1999 Ski-Doo Factory Shop Manual Volume One, Page 111Get this manual
Subsection 03
Section 04 ENGINE (377, 443 AND 503 ENGINE TYPES)
Remove piston from connecting rodInstall locating sleeveThen push needle bearings along with thrust washers and sleeve
A02C2FA
A02C2GA
TYPICAL 1Locating sleeve 2Sleeve
NOTE: 0.25 and 0.5 mm oversized piston and rings are available if necessaryUse locking tie to fasten all needles and thrust washers along with locating sleeve
TYPICAL 1Sleeve