1970-1979 Ski-Doo Snowmobiles Service Manual, Page 11Get this manual
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4 Table WIND CHILL FACTORS Actual Thermometer Reading (0 F) Estimated Wind Speed in MPH 50 40 30 20 10 -10 -20 -30
-70 -85 -96 -104 -109 -113 -116
1-83 -99 -110 -118 -125 -14