How it's been treated during those 7000 miles is way more important than the actual mileage on the bike. I bought a maxi with like 10,000 miles on it and it still ran STRONG, good compression, no noticeable connecting rod bearing wear etc. Someone loved it and took good care of it.
Then again, if at some point during those 7000 miles, someone ran it w/o oil, the thing might be fuckard. I'd say do a compression test before you buy it, if it's >120psi, I'd say go for it:)