Ignore these A4 naysayers. Hie thee over to the Moyer Marine forums
, where we talk A4s all day and night long. The A4 is a great little engine that's nearly impossible to kill, and is lots quieter and less stinky than a diesel.
By all means, if you can get hold of an outboard in the interim, put it on your transom and get sailing. But don't abandon the A4 without coming over to talk with us A4 enthusiasts first.