Often asked: What Jet Goes In My Carburetor?

How do I know what jets to put in my carb?

The old jets will have a number on the side of them to tell you how large the hole for the gas is. If you’re trying to give your engine more gas, install jets with a larger number which means it has a bigger hole. To make your engine run leaner, install jets with a smaller number and therefore with smaller holes.

What size main jet should I use?

A larger jet number means a bigger hole and more fuel. A smaller jet number has smaller holes and should be used if your engine needs to run more lean. Whether your machine is running too lean or too rich is a good starting point for choosing your jets, but using a jet calculator minimizes trial and error later.

What are the Jets called in a carburetor?

On the bottom for the carburetor you typically have two jets. The pilot, the smaller of the two, and the main jet. Let’s start with the pilot. The pilot jet handles the mixture from idle to 15 to 20 percent throttle.

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How many jets does a carburetor have?

The carburetor consists of four components: Pilot Jet – this controls the amount of fuel when idling. Main Jet – this controls the fuel when you open up the throttle (between 50 and 100 percent power) Jet Needle – this controls the fuel when you open and close the throttle (between 20 and 80 percent power)

How do you tell if a carburetor is rich or lean?

Typical symptoms of a rich mixture are:

  1. Poor fuel economy.
  2. Sluggish acceleration.
  3. Choke not needed from cold starts.
  4. Sooty or black spark plugs.
  5. Sooty or black muffler end pipes.
  6. Strong smell of gasoline when the machine is at idle.
  7. Uneven running (will often slow from regular idle rpms and then stop)

How do you adjust the main jet on a carburetor?

Carb Quick Guide

  1. Verify carburetor is set to stock settings:
  2. Start bike, bring to operating temperature.
  3. Set idle speed adjusting screw, clockwise to increase rpm, counter-clockwise to decrease rpm.
  4. Adjust idle mixture by turning idle mixture screw slowly clockwise until the engine runs poorly.

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.

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What happens if main jet size is smaller?

Installing a smaller size jet will reduce fuel flow, which is ideal for high-altitude conditions where air is limited, where a larger jet size increases fuel flow for oxygen-rich, low altitudes.

Can you drill out carb jets?

By drilling out your stock main jet to larger sizes you will be able to narrow down what jet size your carburetor needs. You will need a numbered drill bit set. If it’s lean and you need to increase the size of your main jet, drill the jet out with the next size larger drill bit, which in this case is the #60 bit.

How do you clean carburetor jets without taking them apart?

To clean a motorcycle carburetor without removing it, you’ll need to remove the bowls at the bottom of the carburetor. Once the bowls are removed, spray some carburetor cleaner up inside, wait a few minutes, then spray again to ensure coverage. Then replace the bowls and start the motorcycle to assess how it runs.

Are all carb jets the same?

Yeah, most Keihin jets are interchangeable and most Mikuni jets are interchangeable (though the two brands are not interchangeable with eachother). Any motorcycle dealer should be able to get jets for your bike even if they do not sell the brand of bike you have.

Why are carburetors not used anymore?

Most car manufacturers stopped using carburetors in the late 1980’s because newer technology was coming out, such as the fuel injector, that proved to be more efficient. There were only a few cars that continued to have carburetors, such as the Subaru Justy, until about the early 1990’s.

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Why does my carb have 3 jets?

Smaller carbs only have 2 jets. Bigger ones have 3. As the air passes through the venturi, the different jets are required to vaporize either more or less amounts of fuel.

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