1982 Ski-Doo Shop Manual, Page 260Get this manual
SECTION 04 ELECTRICAL SUB-SECTION 02 (IGNITION TIMING)
5Install and adjust T.D.C gauge on engine as follows: Rotate magneto clockwise until piston is just before top dead center With gauge in adaptor, adjust roller so that it is parallel with dial faceTighten roller lock nut
position
advance position
Adaptor lock nut
NOTE: Ignition timing can change upon tightening Always recheck after tightening
Edge gap verification