1999 Ski-Doo Factory Shop Manual Volume One, Page 112Get this manual
Section 04 ENGINE Subsection 03 (377, 443 AND 503 ENGINE TYPES)
Mount piston over connecting rod with the letters "AUS" (over an arrow on the piston dome) facing in the direction of exhaust port
377 Engine To center the piston pin with the connecting rod bearing, use centering tool (PN 529 009 100)AUS
529 009 100
A01C01A
1Exhaust
Install shouldered sleeveA01B1SA
NOTE: The circlip on the opposite side can be installed before pin installation, the tool will easily go outUse piston pin puller (PN 529 035 503) to install piston pin that cannot be installed as described above