1970-1973 Ski-Doo Snowmobiles Technical Data Manual, Page 8Get this manual
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1971 MODEL
NORDIC 640E TWO 2x76 M.M2x70 M.M635 C.c9:1 100-34
SKANDIC ONE 78M.M30M.M335 c.c8: 98-34 34 33 335 1242sq.in.270 18" 1233 Manual 40W M-240-T-1.018"-.022" .014"-.018