reduction gear was tested on the bench and yes, those spring washers were replaced.

Yes, I did the tracking on the prop tips and they all go thought the same point. But I don't understand what you meant with prop flange?

Thanks for all your inputs!
Jorge