1970-1973 Ski-Doo Snowmobiles Technical Data Manual, Page 37Get this manual
CARBURETOR ADJUSTMENTS WARNING: Engine should be turned OFF to perform all carburetor adjustments
1970 MODELS
CARBURETOR SPECIFICATION CHART LOWSPEEO ADJ+ 'H-OTURN HIGH SPEED OJ+ ;'8 -OTURN
CARBURETOR (TILLOTSON)
MAIN FUEL JET CIA
OL YMPIQUE 123 OL YMPIQUE 335, 335E OL YMPIQUE 399 T'NT292 T'NT340 NORDIC 399, 399E NORDIC640E T'NT399 T'NT640 ALPINE 399, 399ER ALPINE 640ER