Question: Are all carburetor jets the same?

Are all carburetor jets the same? Different carbs take different style and sized jets. Theres not 1 style jet for every keihn carb.

Are carburetor jets universal?

Yes you can. As long as they are the same style of Keihin jets.

How do I know what size carb jet I have?

Jets are threaded and have a small orifice through their center that varies based on the size of the jet. For example, a jet may be stamped (on its head) with the number 30. This indicates that the jet’s size is 30 mm.

Are all Keihin carb jets the same?

No they aren’t all the same they have a few different ones. My ktm dealer had all different kinds for keihin carbs. I’d say they should have what you need.

Are Mikuni and Keihin Jets the same?

Steve_C. The Keihin 6mm round series is the same as the small Mikuni ones fitted to the S model. The diameter of the Keihin thread is the same but the pitch of the thread is *fractionally* different – it is not a problem.

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What do Jets do in a carburetor?

Carburetors contain tiny nozzles—these are the “jets”—that have holes. Fuel passes through these holes to mix with air. This creates mist, which then travels to the combustion chamber, where it’s used as energy to run your engine.

What happens if main jet is too big?

For example, using too large of a main jet will cause more fuel to enter the combustion chamber than it can efficiently burn. This will result in a “sputter” at full throttle. It could best be described as a rapid misfire.

What happens if main jet is too small?

Be careful: most engine jams occur when the main jet is too small. A lean fuel/air mixture will cause the engine to overheat fast.

How many jet sizes go down?

1 number for each jet size change. So it would take a 5 jet jump to get about a 0.5 ratio change. Much bigger carb, intake, heads, cam etc. It’s actually possible to need LESS jet when you change to a much better exhaust system.

How do I identify my Keihin carburetor?

Look at the carburetor itself. You will find a number that is usually preceded by two to three letters. This is your model number. This number is needed for all parts orders or repair assistance.

What size is a 38 jet?

A # 38 Jet is 0.38 mm in diameter.

How are Keihin Jets measured?

Keihin jets are measured by the orfice size. A 180 jet is 1.80mm in diameter. The Dynojet main jet hole size is measured in millimeters. For example, a DJ142 has a 1.42mm hole.

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What do Mikuni jet sizes mean?

Mikuni hex head jets are numbered by bulk flow, while Mikuni round head jets and Keihn jets are numbered by inner diameter in mm. The flow difference between a Mikuni 175 hex jet and a 180 is about 6cc ~3%) . Keihn jets are numbered by jet id, and the difference between a 178 and a 180 is about .

How do you measure a pilot jet?

How do you tell if your pilot jet is too lean, rich, or just right? The pilot jet is sized correctly if the fuel screw setting falls between 2.5-3 turns out. The pilot jet is sized correctly if the air screw setting falls between 1-2 turns out, with 1.5 being the sweet spot.

Where can I buy Mikuni Jets?

Buy Mikuni Jets @ PJMotorsports.com.

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