1980 Ski-Doo Shop Manual, Page 150Get this manual
SECTION 03 SUB-SECTION 03, (IGNITION TIMING)
NOTE: Breaker points gap can change upon tIghteningAlways recheck after tightening
Unlock outer ring of dial and turn It until "0" on dial aligns with pointer
e Lock outer ring in position6Slacken the three (3) armature plate ret ining screws and turn timing instrument ON
7Rotate magneto
counterclockwise
until piston is at
ENGINE TYPE
247 (direct)
277 (indirect)
3.98 mm 0.25 (.157" ,010) 2,60 mm 0,25 (.102" ,010)
4Disconnect junction block at engine then connect one lead of timing Instrument (flashlight type) or tone timer, to the blue wire coming from engineConnect other wire to ground (metallic portion of the engine)
B,T.D.C before top dead center, Slowly rotate armature plate until timing light fluctuates or until tone signal sound level variesRetighten retaining screws