1989 Ski-Doo Repair Manual, Page 370Get this manual
Section 04 ELECTRICAL Sub-section 02 (IGNITION TIMING) Loosen adaptor lock nut then holding gauge with dial face toward magneto, screw adaptor in spark plug hole
Edge gap verification
By following either of the two procedures herein mentioned the edg gap should automatically be adjusted However, if the edge gap is to be verified, proceed as follows: From timing marks, rotate flywheel clockwise 14 of turn (hold advance mechanism centrifugal lever in full advance position toward magneto rim to perform dynamic edge gap verification), then slowly turn flywheel back counter-clockwise until timing instrument fluctuatesAt this point check the distance between generator coil end and magnet (edge gap), with non-magnetic strip of appropriate widthENGINE TYPE
- Slide gauge far enough into adaptor to obtain reading then finger tighten adaptor lock nut- Rotate flywheel until piston is at Top Dead Center- Unlock outer ring of dial and turn it until "0" (zero) on dial aligns with pointer- Lock outer ring in position Slacken the three (3) armature plate retaining screws and turn timing instrument ON