1974 Ski-Doo Shop Manual, Page 249Get this manual
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MODEL ENGIN TYPE CARBURETOR MAIN FUEL JET DIA.0.42" .0.44" .0.44" .0.51"-
440640434 640434 346 396 436
.0.67" .0.54" .0.73" .0.58 "
HD-140'-A 2XHR-149-A 2XHD-123