1974 Ski-Doo Shop Manual, Page 135Get this manual
Leak test welch plugs by allowing controlled compressed air (max 50 P.S.I into the idle and high speed adjusting screw orificesThe carburetor must be inverted, welch plugs up, and drop or two of oil laying over each plugSm.all air bubbles indicate leakReseal with punch and hammer then leak test once again At assemblytorque the needle inlet seat to 25-30 inchlbAdjust the inlet control lever until the center of the lever contacting the metering diaphragm is flush with the metering chamber allTo adjust, bend lever as illustrated
Caution: Some solvents and cleaners have damaging effect on the synthetic rubber parts of the carburetorIt is best to use petroleum product for cleaningDo not use alcohollacqueracetonethinner, benzol or any solvent with blend of these ingredients unless the rubber parts and gaskets are removed If you are in doubt about the solventtest used part and observe the reaction Inspect all diaphragmsThey should be free of holes or imperfectionsReplace as needed Check inlet needle tip condition If worn, the inlet needle and seat must be replaced as matched setAfter assemblyleak test carburetor inlet needle as follows: With both idle speed and high speed adjustment screws open and fuel return outlet pluggedconnect leak detector to the fuel inlet (See Tool Section)