1979 Ski-Doo Supplementary Shop Manual, Page 114Get this manual
SECTION 04
SUB-SECTION 04 (IGNITION TIMING)
4Chec timing using stro bosco pi timin light (o eac cylinder)+
WARNING: Place ski tips against the wall, raise rear of vehicle so the track is not in contact with the ground and place it on stand equipped with protectorMake sure nobody passes behind the vehicle during timing procedure
If co rrect timing is impossibl wi th rigger co il brac ket travel, stop en gin e, remove bracket from cran kcase and reloca te the trigger co il on its bracket