I own a 1993 Polaris XCR 440 (0931760). It was originally a liquid cooled sled from the factory. Prior to my owning it, someone took out the original motor and put an air cooled motor in its place. Is there any way I could find out what size and possibly what year this air cooled engine is? Number stamped on the motor, etc.? And if so, where would it be located? I would appreciate any help on this.