1983 Ski-Doo Shop Manual, Page 199Get this manual
SECTION 04 ELECTRICAL SUB-SECTION 02 (IGNITION TIMING)
IGNITION TIMING
BREAKER POINTS IGNITION SYSTEMS
247 ENGINE TYPE
Two methods are detailed in this section; the first using the timing marks, stamped on the engine, the second using Top Dead Center gaugeRetighten retaining screws at this position
Timing marks procedure
1Disconnect spark plug wire and remove spark plug2Remove rewind starter assembly from engine then remove the starting pulley from magneto ring3Rotate crankshaft until breaker points, visible through magneto ring opening, are fully openedAdjust points gap to 0.35-0.40 mm (0.014-0.016") using feeler gauge and screwdriver as illustratedToo ea rly Turn arma ture pla te cloc kw ise Too la te Tur arma ture plate counter-cloc kw ise