1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 66Get this manual
ENGINE SERVICING (WANKEL IM914B)
Mount the side plate power drive-side to the repair jig and secure with bolts 30Insert the mainshaft (3) with the pressed-on inner raceMount the retaining disc (1), shims (2) and circlip (4)Assure that the circlip is well seated in its grooveRotor Casing and Rotor Insert the two alignment dowels into the side plate power drive-side
CAUTION: Coat the rotor casing mating surfaces lightly with sealer, so that the latter isn't squeezed into the engine chambers when assembling, thereby hindering the sealing elements in their movement