2003 Ski-Doo ZX Series Factory Shop Manual, Page 180Get this manual
Subsection 10
Section 04 ENGINE (CARBURETOR AND FUEL PUMP)
Throttle Slide Height (preliminary idle speed adjustment)
Hook throttle cable into the needle retainer plateNOTE: Do not obstruct hole in throttle slide when installing needle retaining plateThis is important to allow air escaping through and thus allowing quick response1 2
Using drill bit, adjust throttle slide height (see following table) by turning idle speed screw no7Throttle slide height is measured on outlet side of carburetor (engine side)NOTE: Make sure that throttle cable does not hold throttle slideLoosen cable adjuster accordinglyFinal idle speed adjustment (engine running at idle speed) should be within 12 turn of idle speed screw from preliminary adjustmentMODELS THROTTLE SLIDE HEIGHT (drill bit size) 0.1 mm.004 in) 1.6 (0.063)