Maybe just my experience but i,d expect to put some $$$ into the Zilla or basically any used quad unless you know the guy and he was a fanatic.Even when "rebuilt" you,d be surprised how much stuff is "half assed" by some.I,d also ask if the rear shock was rebuilt and see if you can see any pitting on the shaft.Most people don,t service the shocks and once you get inside it can be nasty...My LT250 rear shock was supposedly "rebuilt",upon disassembly it was a mess.Piston shot,shaft needed to be fixed,etc.Sometimes you get lucky but most times I generally expect to spend some $$$ to get it in tip top shape and even more if you want to put your own touch on it,bigger carb,different pipe,etc,etc.Basically don,t take anything for granted.