1972 Ski-Doo Shop Manual, Page 151Get this manual
TWO CYLINDER
locationOnce the circlips are locked into the appropriate grooves, tum each circlip so that the circlip break is not directly on circlip notch break (fig2-3-28)
13Place the appropriate piston rings on the pistonUsing piston ring expander tool, open and position rings in proper grooves (fig2-3-30)