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CARBURETOR REBUILD KITS

190003 (Vacuum Secondary) & 190004 (Mechanical Secondary)

Models – Demon™ Carburetors, Holley 4150™ & 4160™, & BG Claw

LIT700

INSTRUCTIONS:

Before getting to the actual rebuild, it should be noted that the carbs shown here are Demon™ Series

carburetors. It may not be identical to the carb on your engine, but it will be very similar. All Demon™

and HOLLEY® four barrels (with the exception of the 4360 Q-Jet replacement & 4010/4011), may be

disassembled the same way. A few parts differ here and there, but that doesn't alter the rebuild

procedure.

You will need the following tools to complete the rebuild:

 5/16" nut driver

 Standard & Phillips Head screwdrivers

 5/8" open end wrench for the float adjusting nut and fuel line fitting on some models (an 11/16"

open end wrench might be required in some cases)

 1" socket for the power valve and a 1" open end to remove the fuel inlet adapter fitting

 Needle nose pliers will help in removing small retaining clips and pins

 Clutch-type screwdriver to loosen the secondary metering plate screws used on Model 4160™

carbs (the ones that do not have replaceable secondary jets)

 Open end 3/8" and/or a 7/16" wrench to adjust the accelerator pump override spring

 1/4” and 9/64 Allen wrenches

Demon™ and HOLLEY® Four Barrels are actually an easy carburetor to rebuild because of their

construction. If you group everything in subassemblies, it is hard to go wrong. When you reassemble

the carburetor, install all of the parts on the metering block, and then set it aside. Do the same with

the fuel bowl, main body, and the throttle body assemblies. When all of the subassemblies are

completed, you will only have six pieces to bolt together to complete the assembly process.

Reassembly is done by simply reversing the disassembly steps. Before installing the carburetor on

the intake manifold, rotate the idle mixture adjusting screws clockwise until they lightly bottom out in

the metering block. Then, turn 1 and ½ turns to get the initial idle setting in the. Also, adjust the

Summary of content (8 pages)

PAGE 1
CARBURETOR REBUILD KITS 190003 (Vacuum Secondary) & 190004 (Mechanical Secondary) Models – Demon™ Carburetors, Holley 4150™ & 4160™, & BG Claw LIT700 INSTRUCTIONS: Before getting to the actual rebuild, it should be noted that the carbs shown here are Demon™ Series carburetors. It may not be identical to the carb on your engine, but it will be very similar. All Demon™ and HOLLEY® four barrels (with the exception of the 4360 Q-Jet replacement & 4010/4011), may be disassembled the same way.
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accelerator pump override spring by tightening the nut until some clearance is visible between the bolt head and pump lever. Back the nut off until all clearance is removed and then rotate it another 1/8 turn. Setting the initial float level may be done easily by inverting the fuel bowl (before it is installed). Run the new fuel inlet (needle & seat) assembly in until the top of the float is parallel with the roof of the fuel bowl.
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Figure 2 4. The plastic baffle installed in the fuel bowl should be removed and reinstalled when the carburetor is assembled. This baffle is essential to proper float operation and should not be left out. Dual feed bowls utilize the inlet cavity as a baffle, so a separate piece is not required. 5. Removal of four Phillips screws allows the accelerator pump housing to be lifted from the fuel bowl (Fig. 3). The pump diaphragm is located below this cover.
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Figure 4 8. The idle mixture screws should also be removed from the sides of the metering block (Fig. 4). There is a small cork gasket surrounding each of the screws, and it should also be pulled out of the recess in the block. The Rebuild Kit comes with rubber o-rings to replace the cork gaskets for a more positive seal. Some HOLLEY® carbs contain a "reverse-idle" system and a tag is affixed to the block showing that the mixture is made leaner by rotating the screws counter-clockwise.
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11. On vacuum secondary models, the diaphragm housing is attached to the main body by three screws and the diaphragm rod is held on the throttle shaft linkage by a retainer "C Clip". With these removed, the housing can be pulled from the main body (Fig. 6). Figure 6 12. The cork gasket on the rear of the diaphragm housing is also critical to secondary operation as it seals the vacuum passage between the housing and the main body. This can be discarded at this time, as your package includes a new seal (Fig.
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14. The accelerator pump discharge nozzle may be removed by loosening the Phillips head screw and inverting the main body over your hand (Fig. 9). When this is done, the nozzle, screw, and the discharge check needle should fall out. Care should be used in reinstalling the Phillips head screw so as to not strip out the threads. Figure 9 15. The final major disassembly step is to invert the carb and remove the six Phillips head screws that attach the throttle body to the main body.
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18. Reassemble the carburetor in the reverse order of disassembly. Ensure that all new gaskets are used and that all gasket surfaces are clean and free of any debris.
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Demon Carburetion™ Limited Warranty All Demon Carburetion™ Limited Warranties are extended to the original consumer only. This Limited Warranty is not assignable or otherwise transferable. There are no warranties that extend beyond those stated herein. Demon Carburetion™ offers no other warranties expressed or implied beyond this Limited Warranty. In the event of an alleged defect in material or workmanship, Demon Carburetions’™responsibility is strictly limited to repair or replace the defective product.