Ultra Start 45xx Series Manuale Utente

COMPETITION CARBURETORS MODEL 4500 ULTRA HP DOMINATOR SERIES Installation and Adjustment Instructions P/N 199R10595 CONGRATULATIONS on your purc

10 Power Valve Channel Restrictions (PVCR): These two restrictions are visible when the power valve is removed. They meter the flow of additional fu

11 AIR BLEEDS: Experimenting with air bleeds is not recommended and should only be attempted by an expert carburetor tuner. Countless hours of test

12 NOTE: See Figure 11 for air bleed locations and identification. It is recommended that all jet sizes be documented before any tuning of the air

2 REMOVAL OF OLD CARBURETOR: WARNING! Prior to and after installing your new carburetor, manually operate the throttle lever, checking for any sti

3 INSTALLATION OF NEW CARBURETOR: WARNING! Holley Performance Products highly recommends that a quality fuel filter be installed with any replaceme

4 FUEL LEVEL (FLOAT LEVEL) FOR ULTRA HP DOMINATOR SERIES: The floats control the fuel delivery. However, if the float(s) is not properly adjusted,

5 IDLE SPEED SCREW: The idle speed screw controls the throttle plate position at idle, which in turn raises or lowers the engine rpm. Here are the

6 IDLE MIXTURE SCREWS: Your carburetor will have four idle mixture screws; one for each venturi. This is known as four-corner idle. If you change

7 Figure 5 Figure 6 Figure 7 1. Change the pump

8 ADJUSTABLE LINKAGE: The external linkage on the Ultra Dominator is adjustable for Soft progressive, intermediate progressive, progressive, and 1 t

9 4. Holley jets are broached, flowed, and stamped according to flow rate. Never drill jets, this seriously alters flow characteristics. Stamped n