haggis-catcher

Hi all. I am looking for a bit of advice, if anyone can help. I have the chance of buying a 1981 Yamaha XS250 Custom, that has been sat in a garage since 1982. It only has 415 miles on the clock, and is still owned buy the original owner. It does have corrosion on it, and the chrome is pretty goosed. He said he managed to get it running again, but not very good. Now i do know what risks are with this bike, and i know they were not brilliant. It just seems to me that it could be a good project. What i am looking for is some advise to what it really is worth, and what it would be worth when restored. I have posted a few pictures of the bike, and your comments would be great. Many thanks Stew