How to Solve Carburetor Float Problem

It can always occur in our life that you are driving along just fine and suddenly, your exhaust system begins to belch black smoke. When you turn off the engine and look under the hood, you find fuel dripping from the carburetor throat. In practice, this problem may be caused by a stuck carburetor float. Fortunately, you can take steps to get the carburetor working again temporarily, until you can open up the carburetor and fix the float permanently.
If your are on the road, then, you must need a temporary repair to drive your vehicle again.
Open the hood and locate the carburetor body. Tap the top of the carburetor gently but firmly with a small hammer or screwdriver handle. Tap the bowl of the carburetor firmly. This may loosen a stuck float valve, allowing the float to work properly until you can fix the problem permanently.
Remove the drain plug at the bottom of the carburetor bowl with a wrench or a pair of locking pliers if the problem persists. Place a pan under the carburetor to catch the draining fuel. The pressure of the fuel flowing through the carburetor should free the float.
Remove the drain plug in the carburetor throat. Spray carburetor cleaner into the throat and let it drip out of the carburetor bowl drain with the fuel. The carburetor cleaner will dissolve dirt and deposits blocking the float's movement or clogging the float needle.
Replace the drain plugs. If the carburetor was flooded, let the vehicle sit for an hour or two before starting it.
Are you felicitating that you have already solved the problem yet? Actually, you are too early to be cheerful. You just temporarily resolved the problem, and if you do not get further repair, it will occur again sooner or later. So, when driven home, make a permanent repair of your carburetor float.
Turn off the flow of fuel to the carburetor by closing a valve or clamping the line with vise grips. Disconnect the negative battery terminal.
Remove the drain plug on the carburetor bowl and let the fuel drain into a container. Loosen the bolts holding the carburetor bowl to the carburetor body. Remove the bowl, exposing the carburetor float.
Place the point of a pick or very small Phillips screwdriver against the edge of the pin holding the hinges of the carburetor float. Tap the pick or screwdriver gently with a small hammer to push the end of the pin free. Grasp the end of the pin with a pair of pliers and carefully pull it lose from the float's hinges. Remove the float. Check that the needle valve is sitting in the notch on the float. If it's not with the float, retrieve it from the needle seat. Inspect the needle valve for wear and replace it if necessary.
Spray the float, pin and needle valve liberally with carburetor cleaner and scrub them with a toothbrush or lint-free cloth. Clean the valve seat with a cotton swab soaked with carburetor cleaner. Examine the float for holes or other damage and replace it if necessary.
Place the needle valve in the notch on the float and position the float correctly against the carburetor body. Replace the pin that holds the float hinge together and tap it carefully into place with the hammer.
Check the gasket on the carburetor bowl and replace it if necessary. Put the bowl on the motorcycle carburetor body and tighten the bolts that hold it in position. Restart the flow of fuel to the carburetor and check for leaks. Reconnect the battery.

Carburetor Needle Valve Adjustment

 You know, mechanical slide and constant velocity carburetors used on motorcycles use a needle valve to control fuel flow through the main jet. The tapered needle is fastened in the slider portion of the upper carburetor and it slides down into the main fuel tube. And the taper on the needle determines how much fuel can be drawn into the intake stream. The needle position corresponds to throttle setting, all the way into the tube for idle, and sliding most of the way out of the tube for wide-open throttle. Carburetor needles may be adjusted to lean out the main fuel circuit, or make it more rich. In general, raising the needle in the slider will make the air and fuel mixture more rich, while lowering the needle will lean it out.
To adjust carburetor needle valve, you should first get mechanic's tools and needle-nose pliers on hand. Only with good tools, can you do a perfect work.
Then, the first step is to remove the top of the carburetor. Turn the carburetor top mounting bolts counterclockwise until they are removed, then lift the top and slider from the carburetor body.
Next, remove the needle retainer from the slider. Push the needle up into and then out of the slider. Remove the locator clip on the needle with the pliers. And replace the locator clip in a lower slot to raise the needle and make the mixture more rich, or in a higher slot to lower the needle and lean the mixture out.
Then, re-install the needle in the slider and replace the retainer clip. Guide the needle and slider back into the carburetor body, ensuring that the needle slides easily into the main fuel tube. Re-install and tighten the carburetor top cap bolts to factory specifications for your make and model of bike.
Finally, test run the engine. Sneezing and popping back through the carburetor at high RPMs indicates a lean mixture and too low a setting on the needle. While excessive black smoke in the exhaust indicates a rich mixture and too high a needle setting. If these are the situations, you then need to repeat the steps to correct the needle position.
What is more, when adjusting needle valve, you have to always keep warning that the needle is a fairly delicate piece of metal, so you must take care to not bend or change the shape of the needle in any way. www.zjautoparts.net will show you more information.

Components of A Motorcycle Carburetor

Generally speaking, if the engine is considered the heart of a car, then the carburetor is the soul of the engine. The carburetor is responsible for supplying the right mix of vaporized fuel and air to make the engine work. It is a driver's direct link to the internal combustion engine: Push on the gas pedal and it is the carburetor's job to make the car go faster. Conversely, carburetors can be adjusted if a car is not getting enough power.
Basically, a carburetor system works on three basic principles: metering the correct proportion of fuel and air, atomization of the fuel into a vapor, and the distribution of a uniform mixture of both fuel and air into the engine. Then, when fuel reaches the carburetor, it flows through the fuel supply pipe and into a float bowl. Fuel then flows through the fuel jet into the other side of the carburetor. This side includes an air entry point, also known as the barrel or throat at which there is an air filter, a Venturi pipe, a tube which varies in width and the throttle valve.
Well, the term "float system" is used to describe a typical carburetor's operation. Fuel flows through the inlet fitting and through a seat, then pass the end of the needle and into the float bowl. The needle is important because as the bowl fills up, the float pushes the needle into the needle seat, cutting off the fuel. As a result, the fuel stays constant.
The fuel jet is also called the main nozzle. The metering jet, a calibrated opening on the bottom of the float bowl, determines the amount of fuel that will move into the engine. The metering jet opens into a main well which contains air bleeds and baffles that turn the fuel into a vapor as it moves up the main nozzle in a vacuum process, and into the Venturi pipe.
The Venturi pipe is so named because it operates on the Venturi effect. A vacuum is created in the pipe based on how much air is rushing through the carburetor's air entry. The narrow main nozzle moves the fuel into the Venturi pipe by means of low pressure which pulls it out of the nozzle. This spray is then pushed toward the throttle valve.
Commonly, the throttle valve is placed between the spray and the inlet pipe which leads to the engine. There are two types of throttle valves: the butterfly, which is a circular disc and the cylindrical which is as large as the inlet pipe and rotates. The throttle is controlled by the accelerator, with cables or rods attached to the throttle by a lever. Although the accelerator controls the engine speed, variations made to the throttle valve can be made to enhance a car's performance.
At present, there are several different types, configurations, and manufacturers of carburetors available based on what kind of performance is needed. Different configuration variations include two and four barrel types for more airflow, accelerator pumps, high-flow needles and vacuum secondary diaphragms, just to name a few.Get more gas pipe information to http://www.zjautoparts.net/.