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Jets

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Jet type
Main Pilot Powerjet Choke
Carburetor fitment
Bing BVF Dell'Orto 5mm Dell'Orto 6mm Dell'Orto SI Dell'Orto VHST Gurtner/Weber Keihin / CVK M4 Keihin / CVK M5 Mikuni PHBG Polini CP PWK
Brand
Swiing Dell'Orto Gurtner S.A Malossi Mikuni MotoForce MotoForce Racing Naraku Polini Stage6 Standard Parts Weber
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Standard Parts
Main jet set x10 Bing 96 - 113
Article no.: SP-93863

Main jet set x10 Bing 96 - 113

16,00 €
Currently not in stock
Standard Parts
Main Jet Set 7-part M5 85-115 BVF carburetor Simson S51
Article no.: MOF-49165

Main Jet Set 7-part M5 85-115 BVF carburetor Simson S51

8,90 €
Currently not in stock
Standard Parts
Main Jet Set 7-part M5 72-80 BVF carburetor Simson
Article no.: MOF-49164

Main Jet Set 7-part M5 72-80 BVF carburetor Simson

9,30 €
Currently not in stock
Polini
Jet Set 5 idle jets Polini Dell'Orto SI 55-58-60-62-65/160
Article no.: P373.0002

Jet Set 5 idle jets Polini Dell'Orto SI 55-58-60-62-65/160

29,50 €
Currently not in stock
RRP
33,00 €
-11% Discount
Malossi
Jet / Reeds / Needles Malossi Peugeot Fox / Honda Wallaroo
Article no.: M202933B

Jet / Reeds / Needles Malossi Peugeot Fox / Honda Wallaroo

20,50 €
Currently not in stock
Gurtner S.A
Jet 70 Gurtner d.12 mm Peugeot 103
Article no.: CGN512320

Jet 70 Gurtner d.12 mm Peugeot 103

6,20 €
Currently not in stock
Standard Parts
Jet Reamer Set
Article no.: MF99.00802

Jet Reamer Set

67,50 €
Currently not in stock
Polini
Main Jet Set Polini Mikuni 280 - 370
Article no.: P380.0005

Main Jet Set Polini Mikuni 280 - 370

32,50 €
Currently not in stock
RRP
35,00 €
-7% Discount
Polini
Main Jet Set Polini 80 - 125 for Mikuni TM / TMX / VM
Article no.: P380.0002

Main Jet Set Polini 80 - 125 for Mikuni TM / TMX / VM

31,00 €
Currently not in stock
RRP
35,00 €
-11% Discount
Polini
Main Jet Set Polini 180 - 270 for Mikuni TM / TMX / VM
Article no.: P380.0004

Main Jet Set Polini 180 - 270 for Mikuni TM / TMX / VM

34,00 €
Currently not in stock
RRP
35,00 €
-3% Discount
Polini
Main Jet Set Polini 130 - 175 for Mikuni TM / TMX / VM
Article no.: P380.0003

Main Jet Set Polini 130 - 175 for Mikuni TM / TMX / VM

35,00 €
Currently not in stock
Naraku
Main Jet Set Naraku M4 110-130 - 11 pcs.
Article no.: NK200.09

Main Jet Set Naraku M4 110-130 - 11 pcs.

18,00 €
Currently not in stock
Gurtner S.A
Jet Gurtner 66 Peugeot d.12mm
Article no.: CGN506921

Jet Gurtner 66 Peugeot d.12mm

6,30 €
Currently not in stock
Standard Parts
Main Jet M5 BVF carburetor Simson
Article no.: MOF-49163/SIZE

Main Jet M5 BVF carburetor Simson

1,40 €
Currently not in stock
Standard Parts
Idle Jet long BVF 16N1 carburetor Simson
Article no.: MOF-49162/SIZE

Idle Jet long BVF 16N1 carburetor Simson

1,20 €
Currently not in stock
Standard Parts
Screw Plug idle jet 16N3 carburetor Simson
Article no.: MOF-41306

Screw Plug idle jet 16N3 carburetor Simson

0,70 €
Currently not in stock
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12

Carburetor Jets: Essential for Optimal Carburetor Tuning

An engine is powerful and reliable only when it maintains a perfect air-fuel ratio across all RPM ranges. To achieve this, you must find the ideal carburetor setting, primarily by adjusting the jets.

Functions of the Jets

Jets regulate the amount of fuel delivered into the carburetor to prepare the mixture with air.

The main jet primarily influences high RPMs when the throttle slide is fully open (wide open throttle). It is the most important jet for engine reliability.

The pilot jet / idle jet, on the other hand, affects the lower RPM range and throttle response at small slide openings.

On PWK-type carburetors, there is also a power jet. This provides a bit more fuel at very high RPMs.

finding The Right Jet

The more an engine is tuned, the sharper its power characteristics become and the more sensitive it is to carburetor settings. Therefore, you must adapt the jet size to the setup and the specific conditions: ambient temperature, altitude, and sometimes even humidity.

To find the appropriate jet after an engine modification, you can use the following indicators:

  • The engine must run cleanly: immediate revving, no stuttering or bogging in the low end, and free revving into high RPMs.
  • The spark plug reading: After a test run under full load (at least 15-20 seconds at wide open throttle), you must remove the spark plug and check the color of the electrode. Ideally, it should be tan / brown.

Signs of a jet that is too large (mixture too rich):

  • The engine struggles to reach high RPMs and stutters at the top end.
  • The spark plug is too dark, black, and oily.

Signs of a jet that is too small (mixture too lean):

  • The engine has misfires in the lower RPM range, then revs up but feels restricted at full throttle.
  • The spark plug is too light, almost white, and very dry.

Pro Tips:

To find the correct jet, you should perform several tests and increase or decrease the jet sizes step by step. A bit of patience is required here. Additionally, ensure absolute cleanliness, as any dirt in the carburetor can lead to a breakdown.

Once you have found the right jets and the carburetor is well-tuned, you should keep an eye on the altitude and ambient temperature. If your engine runs perfectly at 300 meters altitude at 15 degrees, it might not perform the same at 700 meters at 0 degrees or at 10 meters at 35 degrees.

The setting must then be adjusted as follows:

  • Decrease main jet size → when altitude increases or temperature rises.
  • Increase main jet size → when altitude decreases or temperature drops.

Note: Motocross bikes are often supplied with a user manual containing tables that specify which jets to use under which conditions.

Jets in Our Shop

Although we carry a wide variety of individual jet types for all common carburetors on the market (Dell'Orto, Gurtner, Mikuni, Keihin, etc.), we recommend purchasing a jet set with various sizes. This allows you to fine-tune the carburetor setting perfectly step by step. We offer sets from well-known brands such as Polini, MotoForce, or Stage6 with many different sizes.

Naturally, we strive to offer these jets at the best price with the fastest possible delivery times.

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