1970-1979 Ski-Doo Snowmobiles Service Manual, Page 42Get this manual
PERIODIC MAINTENANCE AND TUNE-UP
12345Air flow meter Tube in vertical position Idle adjustment screw Air flow control Float
10Install air intake silencer and start engineWarm up engine to operating temperature and check idle speedAdjust throttle stop screw as necessary for specified idle speedOn carburetor models, ensure that both throttle stop screws are adjusted an equal amountCAUTION Do not use pilot air screws to attempt to set engine idle speedPilot air screws must be set as specified in Table 8, or "too lean" mixture and subsequent engine damage may result
Carburetor Adjustment and Synchronization to