I would say a pint of base ought to do it, as I had a quart and did my GS, which consists of tank, fender, side panels, the part around the tail light, and the part around the headlight, and had a ton left over. Enough to do a yamaha scooter and a lot of little parts on my race car.
A quart of clear, since you can't buy less, I don't think.
Here is a pic of the bike, so you can see what all I had to paint:
(I hope this is ok, I linked it from imagestation, if not, feel free to delete it)