2005 Ski-Doo Tundra, Skandic, Expedition Shop Manual, Page 115Get this manual
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Section 03 ENGINES (2-STROKE) Subsection 03 (593 AND 593 HO SDI ENGINES)
Remove the valve piston
A32C9BA
A32C99A
1 Guillotine 2 Gasket 3 Valve piston