170,361 views Jun 6, 2018 If your carburetor is leaking gas from the overflow tube, then this video will tell you how to solve that issue and what is causing that to happen!! Just take the old line off and go to your local automotive store and ask them to cut you a new piece of the same inner diameter and length of the fuel line that you just removed. This is for easy swapping of the jets. In this case, if the fuel valve is leaking, I recommend just rebuilding the entire thing instead of trying to diagnose which of the pieces of rubber is causing the leak. Most of the time, if gas is leaking through the overflow tube, then your carburetors float is probably stuck open. If gas is pouring out of the carb overflow, then the most likely culprit is the float valve is either stuck open or has some debris preventing it from closing. If you have a dirt bike leak gas and you ignore the problem you are wasting money and polluting! Fortunately, it is usually very easy to fix a dirt bike leaking gas! A common problem with older dirt bikes is gas leaking unexpectedly. These leaks are generally slower than a float valve leak, and thus a little harder to spot. For me, this starts with turning the fuel off and drying everything off with a shop rag. The same principal applies, these bolt heads are going to have a gasket that might be leaking. The most common places a motorcycle leaks gas are the fuel petcock, the carburetor, holes in the gas tank, and the fuel injector. If you had to completely drain the fuel out of the system, dont be discouraged if the first startup takes a few kicks because the fuel will need to work its way down from the gas tank and fill up the float bowl before you have any shot at the engine running. Your carb will have a float in the bowl that rises with the level of gas in the float bowl. It is not normal for the carb to spit anything out the overflow , unless the float valve is not functioning correctly or the float is incorrectly set . At the bottom of most carbs there is a drain screw in the float bowl. Never use E85 (aka FlexFuel) in a carbureted motorcycle. E85 pump fuel contains 85% + Ethanol and will begin to damage parts in the carburetor that were never designed for this type of fuel. These manifest themselves in wet float bowls, with no obvious sign of leaking. Now lets take a look at some of the common problems and fixes for a leaky dirt bike. Here are the most common (in 80% of cases) Motorcycle Carburetor Flooding Causes at a glance: Incorrect Servicing Faulty Air Filter Faulty fuel delivery to the carburetor Engine oil overfilled Motorcycle Tip Over or Crash Misfire From Cylinder or Air Filter Suppose there's any possible damage from overfilling a carburetor. To find the location of the air leak, get a can of WD-40 or carb cleaner that has an extension nozzle on it and briefly spray on small sections of the carburetor while the motorcycle is on. A quick way to fix a stuck float is just to gently tap the carburetor bowl with a rubber mallet or something similar to shake the contaminants and free the needle valve. Make sure that the connections are sound and have hose clamps on them. Dirtbikegearguide.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. These are all easily accessible from the outside and require no major engine work. This will generally be a rectangular-ish gasket roughly the size of a business card. If all else fails, make sure to check the fuel line that goes from the carb to the fuel valve. If you notice the motorcycle idle improving after a certain spray on the carburetor, you've found the location of the leak. On most dirt bikes, there is a fuel shutoff value next to the gas tank. The first step in fixing this problem is to identify the source of the leak. If you follow your fuel feed hose back to the gas tank you will find it. The particular. Most carb rebuild kits come with one, but you might be lucky enough to just find the gasket for the float bowl for your carb if you look. The last time I had to do this, I think it cost me a total of 2 dollars including tax. These fuel values are in place to allow you to turn the fuel off during storage and transportation, turn it on during riding, and some even have a RES setting which stands for reserve which gives you a little more gas to get back to the truck. Carburetors may now be considered 'old school' but they have been doing their job for a very, very long time. With the ethanol in most gas these days, fuel lines arent lasting as long as they used to. If the fuel line is old and brittle, just replace it. Rebuild kits are easily purchased online and come with everything you need. We always recommend replacing the float needle valve every 2-3 years or immediately following any prolonged storage where a fuel stabilizer was not used. If for some reason this plunger is not allowed to seat in the float valve then gas will continue to come into the carb, overflowing the float bowl and running out the overflow. Ever get ready to ride only to find out that you are just pouring gas onto the ground? Remove the float bowl and take a look at the gasket between in the float bowl and the carb body. Another quick trick is to try tapping on the carb bowl with the handle of a screwdriver to see if that knocks whatever is preventing the valve from closing loose. Next, I will squat down next to the bike and turn the fuel back on. Replacing the fuel line is a quick, cheap, and easy fix. If the fuel valve goes bad, it most likely needs to be rebuilt. The first step in fixing this problem is to identify the source of the leak. If there is a drastic leak, the source will be very obvious as fuel will spill out of one area quickly. The common places that a dirt bike will leak gas is out of the fuel switch, the carburetor overflow, the fuel bowl, or the carburetor drain screw. Gas leaking out of the dirt bike is a symptom of a bad seal or gasket. This is used for draining the excess fuel out of the bike when you put it up for long storage. You only need low pressure fuel line for carbureted bikes which is about 5 times cheaper than high pressure line. Fixing it is pretty easy and involves taking the carb off your dirt bike, removing the float bowl (typically held in by 4 screws), and either cleaning or replacing the valve. Why Does My Dirt Bike Only Run on Choke?Dirt Bike ToolsBuying a Used Dirt Bike. Again, most carb repair kits are going to come with a replacement drain screw, but you might be lucky enough to find just the screw. The common places that a dirt bike will leak gas is out of the fuel switch, the carburetor overflow, the fuel bowl, or the carburetor drain screw. Gas leaking out of the dirt bike is a symptom of a bad seal or gasket. Go ahead and replace the carb bowl and tighten the screws to spec. Any time you have gas on the outside of the bike (anywhere but the fuel lines and carb) then you have a problem that you need to address. This float is connected to a plunger which prevents additional fuel from entering the float bowl. The fix is to either replace the screw itself, or to replace the gasket that is between the screw and the float bowl. If it is a slower leak, you may need to wait until you see gas drops coming out of the overflow, or on the bottom of the carb. To fix this, you will need to take the carb off the bike (or at the very least rotate it in place by 90 degrees to give yourself access to the float bowl screws. If the gasket looks crumbly, or a little worse for the wear go ahead and replace it. Why does my dirt bike leak gas? Now that your bike is no longer leaking gas, it is time to get it fired up and start riding. Generally it is just a bad seal or gasket that is causing the leak. Meaning that despite them been replaced by fuel. Sometimes these screws have a tendency to leak. You could try polishing the valve seat with q tips and Brasso or the like until it's shiny clean . Gas can leak from a motorcycle anywhere in between the motorcycle gas tank to the carburetor or fuel injector usually because a hose isn't on tight, a gasket is worn, or a nut isn't tight enough. Of note is that on some carbs, the drain screw doesnt exist but rather has a large bolt head in its place. 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