"Worth" is hard to estimate as values are different around the country. A little used, well maintained machine can bring up to $1000, or more. The key words are "well maintained". This means the tranny oil, engine oil, should have been changed regularly, blades/belts are in good shape, tires have tread, seat is not all ripped up, etc. Find out as much as you can, and see what the price is. If someone has a nice looking machine, but hasn't maintained the main components, it might not last very long. Many parts aren't available for these any more, so that drives the price down. Let us know what you find out.
Rattosh51
YT6800