Quick Fuel Technology 4500 Shaft Kits User Manual

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14. Turn the carburetor over, then place a drop of thread lock liquid in each throttle plate screw hole. This will

enable the thread lock to penetrate the threads in the shaft.

15. Tighten the screws until the head just makes contact with the plate, then back it off ¼ turn. Open the

throttle shaft and by quickly releasing the lever allow the shaft to snap closed by the spring. This helps
center the plates in the bores. Slightly tap the leading edge of the plate (forward of the shaft) with a
screwdriver handle.

16. Apply thread lock liquid to the intermediate linkage Allen Head cap screw. Install this screw, thread in but

do not tighten. Leave a little gap between the head and intermediate linkage collar.

17. Holding the throttle lever in one hand, move the throttle shaft in and out of the main body. Try to position

the shaft so it is half way between this distance. Look at the intermediate collar to check for clearance on
either side to the main body. If the gap on one side looks wider, try to reposition the shaft so the gap is
more uniform.

18. Tighten the throttle plate screws and the intermediate linkage screw. Check for free throttle operation. The

operation should be free and smooth. If not, loosen the screws and repeat steps 15 thru 17.

19. Repeat the above process for the other shaft.
20. Install the accelerator pump cams. Operate the throttle to be certain the operation is smooth and closes with

the throttle shaft springs.

21. Re-set the idle speed screws. NOTE: The throttle shafts should be opened the same amount primary and

secondary. Open the throttle shaft until the transfer slot is visible. Back the idle speed screw off ¼ turn.
This will be a good baseline setting that can be fine tuned once it is on the engine. When adjusting the idle
speed, turn both shafts an equal amount.

This is an involved process but not too complicated if the above instructions are followed.

Quick Fuel Technology, Inc., 129 Dishman Lane, Bowling Green, KY 42101
1-270-793-0900 phone no.,

1-270-793-0951 fax no.