1979 Ski-Doo Supplementary Shop Manual, Page 111Get this manual
SECTION 04 SUB-SECTION 04 (IGNITION TIMING)
6Slacken the two (2) armature plate retain in screws and turn timing instrument ONRotate magneto counter-clockwise until specified piston position before top dead center is reached
8Hold centrifugal lever in full advance POSition (toward magneto rim) and rotate crankshaft until PT.O piston approaches T.O.CAs soon as same specified piston position before top dead center as on magside is reached the timing light should fluc tuate or tone signa level vary If necessary to adjust proceed as followsWith centrifugal lever in full advance position and piston at specified position, slacken lower breaker point set retaining screw then readjust breaker point gap until timing light fluctuates or tone signal level varies If timing is too early decrease breaker point gap toward lower limit, i.e0.35 mm (,014"), then recheck timing If timing is too late increase breaker point gap toward upper limit, i.e045 mm (,018"), the recheck timing
Engine type
Direct measurement B.T.D.C