1980 Ski-Doo Shop Manual, Page 52Get this manual
SECTION 03 SUB-SECTION 02 (ENGINES)
BOTTOM END
CLEANING
Discard all seals and gasketsClean all metal components in non-ferrous metal
pusher no
cleaner
DISASSEMBLYASSEMBLY
General
Refer to Technical Data (02) and Engine tolerances measurement (03-01) sections for some component fitted toleranceIf necessary, refer to Drive Pulley section (05-03) to remove drive pulley
not remove unless necessary'
To remove, heat slightly with butane torch then pry
out using screwdriver