2004 Ski-Doo REV Series Factory Service Manual, Page 118Get this manual
Section 04 ENGINE Subsection 01 (593, 593 HO, 593 HO SDI AND 793 HO ENGINE TYPES)
A32C98A
A32C9AA
TYPICAL 1Allen socket screws 2RAVE valve base
Unscrew and remove the guillotine no9 from the valve piston no10 than remove the gasket no111
TYPICAL 1Spring 2Valve piston 3Bellows