How to Adjust the Throttle Needle on a Moped
Just about every moped uses a carburetor. It uses a network of needles and floats that give a specific amount of access to the fuel and oxygen that powers the engine. Making sure these are adjusted properly will help keep your moped's performance at its best. The throttle needle, also known as the jet needle, can be adjusted to run your moped's fuel mixture leaner or richer.
Instructions
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1
Turn the flow of fuel from the fuel tank to "off" position. Use the screwdriver to remove the screws that hold the carburetor in place. Pull the carburetor off of the hose connected to the air intake.
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2
Unscrew the cap that is attached to the fuel line on the top of the carburetor. Under the cap is a spring called the slide spring that keeps the jet needle in place.
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3
Pull the slide spring out of the carburetor. Inside you will see the jet needle resting in what is called the throttle slide.
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4
Remove the jet needle and the clip attached to the needle called the "E" clip. Five notches can be found on the top of the needle. This is how you will adjust the fuel mixture amount that enters the carburetor.
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5
Choose if you want to run your moped leaner or richer and then take the "E" clip and put in on the appropriated notch. The third notch is generally the stock position and doesn't necessarily mean that it is right for your moped. Placing the "E" clip higher on the needle will run it leaner, and lower will run it richer.
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6
Reassemble the slide and needle the way they came out. Sometimes it is easier to use needle-nose pliers to hold the slide spring in place to do this.
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Tips & Warnings
Altitude and the air temperature will have an effect on whether you will want to adjust for lean or rich.
When doing anything with your moped engine and carburetor you should make sure the engine is cool so you don't burn yourself.
References
Resources
- Photo Credit harley davidson - moteur image by dead_account from Fotolia.com
