Demon Fuel Systems 5563020GC - Manual (Page 4)

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Primary and secondary butterflies should be open equal amounts, and never seated tightly against
the throttle bores in the baseplate. Butterfly position is adjusted using the idle set screws (Fig. 5a &
5b) in the baseplate. Turn the screws clockwise to open the butterflies, or counterclockwise to close
them down. Be sure to note the adjusted position of your model carburetor, as this can be important
information used later during fine tuning.
Figure 5a Figure 5b
Curb Idle Mixture Screws
The curb idle mixture screws (total of 4) are located on each side of the metering block (Fig. 6).
These screws control the amount of idle fuel mixture that will be discharged into the plenum from the
curb idle ports located in the baseplate. These screws have been set during wet-flow testing at the
factory and it is recommended that they remain in place as delivered for initial start-up.
Keep in mind that these settings are only a starting point, and that additional fine tuning may be
required once the engine has warmed up to operating temperature.
Figure 6
Bolting the Carburetor to the Manifold
After the linkage and baseline settings have been checked, the carburetor is ready to be bolted to the
manifold. Be sure to use the supplied gasket. The carburetor should slide easily over the studs. Do
not force the carburetor if it hangs on the studs. If the carburetor does hang up, check for bent or
improperly installed studs. Replace the studs if necessary. Once the carburetor is seated against the
gasket, check to see that it sits squarely on the mounting flange.