Demon Fuel Systems 5563020GC - Manual (Page 13)

13
Air Bleeds
The screw in air bleeds, located in the upper bowl portion of the main body between the wall and the
venturii, shape the fuel curve by helping to control when the idle and main circuits start. The four (4)
idle air bleeds are located closest to the air cleaner ring, while the four (4) high speed air bleeds are
found on either side of the squirter bosses. A larger bleed can be used to slow down, or delay, the
related circuit, and vice-versa for a smaller bleed. As with the emulsion bleeds, tuning with the air
bleeds should be done only by someone with a deep understanding of carburetion to prevent a poorly
operating carburetor. If air bleeds are changed, be careful not to drop them down the venturi or
serious engine damage can occur.
Squirters
There are two types of squirters; regular and tube type. The tube type squirters are easily identified
by the short tubes extending from the exit orifice of the squirter. The exit orifice diameter of either type
squirter controls the duration of the pump shot. The smaller the diameter, the longer it will take for the
complete volume of the pump to discharge. A larger diameter discharges the pu
mp’s volume quickly.
This is assuming no changes in pump cams.
Secondary Throttle Linkage
There are two styles of secondary connecting links for a Demon; one to one and progressive. The
one to one link, which is the longer of the two links, opens the secondaries at nearly the same time
and rate as the primary throttle blades. The progressive link allows the primary blades to open about
1/3 of their total travel before the secondaries begin to open. The one to one link is installed in the
lower of the two holes on the primary throttle linkage, while the progressive is installed in the upper
hole. Both links install into the oval slot on the secondary and are secured by a small washer and
cotter pin.
Mighty Demon carburetors are supplied with the progressive link.
Figure 17
A change in these links has its greatest effect on drivability. The one to one link produces an
increased availability of air/fuel to the engine earlier. The progressive link delays this availability until
later in the linkage travel. Both have their advantages. The choice is up to the individual driver.