Demon Fuel Systems 1563010VE - Manual (Page 11)

11
Figure 14
With .020” showing, the transfer slot will give the appearance of a little square situated below the
butterflies (Fig. 15).
Figure 15
On engines that idle below 1,000 RPM, set the primary butterflies open to the .020” (square) as
described above, but the secondary butterflies should be set to the bottom of the transfer slot. In
other words, at idle speed the secondary transfer slots will not be visible when viewed from the
bottom, but any movement of the secondary butterflies will expose the slot.
The next step is to provisionally set the Idle-
Eze™. Insert a screwdriver through the air cleaner stud
hole to engage it, and turn the screw clockwise until the screw stops. Now, reverse it counter-
clockwise by 1-1/2 turns. This will serve as a good baseline.
Use a screwdriver through the air cleaner stud hole to control the engine’s RPM. Once the RPM is set
approximately and the engine is running at normal operating temperature, begin to adjust the idle-
mixture screws. Adjust the screws either in (leaner) or out (richer) until the engine reaches its
optimum idle. Adjustments in small increments of, say, approximately 1/4-of-a-turn at a time is
recommended. Once the idle mixture has been set, adjust the Idle-
Eze™ by using a screwdriver
through the air cleaner stud hole to reach desired RPM. Once satisfied, install the air cleaner stud
and air cleaner a
nd make sure its presence doesn’t change the idle settings or RPM. If it does, the
carburetor will require readjustment so it performs properly with the air cleaner installed. Once it does,
you’re finished and ready to enjoy your carburetor.
Fuel Pressure
Most gasoline powered engines usually require between 6 and 7-1/2 PSI fuel pressure. Gasoline
carburetors can be run either at idle or wide open throttle at these pressures. Be sure your fuel
delivery system is properly adjusted and able to maintain volume flow at these pressures. Improperly
adjusted or inadequate fuel delivery will result in poor performance and possible engine damage.
General Tuning and Component Information
Once you have completed the initial installation, and preliminary adjustments, you are now ready to
test the vehicle and evaluate any other possible tuning adjustments. Information on changing the
configuration or fuel metering of your Demon is also included in this section.