1970-1973 Ski-Doo Snowmobiles Technical Data Manual, Page 14Get this manual
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1972 MODEL( 35
ALPINE 640ER
Two 2x76mm 2x70mm 635.1cc 9:1 Electric 113-14" 35" 39-14" 596 2160sq.in0.277 15" 1329 Standard 120W M-280-T-31 .020" .014".018" gals6.25 gals201 Disc Opt