1980 Ski-Doo Shop Manual, Page 153Get this manual
SECTION 03 SUB-SECTION 03, (IGNITION TIMING)
TOC GAUGE PROCEDURE
1D,sconnect spark plug wires and remove spark plugs
2Remove rewind starter assembly from engine then
remove the fan protector, starting pulley and "V" beltNOTE: The upper breaker point controls the timing of the magneto side piston and the lower breaker pOint control the P.T.Oside piston3Rotate crankshaft until breaker pointsvisible through magneto ring opening are fully openAdjust points setting to 0.35 mm 0.05 (.014" .002) using
a feeler gauge and screwdriver, as illustrated
Too late: Turn armature plate counter-clockwise
Repeat procedure for other pointAdjust both side equally
7Disconnect timing instrument wire from blue wire then
reconnect it to the bluered wire (PTOside) leading from engineRotate crankshaft until PTOside piston approaches top dead centerAs soon as timing marks aligntiming light should fluctuate, or tone signal sound level should varyIf necessary to adjust, proceed as follows: If timing is too early decrease breaker points gap toward lower limit, i.e0.30 mm (.012"), then