1985 Ski-Doo snowmobile Service Manual, Page 78Get this manual
Section 02 ENGINE Sub-section 04 (447 ENGINE TYPE)
ASSEMBLY
21,23, Pistonscirclips
At assembly, place the piston over the connecting rod with the letters "AUS" (over an arrow on the piston dome) facing in direction of the exhaust port
EXHAUST
A001002001
To minimize the effect of acceleration forces on circlip, install each circlip so the circlip break is at o'clock as illustratedRemove any burrs on piston caused through circlip installation with very fine emery cloth
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4009002010
420 876171 tool
1,2, Nutsdistance nuts
Position nuts and distance nuts as illustrated