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.
Throttle Valve – The throttle valve is directly connected to the throttle cable and regulates the flow of air through the carburetor. Getting that idle just right can be tricky sometimes. This is where you will spend a lot of time during 2-stroke carb tuning. Pilot Air Screw – Controls idle speed by regulating the amount of air passing through the pilot jet passage. Float Valve – The float valve regulates the flow of fuel from the fuel tank to the carburetor bowl. No 2-stroke carb adjustments will work if the bowl is always flooding. The floats are made of hollow plastic or metal connected to the carburetor body by a hinge. Float Assembly – The float assembly sits inside the bowl to regulate the fuel level in the carburetor bowl. The bowl also houses the float assembly.Ģ-Stroke Carb Body And Bowl Internal Carburetor Components 
Bowl – The carburetor bowl is located on the bottom of the carb and holds the fuel to be sent through the jets. Body – The carburetor body houses all the moving parts and jets, and mixes the air and fuel on its way to the cylinder. Parts of the Carburetor and What They Do Carburetor Body Ducar engine parts 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. At VMC Chinese Parts, our objective is to get you the right part, the first time, with thorough measurements and multiple images. In the event, however, that there is still uncertainty about a part's application, we encourage you to contact us, and be prepared to provide pictures and dimensions of the part in question. For those reasons, shopping for parts for a Chinese-built machine is largely a visual exercise: rather than ordering parts by make, model and production date, the best way to ensure that the part ordered is correct is to match the specifications of the parts. Secondly, there is a bit of an "as is" attitude towards Chinese-built machines there simply aren't model specific parts catalogs available. Because Chinese machines are assembled with parts from a variety of manufacturers for the same application, even in the same model and model year, cross-referencing numbers stamped on the original part is usually not possible. First, most Chinese machines are assembled with aftermarket parts there are no OEM parts. Shopping for Chinese ATV Parts or Chinese Scooter Parts is a bit different than shopping for parts for a domestic or Japanese machine, for a couple of reasons.
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