Demon 421440 User Manual

SPEED & ROAD DEMON ELECTRIC CHOKE KIT

#421440

CHOKE INSTALLATION INSTRUCTIONS

LIT702

Please make sure you have read and completely understand the instructions before you begin the
installation. Keep in mind that this installation should be done with the carburetor off of the engine. If
you have any questions, please feel free to call the Demon Tech Line for assistance at 270-901-

3346. Complete the installation as follows:

Figure 1

INCLUDED IN THIS BOX

1 - Electric Choke Pod 1 - 1/2” Cotter Key
1 - Choke Flap 1 - 1/2" Cotter Pin
1 - Choke Butterfly Shaft 1 - Phillips 1/4" Screw
2 - #8 x 32 TPI Torx® Head Screws 1 - Fast Idle Speed Screw Bracket assembly with spring
1 - Choke Rod 1 - 3/32" Allen Screw
1 - Nylon Main Body Block off plate 1 - Tube of Loctite® 271
6 - #8 Lock Washers 1 - Instruction Manual
3 - #8 1-3/4" Allen Screws 1 - Retaining Ring
1 - Choke Coil 3 - #8 3/8” Allen Retaining Ring Screws
1 - Choke Cap Gasket

1

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 the hole to make sure the choke rod doesn’t bind or hang.

2

Figure 4

4. Insert the nylon main body block off plate into the cut out slot in the side of the main body.

5. Insert the small end of the choke rod (Fig. 5) through the bottom of the nylon main body block off
plate towards the top.

Figure 5

6. Insert the choke butterfly shaft through the choke tower (Fig. 6). Make sure the choke butterfly
shaft moves freely before proceeding. If it does not you may need to deburr the hole(s) going
through the choke tower or use a 0.316" drill bit to make sure the hole is the proper size.

Figure 6

3