Just bought the same Polaris. It is factory with 6 wheels. Not shaft driven, chain from the engine to middle wheels, different chain from the middle to last set of wheels. Great advice from the other people.
Carb clean, adjust chain tension, check all bushings, brake pads. Lots of people remove the oil pump and mix their own. This is because the pump goes out and the motor burns up. A lot cheaper to mix your own.
Hope the project works out. if you see this and need any other help, PM me.