$2000 is a great price for the 89 if you think it will only require a little work to make it reliable. If the alternator just needs new rubbers that only takes an hour or so tops to make that happen.
Every single system will have to be gone through just to make sure the bike is road worthy. And this is a bike that was left to the regular repair shop for everything, so there's a pretty good chance the drive splines and other systems haven't been serviced correctly.
I can probably put off the carb work and hope a steady diet of Sea Foam will improve the backfiring, but eventually, sooner than later, that system will need attention, too.
Then there is the small stuff. Seat and backrest need recovered and the guy decided to pull the wires out of the air pump, so he shorts them to air up the rear shock. I'm sure there would be lots more found if I buy the thing. And, it has one of those gawd-awful super-tall windshields that will need to be replaced first thing.
Once all that is taken care of, and the bike is ready to go for a long ride, it still shows considerable age and abuse on the surface.
It has a back rest, cruiser pegs, chrome windshield garnish, trunk rack and passenger armrests, plus the aforementioned shield that I can sell to recoup some the the service costs.
I'm still undecided.