1972 Ski-Doo Shop Manual, Page 164Get this manual
2-06-01 Engine
ENGINE TIMING 2-6
ONE CYLINDER
1Disconnect spark plug wire and remove spark plug from cylinder head2Remove rewind starter assembly from engine by removing four (4) capscrews and washers3Remove the starting pulley from magneto ring plateNOTE: On electric start engines, the magneto ring plate incorporates the fan and starting gear4Inspect breaker points condition, if pitted, burnt, or worn, replaceNOTE: Breaker points can be cleaned by inserting piece of paper between the points and movirrg it between the contact surfaces5Rotate crankshaft until visible through the magneto fully open positionAdjust .018 inch using feeler gauge (fig2-6-1)breaker points, ring plate, are in points setting to and screwdriver 7When using T.D.Cgauge, install and adjust the gauge as follows: a) Rotate crankshaft until piston is just before T.D.C(Top Dead Center)b) With gauge in adaptOr, adjust roller so that it is parallel witb dial faa=nghten roller lock nut (fig2-2)