1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 83Get this manual
CARBURETION (VVALBRO) 7Grasp the carburetor and place thumb over the metering lever and metering lever springRemove the metering lever pin screwSlowly release thumb and allow the metering lever, metering lever pin, metering lever spring, and the inlet needle valve to disengage the castingNOTE: Metering lever spring may "fly out" if care is not exercised when components are removed1011Remove the high speed mixture needleRemove the low speed mixture needle
Remove the idle adjusting screw and springDisassemble the circuit plate from the carburetor body by removing the three (3) circuit plate screws