1974 Ski-Doo Shop Manual, Page 145Get this manual
Check inlet needle tip conditionIf worn, the inlet needle and seat must be replaced as matched setAfter assembly, leak test carburetor inlet needle as follows: With both idle speed and high speed adjustment screws open and fuel return outlet plugged, connect leak detector to the fuel inlet(See Tool Section) Maximum Throttle Opening
With engine off and air silencer removed, depress throttle lever at handlebar and holdThrottle butterfly should be horizontal when the lever gently touches the handlebar gripTo adjust for maximum opening, loosen screw at point where cable joins carburetor leverClamp throttle lever to handlebarWith finger, hold carburetor throttle lever in fully open position (UP), pull cable until taut and retighten screwUnclamp throttle lever from handlebar and install air silencerWarning: Before starting engine, carburetor throttle lever must return to idle position (throttle shutter closed)Do not start engine unless this is verifiedLow Speed Mixture Adjustment
A primary adjustmentengine off, should be made by first turning idle mixture screw fully clockwise until closed, then back off to specificationIdle Speed Adjustment