1979 Ski-Doo Supplementary Shop Manual, Page 92Get this manual
SECTION 04 SUB-SECTION 02 (ENG INES)
CLEANING
Discard all gasketsClean all metal components in non -ferrous meta cleaner
: Place clean cloth over crankcase to prevent ci rcl ips from fall ing into crankcase then use pointed tool to remove circl ips from pistonDri ve the gudgeon pins in or out using suitable drive punch and hammer Scrape off carbon formation from cylinder exhaust port, cy linder head and piston dome using wooden spatula
DISASSEMBLYASSEMBLY
G)Because
of cap nuts, cy linder studs have to be screwed into crankcase so they do not protrude further than 15.6 cm (6.140")If it is not possible to obta in th is length, washer must be added between cylinder head and cap nut_ "
NOT E: The letters "AUS" (over an arrow on me piston dome) must be visible after cleaning
Clean the piston ring with groove cleaner tool, or with piece of broken ring CAUTION: When tapping gudgeon pin in or out of piston, hold piston irmly in place eliminate he possibilit ies of transmetting shock and pressure to the connect ing rod