Well, I certainly would not buy it straight out without asking a question or two first.
I would ask about the compression. If compression is good, I would ask myself - do I want to have to work on a motor or would I rather spend a lil more money and not have to work on one?
Then go from there...after all the seller does have excellent feedback.  To Mulv's point, there's a chance he's a 2 stroke guy and doesn't know squat about fixing mid-eighties 4 strokes. Then again in one of his feedbacks it says:
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				as described could have mention that the motor did not have compresson
			
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 Make sure you ask about compression.
Blue's .02