The jet needle is connected to the throttle valve and controls the mixture from approximately ¼ – ¾ throttle. Replacing the existing slow jet with a higher-numbered jet will make the mixture richer, while a lower-numbered jet will make the mixture leaner. The slow jet is interchangeable with jets that will provide a leaner or richer air-fuel mixture. Turning the pilot air screw in will richen the air/fuel mixture while turning the screw out will lean out the mix. The atomized air/fuel mixture then passes into the throat of the carburetor. The slow jet draws fuel from the bowl and mixes it with air from the pilot air jet passage. This system controls the air-fuel ratio from closed throttle to ¼ throttle. The slow jet works with the pilot air screw. They come in many shapes, but their function is the same.Ģ-Stroke Carburetor Jetting Structure Slow Jet 2-Stroke Carb Adjustment – Slow Jet You will almost always find a slide style throttle valve on 2-stroke carburetors.
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Parts of the Carburetor and What They Do Carburetor Body
#DUCAR GENERATOR ENGINE HOW TO#
Knowing how to change your jets and needles is one thing, but it won’t do you any good if you don’t understand how the changes will affect your dirt bike. Although some may have different configurations or features, they all do the same thing – mix fuel and air. Once you understand the basic functionality of one 2-stroke carburetor, you can apply that understanding to ANY carburetor.Īlmost all 2-stroke carbs operate the same way. This 2-stroke carb tuning guide will give you all the information you need to tune your 2-stroke carburetor for peak performance, no matter the make or model. Tuning Your 2-Stroke Carburetor For Peak Performance.Why Proper Carb Tuning Is Critical For 2-Stroke Engines.Parts of the Carburetor and What They Do.