Demon Fuel Systems 1563010VE - 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. 5) 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 5
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