2003 Ski-Doo ZX Series Factory Shop Manual, Page 114Get this manual
Section 04 ENGINE Subsection 02 (377, 503 AND 552 ENGINE TYPES)
Insert piston pin puller (PN 529 035 503) making sure it sits squarely against piston
A02C2CA
TYPICAL PISTON PIN EXTRACTION
A02C2AA
TYPICAL 1Properly seated all around
Install sleeve then shouldered sleeve over puller rod1 2
A02C2DA
TYPICAL 1Sleeve inside bearing 2Thrust washer 3Shouldered sleeve end