how to know if a motorcycle carburetor no longer works
Carburetor malfunction can be quite frustrating. In my experience, when a motorcycle starts running, I first check the carburetor because that’s usually the culprit. Sometimes it can be difficult to tell if it is the carburetor that is causing the problem or not. I have listed 9 common symptoms of a faulty motorcycle carburetor that you can check to see if it really is the reason why your motorcycle is malfunctioning.
how the carburetor of a motorcycle works
The main function of a carburetor on a motorcycle is to mix the proper amount of air and fuel that the engine needs to function properly. When a motorcycle runs lean, that means there is too much air and not enough fuel in the air / fuel mixture during the combustion process. This process takes place at the carburetor if your motorcycle has one.
A lean running motorcycle will be known for slow performance, exhaust pipes running hotter than normal which can turn blue, and if the spark plugs wear out faster than normal. This is because the excess air makes the mixture burn much hotter than it should.
A poorly running motorcycle engine is usually caused by clogged jets inside the carburetor. When the jets are clogged, that means not enough fuel is being delivered, so there is too much air in the mixture. It could also be as simple as turning the carburetor idle screw to adjust the fuel / air mixture. For more information on how your motorcycle runs tight, check out my other article here.
Running rich: a lot of air in the motorcycle carburetor
Sometimes a motorcycle that runs rich is seen as the opposite of a motorcycle that runs poor. Running rich means that there is too much fuel in the air / fuel ratio inside the carburetor and in turn will cause the motorcycle to run poorly. When too much fuel is added and there is not enough air, you will likely notice that your motorcycle smells strongly of fuel, you will notice a fuel leak (probably from the carburetor), and poor overall motorcycle performance. Some motorcycles naturally smell like fuel, but if you notice an excessive amount of this smell, you are probably getting rich.
Fortunately, there are several ways to fix a motorcycle in full swing. Such ways can include adjusting the air / fuel screw, fixing a punctured needle, fixing stuck open floats, and fixing stuck butterfly valves. (all that are part of the carburetor). Click here to see my other article for more details on how to fix a good running motorcycle.
carburetor with larger fuel input
While some motorcycle owners purposely fuel their motorcycles, it is not something that should be happening normally. There are several reasons why a motorcycle can unintentionally get more gasoline , but two of the main reasons will include too much fuel or too little fuel being delivered (lean or rich) from the carburetor . If there is too much fuel present, the combustion process may not be able to burn all of the fuel, pushing some of it into the exhaust pipes. Then the fuel will burn due to the extreme temperatures in the pipes, giving it a loud pop sound.
With too little fuel there is too much air and fuel has a hard time burning. As soon as the exhaust valve opens and the air / fuel mixture hits the hot exhaust header, the fuel ignites and makes a loud sound. For more information on the reasons why your motorcycle is failing, check out my other article here.
Sputtering: how a motorcycle carburetor works
If you have a motorcycle that sputters, the carburetor is probably the culprit. There are three main reasons including a vacuum leak, a fuel leak, and being out of tune. A carburetor vacuum leak can cause the motorcycle to sputter because it causes a disruption in the proper air-to-fuel ratio mixture, resulting in poor motorcycle performance. Vacuum leaks are usually caused by intake boots that are cracked or brittle. A fuel leak from the carburetor will also upset the air / fuel ratio because it goes elsewhere.
Splashes can also …