Demon Fuel Systems 421440 - Manual (Page 4)

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7. Insert the choke rod through the hole on the end of the bracket on the choke butterfly shaft (Fig.
7). Secure the rod with the 1/2" cotter pin.
Figure 7
8. Use the two Torx® head screws to secure the choke flap to the choke butterfly shaft (Fig. 8). The
flap has instructions stamped on its upper side. Make sure you can read the instructions and that
the arrow points towards the choke rod. NOTE: It is extremely important that the choke flap is
centered so it moves freely and does not bind. You may need to remove the flap to deburr the
edges if it binds and reinstall. Once the choke flap is centered and moving freely, remove the
Torx® head screws one at a time, place a drop of Loctite® 271 on them and reinstall. Wipe any
excess Loctite® off the screw heads or shafts before proceeding.
Figure 8
9. Install the endplate/spring combination. The spring slides into the u-shaped endplate with the fast
idle speed screw as shown in Figure 9 and then slide this onto the left (passenger) side of the
primary throttle shaft. When installed, the head of the fast idle speed screw should be facing
towards the base of the carburetor and the threads should be pointing upward. Now install the
outer bracket with the double D-shaped hole onto the end of the shaft (Fig. 10). It is advisable to
keep the long straight portion of the spring unhooked and after the outer bracket is secured with
the Phillips head screw to the shaft, use your little finger to lift the straight portion of the spring up
and drop it into the slot on the right side of the outer bracket. If installed properly you should be
able to push the fast idle speed screw forward (up) and have it return smoothly.