1980 Yamaha 850
I just finished getting mine in running condition today. The guy I bought it from seemed to think that bikes maintained themselves. After changing all the fluids and tightening the cam chain ( I didn't know a loose one would make the engine sound like it was about to blow up.), it runs like a champ. Very smooth and quit, and the price was right. Super low miles and came with another bike of the same model that had been wrecked with only a few miles on it. So I have the full bike, and every part for it except the frame and front fork.
And still my favorite, 1982 Honda CX Custom