It's hard to say without seeing it. I assume that it has a good/clear title. Doesn't matter if you are going to part it out but to get running to ride or sell, you will need it.
You say that it's clean but apparently, you haven't seen it. I know from experience that pictures can be deceiving. All that being said and having not seen it, I personally would not pay more than 500 - 1000 dollars for it. That is if the plastic and etc. is in really good shape and there is not a lot of rust all over everything. I would probably be around the $500.00 mark.
For example, there is an '89 for sale here locally. 80,000 miles but the ad says that it runs and rides. Some bumps and bruises it says. The asking price is 1250.00 though. Now the one you are looking at may be in much better condition even if it's not running.