![]() Any time you tip your dirt bike over, a little bit of gas will leak out the overflow, so that is nothing to worry about. Fuel Coming Out OverflowĮvery carburetor is supposed to have overflow hoses so that if too much fuel is going into the carb it will come out of these hoses instead of flooding the engine. Gaskets are cheap, but you may be stuck waiting for a new one to arrive if your local shop doesn’t have them in stock. If it still leaks, replace it with a new one. If this is torn, cracked, or out of position, gas will seep out.įirst, make sure you have it properly aligned when installing it. The float bowl has a paper gasket or a rubber o-ring that seals the bowl to the carb body. Below are the 5 different ways your carburetor could be leaking gas. ![]() Rubber and paper parts dry up and crack/tear if they haven’t been used for a number of months or years. Parts age and wear out or harden as time moves on. Last, but certainly not least, are the leaks that come from the carburetor on your dirt bike. Of course, if you don’t have the fuel line on all the way with proper hose clamps it can vibrate its way off the valve or carb spigot. This is why you need to figure out why your dirt bike is leaking gas right after you start smelling it on the outside of the bike. It may start as a very slow leak, but it will soon turn into a major problem. This will lead to a rip or tear in the gas line that has simply deteriorated. The material does not last forever, so after a number of years the rubber will harden and start to crack. The fuel line is a simple piece of fuel-resistant rubber tubing that connects the fuel valve to the carb or fuel injection system. Just keep working up the chain of parts until you find the root of the problem. Just because the bottom of the carb is dripping gas doesn’t mean that the carburetor itself is leaking. Wait and see if you can spot where the wetness is starting from. You have to start with a clean and dry bike, then turn the valve on to the open position. Petcock/Fuel ShutoffĪ leaking fuel valve, commonly known as the “petcock” on dirt bikes is not always easy to spot. Going too rich will cause other side effects, such as running poorly and bogging. More gas in the mixture will help bring the engine temperature down. To fix this, it will need some jet-tuning to get the air-fuel mixture right. It’s easy to tape on to the underside of your gas tank.Īn engine that runs hot may be running too lean. If this is a consistent problem, you should get your engine running cooler Tank WrapĪn easy way to keep the gas tank cooler is to use a thermo-heat barrier (Amazon). What can you do to help prevent your gas from boiling over? There’s a few different ways to keep the gas cooler. If the engine gets too hot for too long then it will start to cook the gas in the tank. The engine is right below the gas tank on most dirt bikes, so where does the engine heat go? That’s right, the gas tank automatically heats up once the engine is warm. This is caused by the engine getting so hot. Have you ridden your bike really hard on a hot day? Gas can actually bubble up and boil over if it gets too hot. If you see gas leaking out the tank overflow when it shouldn’t be, try adding a little less gas in the tank next time you fill up. Either from bouncing or tipping over, you may see gas coming out the overflow tube. Isn’t it nice to top off your gas tank and be confident that you can ride for hours before needing to re-fill? Well, that confidence may turn into some gas spilling out the overflow. All it takes is a little pinhole for gas to start coming out. Holes can also happen from an unusual erosion or corrosion. Holes can from an impact such as a tree branch or a sharp rock. Leaky HolesĪlthough not very common and usually easy to spot, holes can cause major gas leaks on a dirt bike. Most dirt bike gas tanks are made out of plastic that is very thick and durable, but there’s more than one way that they can leak gas out of them.
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