1999 Ski-Doo Factory Shop Manual Volume Two, Page 97Get this manual
Section 04 ENGINE Subsection 02 (443 AND 503 ENGINE TYPES)
NOTE: The following procedures can be done without removing the engine from chassis
CLEANING
Discard all gasketsUse Gasket Remover (PN 413 708 500) to clean mating surfacesClean all metal components in non-ferrous metal cleanerScrape off carbon formation from cylinder exhaust port, cylinder head and piston dome using wooden spatulaNOTE: The letters AUS and arrow on the piston dome must be visible after cleaningClean the piston ring grooves with groove cleaner tool, or with piece of broken ring
Use piston pin puller (PN 529 035 503) along with 18 mm sleeve kit (PN 529 035 541) and locating sleeve (PN 529 023 800)NOTE: The locating sleeve is the same that contains new cageless bearingInsert piston pin puller (PN 529 035 503) making sure it sits squarely against piston