1990-1998 Arctic Cat Snowmobiles Repair Manual, Page 137Get this manual
ADJUSTMENTS FOR SPECIAL USE
cPilot jets are identified by numberPilot jets with larger numbers will flow more fuel than jets with smaller numbersInstalling jets with larger numbers will richen the fuel mixturedWhen operating the snowmobile in relatively warm weather or at higher altitude, tum the pilot air screw counterclockwiseWhen operating the snowmobile in excessively cold weather conditions, tum the pilot air screw clockwise to richen the mixture1Open the hoodNOTE Figure shows the carburetor removed for clarity
In addition, the pilot air screw controls mixture adjustment when the throttle is opened from idle to the full open position quickly and when the engine is run at half-throttleNote the following when adjusting the pilot air screw: aTurning the pilot air screw clockwise closes the pilot air and richens the fuel mixture at idlebTurning the pilot air screw counterclockwise leans the fuel mixture
Throttle valve