1974 Ski-Doo Shop Manual, Page 126Get this manual
TWO CYLI NDER ENGINE-BREAKER POINTS TYPE FOREWORD
For timing purposes, it is necessary to separate the breaker points type of twin cylinder engines into three groupsGROUP I: This group includes engine type 248 and 294
4Rotate crankshaft until breaker points, visible through magneto ring opening, are fully openAdjust points setting to .014".018" using feeJer gauge and screwdriver, as illustratedRepeat procedure for other set of pointsNote: The upper breaker points set controls the timing of the magneto side piston and the lower breaker points set control the PT0side piston5Disconnect junction block at engine, then connect one lead of timing light (flashlight type or of tone timer), to the blue wire (mag side) leading from engineConnect other wire to fan cowl (ground) 6Turn timing instrument ONRotate crankshaft until magside piston approaches top dead center and timing marks alignSlacken breaker points retaining screw then using screwdriver, twist breaker points from one side to the other until timing light fluctuates (from dim to bright) or tone signal is no longer heard Retighten retaining screw at,this position