1985 Ski-Doo snowmobile Service Manual, Page 215Get this manual
Section 02 ENGINE Sub-section 11 (CARBURETORFUEL PUMP)
Tighten carburetor cover with the throttle cable adjuster jam nut unlocked, press the throttle lever against the handle gripAll models except Formula Plus By turning the cable adjuster, adjust the carburetor slide cut away so that it is flush with the top of the carburetor boreFormula Plus (VM 40) By turning the cable adjuster, adjust the carburetor slide, so that it is flush with the top of the carburetor outlet boreTighten the cable adjuster jam nutRepeat for the other carburetor,CAUTION: On twin carburetor models, make sure both carburetors start to operate simultaneously WARNING: It is important that the throttle slide adjustment be performed to ensure proper func tioning of throttle mechanism,CAUTION: On twin carburetor model with rotary valve (Formula MXFormula Plus) do not interchange carburetorsthe jetting is different on each sideOnce carburetor adjustment is performed, check that with the throttle lever fully depressed, there is free play of 116") between the cover(s) and throttle slideReadjust accordingly