1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 87Get this manual
CARBURETION (NALBRO) 14Place dimple in metering lever over the metering lever spring and insure the inlet needle valve slides into the inlet needle seatHold components in place and secure to carburetor body with the metering lever pin screw17Place the fuel pump gasket and the fuel pump diaphragm over the metering diaphragm plate
1815Position the metering diaphragm on the carburetor bodyNOTE: The light gray side of the diaphragm must face toward the carburetor body19
Position the fuel pump plate on the fuel pump diaphragmNOTE: Two dime sized recesses in the fuel pump plate must fit directly over the red vapor pump valve and the cone shaped pressure spring located under the fuel pump diaphragm and gasketPlace the fuel pump check valve gasket and the diaphragm check valve on the fuel pump platePosition the filter plate over the diaphragm check valveNOTE: Circular recess of filter plate must face outward