1997 Ski-Doo Factory Shop Manual Volume One, Page 71Get this manual
Section 03 ENGINE Sub-Section 03 (377, 443 AND 503 ENGINE TYPES)
Screw in puller in order to remove it from piston Remove piston from connecting rod Install locating sleeveThen push needle bearings along with thrust washers using 21 mm (.826 in) diameter pusher1
A21C03A
1Expansion sleeve 231 needles 3Locating sleeve
A21C04A
1Pusher 21 mm (.826)
' and rings are available if necessaryINSPECTION