Carburetor: Description and Operation

Carter Thermo-Quad model exploded view:

Fig. 1 Carter Thermo-Quad carburetor assembly. 1983-84:

The Carter TQ (Thermo-Quad) carburetor, Fig. 1, is unique in design in that it has a black main body or fuel bowl of molded phenolic resin. This acts as an effective heat insulator. Fuel is kept cooler by approximately 20° F than in carburetors of all metal design. Another reason for the lower operating temperatures is its suspended design metering system. All calibration points with the exception of the idle adjusting screws, are in the upper aluminum casting or air horn assembly and are in effect suspended on cavities in the plastic main body.