1979 Ski-Doo Supplementary Shop Manual, Page 101Get this manual
SECTION 04 SUB-SECTION 02 (ENGINE)
CLEANING
Discard all gasketsClean all metal components in non -ferrous metal cleanerScrape off carbon formation from cylinder exhaust port, cy linder head and piston dome using wooden spatula Cross to rque cylinder head nuts to 20 N- (15 ft-Ibs); to rque each cy linder head ind ividually
(2) Posit ion nuts, distance nuts and distance sleeves as illustrated
NOTE: The letters" AU S" (over an arrow on the piston dome) ,must be visib le after cleaning
Clean the piston ring grooves ith groove cleaner too l, or with piece of broken ring