1972-1981 Polaris Snowmobiles Master Repair Manual, Page 215Get this manual

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ENGINE ELECTRICAL Timing Chart Degrees BTDC 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 55.6MM Stroke Inches MM .0053 .0211 .0475 .0845 .1320 .1900 .2585 .3374 .4267 .5264 .6364 .75

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