2004 Ski-Doo REV Series Factory Service Manual, Page 126Get this manual

2004 Ski-Doo REV Series Factory Service Manual, Page 126

Section 04 ENGINE Subsection 01 (593, 593 HO, 593 HO SDI AND 793 HO ENGINE TYPES)
In case of play, turn blade upside down and recheckIf there is still play, replace blade andor valve bodyCheck distance from blade stopper outer edge and distance from center of reed valve block