Hi Oxeagle.
For what it's worth, I echo the above advice. Now for a bit more.
As the aircraft has previously had a Permit, contact PFA and ask if they have anything on file for this particular aircraft that you should know about. After all, it has been on the ground for two years. Why?
If you don't already have a friendly PFA inspector, call the PFA or review the PFA website for the contact details for a local inspector. These guys are helpful, knowledgeable and your best starting point, even before going to see the aircraft.
If 'your' inspector considers that the engine has been correctly preserved, the engine may not need anything over and above normal servicing and assessment for any recent (within the last two years) non-compliances regarding AD's, SB's etc.
If, however, he considers that the engine has received no attention over the last two years, the engine may require a complete stripdown. Advice from the appropriate specialist (Jabiru, VW, etc) will need to be sought. 'Your' inspector will be able to advise you of this.
If 'your' inspector suggests that the aircraft is OK, have a chat with him about his estimate for renewing the permit. This will give you a figure for bargaining. It may then be worth considering purchase if the aircraft comes with a new Permit. Your choice. But at least you will have had an independent pair of eyes (non-rose tinted type) look at the aircraft first.
It would be very prudent to initially check the Weight and Balance schedule and see if you will be able to operate the aircraft with any useable fuel on board.
Hope this is of some help.
camlobe
(PFA Inspector and AMEL)