The chonda on that Greenkeeper is probably a copy of the GXV160, which was advertised as 5.5 hp. There have been small ride-ons with less power than that, so it should be able to run that machine around with no load and the deck removed. It will still have the original gearing though, so you may be limited to the lowest couple of gears, and I doubt you'd be able to tow anything much.
