You are here: Home > Tech Info > Weber Carbs

Weber Carburetor Parts

Check out our wide selection of available Weber Kits, including replacement jets and venturii. Create an Account with us, and order online today!

Weber Jetting Chart

This Jetting Chart provides a base line starting point. Every engine responds differently, and final jetting changes are most often determined by the engine builder or tuner. Engine size, cam, cylinder heads, ignition system, compression ratio, exhaust system, type of fuel, the vehicle and type of driving are all key elements in final calibration. The selection of main gas and air correction jets is determined by venturi size. The venturi sizes listed below are the sizes supplied by Weber in new carburetors. The use of larger venturi will increase airflow, and larger main gas jets than noted below will be required.

WEBER 40 IDF

Factory
Sizes

Single
Carb

Dual
Carbs

AIR CORRECTION

2.00

1.60

2.00

EMULSION TUBE

F-11

MAIN JET

1.15

1.45

1.30

PUMP JET

.50

.80

.50

IDLE JET

.50

.65

.55

VENTURII

28mm

NOTE: Drill 2mm Hole in each Throttle Valve of Single Carb.
 

WEBER 44 IDF

Factory
Sizes

Single
Carb

Dual
Carbs

AIR CORRECTION

1.75

1.65

2.00

EMULSION TUBE

F-11

MAIN JET

1.35

1.60

1.55

PUMP JET

.50

.80

.50

IDLE JET

.50

.65

.60

VENTURII

36mm

NOTE: Drill 2mm Hole in each Throttle Valve of Single Carb.
 

WEBER 48 IDF

Factory
Sizes

Single
Carb

Dual
Carbs

AIR CORRECTION

1.80

1.80

2.00

EMULSION TUBE

F-2

MAIN JET

1.50

1.70

1.75

PUMP JET

.50

.80

.50

IDLE JET

.55

.65

.60

VENTURII

40mm

NOTE: Drill 2mm Hole in each Throttle Valve of Single Carb.
 

WEBER 34 ICT

Factory
Sizes

Single
Carb

Dual
Carbs

AIR CORRECTION

1.60

N/A

1.60

EMULSION TUBE

F-78

N/A

MAIN JET

1.30

N/A

1.35

PUMP JET

.50

N/A

.50

IDLE JET

.52

N/A

.60

Weber Carburetor Parts

NOTE: Please specify exact sizes when ordering Jets & Venturi.

IDF Idle
Jets
#6394

IDF Main
Gas Jets
#6398

IDF Air
Correction Jets
#6389

IDF Carburetor
Base Gaskets
40 #2700 /
44 #2709 /
48 #2702

IDF Carburetor Rebuild
Kit (40, 44, & 48)
#6362

DCOE Idle
Jets
#6451
DCOE Main
Gas Jets
#6398
DCOE Air
Correction Jets
#6389
DCOE Carburetor
Base Gasket
40 #2705
45-48 #2702
DCOE Carburetor
Rebuild Kit
(40, 45 & 48) #6364
Not
Available
DCNF Idle
Jets
#6450
DCNF Main
Gas Jets
#6399
DCNF Air
Correction Jets
#6390
DCNF Carburetor
Base Gasket
#2739
DCNF Carburetor
Rebuild Kit
(40, 42, & 48) #6361
Not
Available
Not
Available
Not
Available
Not
Available
IDA Idle
Jets
#6357
IDA Main
Gas Jets
#6398
IDA Air
Correction Jets
#6389
IDA Carburetor
Base Gasket
#2701
IDA Carburetor Rebuild Kit - 48
#6363

Emulsion Tubes

F-2
#6353

44 IDF Venturi

40 IDF
Venturi
#6395

44 IDF
Venturi
#6356


Carburetor
Flow Meter

F-7
#6352

F-11
#6354