Jetting kits and jetpacs

In recent years the quality of our fuel has changed drastically in different regions of the United States. It changes from summer to winter and seems to be different in Los Angeles or Maine compared to Texas or Alaska. To keep up with the Government mandated leaner, oxygenated fuel, We have had to increase the size of the idle jets in our kits 3 times due to the leaner fuel.

A properly jetted carburetor, that worked well a couple of years ago, may have lost some of its performance due to today’s leaner fuels. Some symptom’s of a lean fuel condition are: needing to adjust the idle too high, rough idle, hesitation or a stumble on acceleration, a flat spot at around 2500 RPM and/or surging at a constant RPM in higher gears.

Along with leaner fuels, any modifications to an engine to improve performance can compound the lean effect and require more mixed fuel volume. Modifications could be as simple as: an opened or larger air filter, an open exhaust system, or ignition modifications. Some modifications could be as extensive as a larger camshaft, head modifications, headers, or increased engine displacement. Also, altitude & extreme temperature or humidity affects the air to fuel ratio. Any and all of these modifications are exaggerated when combined with the lean fuel.

Top-End Performance recognizes your need to have a variety of jets for all circuits available when tuning your engine. Our jet kits come with simple tuning instructions and a variety of jets to cover the stock and modified engine. We have designed these jet kits from years of experience jetting carburetors on engines all over the country with all types of modifications. If you are experiencing any of these symptoms from your Weber carburetor or simply want to improve the quality and performance from your engine, one of these kits is for you.

701 DGS
Click to Order


3 pair Idle Jets   3 pair Main Jets    3 pair Air Correctors Jets

JETTING AND TUNING WEBER CARBS....A Short Course
 

701 DGV4

4 Primary Idle Jets   2 Secondary Idle Jets   3 Main Jets

3 Air Corrector Jets   1 Single pump nozzle  1 Double pump nozzle

DGV4 Kit Contents  4 Cyl Seal Level to 2500 Ft.

JETTING AND TUNING WEBER CARBS....A Short Course
Want a Custom 32/36 DGV / DGEV Jet Kit Tailored to your Engine and Aplication ? Click Here

6 CYLINDER ENGINE JET KIT

701 DGV6     
DGV6 Kit Contents   6 Cyl Seal Level to 2500 Ft.

JETTING AND TUNING WEBER CARBS....A Short Course 

    32/36 DFEV / DFV

701 DFV

 5 Idle Jets    3 Main Jets    3 Air Corrector Jets

1 Single pump nozzle    1 Double pump nozzle

 JETTING AND TUNING WEBER CARBS....A Short Course

702 IDF-1

Dual-IDF’s LOW SPEED CIRCUIT JET’s  4 sizes Idle Jets @ 4 each   
2 ZERO Pump By-pass valves      4 Pump Jets

702 IDF-1 Contents  SINGLE CARB

Quantity	Idle Jets	Quantity	By Pass	Quantity	Pump Jet
2 each	74405.055	1 each	79701.000	2 each	76210.055
2 each	74405.060
2 each	74405.065
2 each	74405.070

 JETTING AND TUNING WEBER CARBS....A Short Course

702 IDF-2

702 IDF-2 Contents  DUAL CARBS

Quantity	Idle Jets	Quantity	By Pass	Quantity	Pump Jet
4 each	74405.055	2 each	79701.000	4 each	76210.055
4 each	74405.060
4 each	74405.065
4 each	74405.070

JETTING AND TUNING WEBER CARBS....A Short Course 

701 ICT

Dual ICT’s

3 pair Idle Jets    3 pair Main Jets

3 pair Air Corrector Jets   2 ZERO Pump By-pass valves

Quantity	Pri Idle Jet	Quantity	Main Jet	Quantity	Air Jet	Quantity	By Pass
2 each	74409.065	2 each	73801.145	2 each	77201.170	2 each	79701.000
2 each	74409.070	2 each	73801.150	2 each	77201.180
2 each	74409.075	2 each	73801.155	2 each	77201.190

JETTING AND TUNING WEBER CARBS....A Short Course 

Performance Main and Air Jet Kits For IDF & DCOE

These jet kits contain mains and air jet ranges developed around traditional calibrations, based on Venturi and engine displacements. Kits should provide a range of calibration flexibility to help tune most applications
Our single carburetor Jet Boxes  (737 series) are supplied with: 4 sizes of main jets with 2 each, 4 sizes air jets, with 2each. 2-emulsion tubes (F7) for the IDF Our dual carburetor Jet Boxes (737 series) are supplied with: 4 sizes of main jets with 4 each,4 sizes air jets with 4 each. NOTE: The Below Main Jet Kits are for IDF or DCOE
737-144    Single 40/44/45mm carburetor, venturi range 28-32mm, Typical displacement of up to 1900cc Quantity Main Jet Quantity Air Jet Quaintity E.T. 2 each 73401.120 2 each 77401.160 2 each 61450.091 2 each 73401.130 2 each 77401.170     2 each 73401.135 2 each 77401.180     2 each 73401.145 2 each 77401.185	mains: 120, 130, 135, 145   air jets: 160, 170, 180, 185   2-F7 emulsion tubes for the IDF
737-240     Dual 40/44/45 mm carburetors, venturi range 28-30mm Typical displacement of 2000cc and larger Quantity Main Jet Quantity Air Jet 4 each 73401.110 4 each 77401.180 4 each 73401.120 4 each 77401.190 4 each 73401.125 4 each 77401.210 4 each 73401.130 4 each 77401.215	mains: 110, 120, 125, 130   air jets: 180, 190, 210, 215
737-244    Dual 44/45/48mm carburetors, venturi range 34-36mm Typical displacement of 2000cc and larger  Quantity Main Jet Quantity Air Jet 4 each 73401.130 4 each 77401.170 4 each 73401.140 4 each 77401.180 4 each 73401.145 4 each 77401.185 4 each 73401.150 4 each 77401.190	mains: 130, 140, 145, 150   air jets: 170, 180, 190, 200
737-248    Dual 44/45/48mm carburetors, venturi range 38-40mm Typical displacement of 2000cc and larger Quantity Main Jet Quantity Air Jet 4 each 73401.145 4 each 77401.175 4 each 73401.155 4 each 77401.190 4 each 73401.160 4 each 77401.200 4 each 73401.165 4 each 77401.210	mains: 145, 155, 160, 165   air jets: 175, 190, 200, 210

JETTING AND TUNING WEBER CARBS....A Short Course