For the combustion chamber to work on an ATV, it needs air, gas, and a spark. As long as you take a close look at the mechanics behind this issue with your ATV, then you should be able to figure out why your ATV is sputtering and then fix it.
One of the most common reasons ATVs sputter has to do with carburetor problems. Some ATVs have carburetors, and some have fuel injectors. If you have a fuel injector, you can skip this section. If you have the right set of tools, then diagnosing the problem and making the repairs should be relatively easy. If your carburetor has a gas leak, it was probably caused by a gasket that became brittle or cracked.
The gasket you want to look at is located right above the float bowl, which is at the bottom of your carburetor. You may need to replace your float bowl gasket if you notice that your ATV is sputtering because of a gas leak. If your ATV has more than one carburetor, you should change each float bowl gasket you have.
Chances are if you need to replace one, then all of your float bowl gaskets are probably worn out and failing or close to failing. Diagnosing should be pretty easy as you should notice the smell of gas if your ATV is leaking gas, you may even visually see the gas leaking.
Do a complete visual inspection of your ATV as well so that you can assess where the leaks are coming from. Another reason why your ATV might be sputtering is that your carburetor needs tuning.
If you discover you need to retune your carburetor, then we suggest you take it into a shop and have your ATV tuned there. Just for grins, I told him to start with the coil, as it was the cheaper of the two should he desire to return the CDI. Turns out I was right Ok, so far this is where I'm at.
Changed plug, Cleaned carb, check everything in carb, all is well. Flushed fuel out and replaced with new. I had an extra cdi box laying around, tried it, didn't help. I did a compression test today and it only came up to 75psi. I know the book calls for psi, but I'm not sure how low is too low and if what I'm describing could come from low compression. I tore it down to check the valve clearances, but the motor hasn't cooled yet to check them. Here's another thing to note: I was toying around today and pulled my air filter off, I learned a trick a few years ago where if there is something clogged in the carb, sometimes you can put your hand over the intake and pull it off real quick and sometimes get lucky!
Well, when I pulled the filter off, it ran better. I could rev it and it didn't seem like it was cutting out. As soon as I would put the filter back on, it ran terrible again. The plug I pulled out was really, really rich looking too.
So, any ideas??? A quad will spit and sputer when it is running rich. Ok I have seen this b4 on my friends KFX, so I am not sure if this will apply the same with your r. Chack to see if you are on reserve on the gas tank. For pit bikes with smaller cc displacement engines, in order for a cylinder to fire efficiently, three separate components must work together; the fuel delivery system carburetor , the ignition coil and wires and the spark plug.
Typically with most pit bikes, the problem is going to be with the spark plug or the carburetor; with the fuel system being the primary culprit. The first step we recommend is to check the efficiency of the spark plug. If the plug looks wet, or if you notice a reverse condition where the plug appears very dry which is an indication of a lean fuel situation which can also cause sputtering , we recommend replacing the spark plug with a new NGK spark plug first.
The next thing that you want to check and clean the carburetor. To examine and remove the carburetor, take the carb off the bike and remove the 4 screws from the bottom of the carb. At this point, you'll see two gold screws.
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