Re: WHAT IS THE SMALLEST COMBINE HARVESTER???
There's a LOT of old, small combines around. The question is, do you really want to run something that in-efficient?
If I were you, I'd look out for an MF 550, 750, 760, 850, or 860 (smallest to largest). On the JD side, the 6620 is a small combine, but is a darn good machine. The same goes for 7720 and 8820, though they are a bit bigger.
On the CIH side, the 1400 series (1460, 1466, and I believe 1488) is the oldest you want to go, as the older ones are gas-engined mostly, and conventional (1400 series was the first axial flow).
PS: where are you from, zak123?