About '06 I bought an '83 that had been sitting outside in the weather for 3 years. No clutch, no brakes, and the battery was deader than a doornail. Wasn't sure if it was going to be parted out, or put back on the street. Running was the main factor. Put a fresh battery in her, sprayed carb cleaner down the venturies, turned the key and it coughed and ran for about 3 seconds before turning her off.
Cool!! Poured fresh gas into the tank and a full can of Sea Foam. Started it again with the carb cleaner, and eventually she started to run on her own.... But like crap... Let it idle and the longer it ran the better it ran. Cleaned it up, bled the clutch and brakes, and took it on a 100 mile ride. I felt she even ran stronger than my first '83. Sold it a couple of months later. MOF I think I have a pic of both of them in my gallery... 'Double Trouble'.... BTW I never did flush out the tank...