1999 Ski-Doo Factory Shop Manual Volume Two, Page 99Get this manual
Section 04 ENGINE Subsection 02 (443 AND 503 ENGINE TYPES)
INSPECTION
Refer to ENGINE DIMENSIONS MEASUREMENT 04-04
Mount piston over connecting rod with the letters "AUS" (over an arrow on the piston dome) facing in the direction of exhaust port.AUS
ASSEMBLY
When reinstalling original needle bearings, make sure that 31 needles are inserted between sleeve and locating sleeveWhen installing new cageless bearing, replace half plastic cages by sleeve