Demon Fuel Systems 4402020VE - Manual (Page 4)

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Figure 4a Figure 4b
Curb Idle Mixture Screws
The curb idle mixture screws (total of 4) are located on each side of the metering block (Fig. 5 & 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 5 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 a new 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 make sure it is sitting squarely on the mounting flange.
The carburetor should not be able to be rocked diagonally. A carburetor that rocks is an indication
that the manifold or carburetor spacer could be warped. This must be corrected before the carburetor
is bolted down. When the carburetor sits squarely, it is safe to install nuts and washers. Be sure all