How do you jet a carb on a motorcycle?

How do you jet a carb on a motorcycle?

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What does putting bigger jets in a carburetor do?

Bigger carburetor jets allow more fuel to enter the carburetor from the fuel tank. Usually, installing bigger jets alone is enough. Installing a bigger carburetor altogether is only done for major modifications, where you have significantly improved your bike’s air intake and fuel injection.

How do I know what size jet carb I need?

When the operating altitude of the engine will be 2000 feet higher than your normal altitude, you’ll need to insert a jet one or two sizes smaller than the size currently installed in the carb, which reduces the amount of fuel entering the engine to match the reduced level of oxygen in the air.

What does a pilot jet do in a carburetor?

The pilot jet handles the mixture from idle to 15 to 20 percent throttle. Air comes in through the front of the carburetor drawing fuel up through the pilot with a vacuum that is created as the air flows through the pilot circuit.

Where is main jet on carburetor?

The main jet is located at the bottom of the carburetor inside the float bowl. It’s the larger of the two jets, and it is installed in the needle jet—that part we will be covering next week.

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 do I choose a jet size?

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.

How do I tune my main jet?

How-To tune a main jet

1. Step 1 – Warm up the bike to operating temperature.
2. Step 2 – Install a brand new spark plug(s).
3. Step 3 – Perform a wide open throttle (WOT) plug chop.
4. Step 4 – Read the plug.
5. Step 5 – Determine if you are lean or rich based off plug color.
6. Step 6 – Repeat all steps.