Demon Fuel Systems 421440 - Manual (Page 2)

2
You will need the following tools to help with the installation:

Small Hammer

Small Drift (punch)

3/32" Allen Wrench

9/64" Allen Wrench

#2 Torx Driver

.316 Diameter Drill

Deburring Knife

Needle Nose Pliers

Small Flat Blade Screw Driver

Phillips Head Screw Driver

Small File
INSTALLATION
1. Remove the carburetor
from the vehicle and drain any fuel into a “fuel safe” container.
2. If your carburetor is a Speed Demon Twin Squirter (mechanical secondary), it is equipped with a
slotted screw to control the secondary butterfly position (Fig. 2). This must be changed to the
3/32" Allen screw (Fig. 3) included with the kit (if you do not, the linkage can bind). This will require
you to reset the secondary throttle shaft. Set the secondary butterflies to the bottom of the transfer
slot so you cannot see any of the slot at idle (butterflies closed), but with any movement of the
secondary butterflies you will begin to see the slot. (Refer to your Demon carburetor instruction
manual for further information.)
Figure 2 Figure 3
3. Using a small drift pin punch (Fig. 4), knock out the sealing slug on the right side of the choke horn
in the main body. It is precut at the factory and should press out very easily. Once you’ve removed
the slug, deburr t
he hole to make sure the choke rod doesn’t bind or hang.