If you are in Cal that chipper is not CARB legal. If you're operating in public then the chances of you getting busted are good, $3000 fine for first offense.
I bet the guy selling it didn't tell you that.
Apart from that, most the Woodchucks coming from Davies are hammered. I buy them from time to time but pass on far more since they tend to be in such bad shape. 1250 hours in not likely, probably closer to 3000 or 4000. The WC17 is a good chipper though. Closer to a Bandit 200 then anything else, heavier built, low center of gravity and nice feed roller motors. That Perkins isn't a very good engine though, I have seen far to many blown ones.
However, anytime you can get a good running 12" disc chipper for under $8000, its a good deal. But in Cal, those days are over. If you buy it, it's likely you'll use it for a year, then get busted, handed a $3000 ticket, order to take in home and sell it out of State and provide proof of the sale. You'll try for 6 months or so but the only calls you'll get will be in Cal and you need to show it was sold out of State so no sale. So you send it to auction where you get maybe $3500.
If you don't know what the hell I'm talking about the google "California Air Resource Board", look under Portable Equipment or "PERP".
All engines are regulated at this point.