[Tom Vaught]

Good Morning, More on the Holley #4224 Center Squirter Carbs

Picture #11 shows a nice example of the "Square Window" that many say is ideal for the Transfer Slot vs Throttle Blade Position on the Holley Primary Side of the carb.

Picture #12 shows the Secondary side of the carb Air Horn area. It also shows that the Air Bleeds are fairly close in size.
Typically the Idle Air Bleeds here are a few thousands of a inch larger vs the High Speed Bleeds which many times are .025" in diameter.

Picture #13 Shows the Primary Side of the carb.
You can see that the Idle Air Bleeds (ones on the outside positions are larger -typically in the .070" range) vs the High Speed Air Bleeds (in the .028" range).

Picture #14 Shows the Accelerator Pump Cam for the Carb which used the 50cc (per 10 strokes) Pump and Diaphragm.
The Pump Arm is visible, the cam, and the Idle Set Screw are shown.

Picture #15 shows The Secondary Blade Position Screw (which keeps the Throttle Blade from "digging into" the Carb Base Plate.
It also shows that the the adjustment for the Blade location must be done with the carb removed as the Hex Opening for the allen screw is on the bottom of the carb. Some move that hex opening to the Top of the Throttle Base but if you use the Idle Eze type drilling in the Plug (right next to the screw) there is no need to ever move the screw.

I drill the Plug for a .060" opening initially and then increase the size slightly until I get the idle rpm I want. Most times you will have two carbs so you can start at .045" drilling and then go up by .010" using a precision drill set to get the right idle speed.
Do not touch the normal idle set screw once you have the Primary Blade position set for the Transfer Slot "Window" opening.

More pictures later today or tomorrow.

Tom V.