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Select Year. Select Make. Select Model. Harley Parts back. Harley Accessories back. Tire Finder. Aspect Ratio. Rim Diameter. Tire Sizes Explained. Tire Width. Harley Tires back.Mikuni Motorcycle Carburetor Theory Motorcycle carburetors look very complex, but with a little theory, you can tune your bike for maximum performance. All carburetors work under the basic principle of atmospheric pressure.
Atmospheric pressure is a powerful force which exerts pressure on everything. It varies slightly but is generally considered to be 15 pounds per square inch PSI. This means that atmospheric pressure is pressing on everything at 15 PSI. By varying the atmospheric pressure inside the engine and carburetor, we can change the pressure and make fuel and air flow.
Atmospheric pressure will force high pressure to low pressure. As the piston on a two stroke engine goes up or goes down on a four stroke enginea low pressure is formed inside the crankcase above the piston on a four stroke. This low pressure also causes a low pressure inside the carburetor.
Since the pressure is higher outside the engine and carburetor, air will rush inside the carburetor and engine until the pressure is equalized.
1. VM28-49 Mikuni 28mm VM Carburetor
The moving air going through the carburetor will pick up fuel and mix with the air. Inside a carburetor is a venturi, fig 1. The venturi is a restriction inside the carburetor that forces air to speed up to get through. A river that suddenly narrows can be used to illustrate what happens inside a carb. The water in the river speeds up as it gets near the narrowed shores and will get faster if the river narrows even more.
The same thing happens inside the carburetor. The air that is speeding up will cause atmospheric pressure to drop inside the carburetor. The faster the air moves, the lower the pressure inside the carburetor. Most motorcycle carburetor circuits are governed by throttle position and not by engine speed. There are five main metering systems inside most motorcycle carburetors.
The pilot circuit has two adjustable parts, fig 2. The pilot air screw and pilot jet. The air screw can be located either near the back side of the carburetor or near the front of the carburetor.
If the screw is located near the back, it regulates how much air enters the circuit. If the screw is turned in, it reduces the amount of air and richens the mixture. If it is turned out, it opens the passage more and allows more air into the circuit which results in a lean mixture.
If the screw is located near the front, it regulated fuel. The mixture will be leaner if it is screwed in and richer if screwed out. If the air screw has to be turned more than 2 turns out for best idling, the next smaller size pilot jet will be needed.
The pilot jet is the part which supplies most of the fuel at low throttle openings. It has a small hole in it which restricts fuel flow though it. The slides come in various sizes and the size is determined by how much is cutaway from the backside of it, fig 3.If you are an international customer who ships to a US address choose "United States delivery" and we will estimate your ship dates accordingly.
If you are an international customer and would like to change the currency that prices are displayed in, you can do so here. Image is a representation of this item. Actual item may vary. Change Currency. Check Fit. Mikuni VM Series Carburetors. Brand: Mikuni. Manufacturer's Part Number: VM Part Type: Powersports Carburetors. Fuel: Gasoline. Choke: Manual.
Carburetor Finish: Natural.
Quantity: Sold individually. Notes: Verify bore size before ordering.
Mikuni VM Series Carburetors VM28-49
Carburetor is a spigot style mount. Mikuni VM series carburetors are the most popular high performance single carburetors in the sport of motorcycling. These time and track-tested carburetors have proven themselves on all terrains and in all conditions. They boast a large selection of bore sizes for an increased fuel mixture flow to match your engine modifications. The Mikuni VM series carburetors also offer you a plethora of tuning components to allow for precise fuel mixture metering for any application.
It's time to go with a winner--install Mikuni VM series carburetors on your bikes and leave the world behind you. I have a Customer Service question order, shipping, returns, etc.Ninja 150 RR Open Kips Tes Setting Karburator Mikuni VM 28
I would like to ask other customers a question about this Product. Thank you for your question. The inlet diameter of the Mikuni VM carburetor measures 44mm and the engine side measures 35mm. Summit Racing Answer - September 18, Answer This Question. The carbs from Summit. I then drilled the port holes myself, easy to do.
Summit Racing Verified Purchase. Was this review helpful? Yes No. If you feel that this review is inappropriate and should be removed from the site, report it to us by clicking the "Report Abuse" button below. Date: May 09, Low Price Guarantee.More than just extraordinary food, Mikuni is about the overall experience. From the moment you walk in the door until the moment you push back from the table or sushi bar—contented beyond measure—you are caught up in an atmosphere that is as unique as it is stimulating.
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Mikuni Carb Identification: How to tell which one you have
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International Customer Options. Delivery Options If you are an international customer who ships to a US address choose "United States delivery" and we will estimate your ship dates accordingly. International delivery. United States delivery. Mikuni Mikuni manufactures high performance carburetors and tuning components for street and drag racing motorcycles.
SinceMikuni has been making parts designed to give you precise fuel mixture metering while still delivering smooth throttle response. Summit Racing carries a variety of Mikuni parts, including Mikuni carburetors and Mikuni carb parts, like Mikuni jets, pocket tuners, rebuild kits, valve and seat assemblies, vacuum fuel pumps, float bowl screws, and more for Suzuki, Kawasaki, and Yamaha.
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General : Mikuni's VM Series, round slide carburetors have proven themselves as the performance standard for use on single and multi-cylinder, motorcycle and ATV vehicles. They're perfect carbs for street riding, motocross, enduro and trail riding, as well as flat track and road racing. These carbs are designed to work on both 2-stroke and 4-stroke engines.
VM series carburetors offer a large selection of bore sizes for optimal fuel mixture and flow to match most engine modifications. A wide range of tuning components are available to allow precise fuel mixture metering in almost any application, at any throttle setting and under any riding condition. I am not sure where you can find something like that. I imagine it would be easier to use a spacer on the carb side to bring the OD up to 40mm, and then use a straight piece of green stripe radiator hose or similar.
Some consider primary style needle jets as 2-stroke specific, but they are often successfully used with 4-strokes as well. The series is a primary style needle jet.
Bleed style on the other hand should be used with 4-strokes only for the most part. Access for the choke also will always be on the left side. Most bikes with dual carburetors can be started using just one carb especially two strokes. Even with the choke on the inside, the choke lever can usually still be accessed.
Unless you engineer one, there will be no interconnection between the carbs. I have a DT and I can tell you from experience that the carbs close, but not the same. Some of the jetting components are interchangeable. That being said, may people have used the VM round slide. I am not sure if the size of the engine-side spigot and intake bell are the same. We have those dimensions on our listings and you can compare them to your stock carb.
Some of the earlier DT's had oil injection ports in the carb. I don't thank that is the case with the model. If you have the original jetting and component sizes throttle slide, jet needle we can probably come very close to matching them. We have done this with other SS carbs on Yamahas see link below. I have posted a few links that may help you. If you have any other questions, please contact me at rick nichecycle.
We don't carry any pre-jetted carbs or kits specifically for the Ural.