1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 88Get this manual
CARBURETION (VVALBRO) 22Position the fuel pump cover over the fuel inlet gasket and secure all components to the carburetor body with four (4) cover screwsclose (lean mixture) and counterclockwise to open (rich mixture), lean mixture results in too little fuel and an excessive amount of airA rich mixture results in excessive fuel and to little air
Approximate Walbro carburetor settings for engines used in 1972 Arctic Cat snowmobiles are as follows: High Speed 340,399,440 Kawasaki (Walbro WD) 1-14 Low Speed