1980 Ski-Doo Shop Manual, Page 18Get this manual
SECTION 02 SUB-SECTION 03-03, (IGNITION TIMING)
1980 IGNITION TIMING SPECIFICATIONS
ENGINE TYPE IGNITION TYPE DIRECT MEASUREMENT B.T.D.CINDIRECT MEASUREMENT B.T.D.CEDGE CAP
247 Breaker
3.98 mm 0.25 (.157" .010)
7-10 mm (.275-394") 812 mm (.315-.4 72")
Breaker
2.60 mm 0.25 (.102" .010)
1.39 mm 0.25 (.055" .010) 2.07 mm 0.25 (.081" 01O) 2.35 mm 0.25 (.093" 01O) 1.39 mm 0.25 (.055" .010) 2.07 mm 0.25 (.081" 010) 2.07 mm 0.25 (081" 10)