1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 75Get this manual
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ENGINE SERVICING (WANKEL KM914B) Timing the Ignition Spark Advance: Contact Breaker Gap: Pole Shoe Gap: Measuring Instruments: 10 12 before to? dead center 0.016 0.002 in(0.40.05 mm) 0.590 0.748 in(15