Motorcycle Crankcase Full Of Gas

The thing would start easily and run but puked fuel out of the engine breather in a continuous stream and when I removed the oil fill the dmn thing erupted gas like a fountain--the crankcase was literally full of fuel. High revving on idleabout 3000 revs.

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This situation is called gas washing the engine.

Motorcycle crankcase full of gas. Thats because as the full level falls the amount of pressure head it creates falls too. It should flow out of the bowl from the over flow tube but even if the over flow tube is working as it should there maybe more fuel flowing by the float needle than the tube can get rid of. They are in the crankcase under the y-pipe.

As fuel over fill the fuel bowl the gas must go some where. Thats usually the first sign of a bad needle and seat when it floods the engine crankcase full of gas. Take the gas cap off and tear the check valve off the bottem of gas cap.

Checked my oil last night and noticed that the crankcase was completely full and the oil smelled strongly of fuel. Here is the worrying part there is smoke coming from the rocker cover area. The exhaust also smells more strongly of gas than usual its been like that since day one.

You should also check for gas in the float. When you installed its new pistons did you gap the rings. Has the vehicle turned into a gas hog.

If water sits too long in your carbs it will turn to a white scale which will clog fuel passage ways. The new oil is in. If you really have fuel in there youve thinned the oil out and could conceivably start toasting things like bearings and camshafts.

A litre of fuel getting into the crankcase in five minutes of running sounds more like it could be a problem in the bore. Ya it always sucks doing thing twice before. Hence the need for using filters and changing oil.

And how does it start -- same as usual. If you give it a little gas it idles and runs fine if you do not kill it when you put it in gear. At first I thought maybe it was because I left the gas on but then I remembered that the only way gas will flow from the petcock is if it has vacuum from the engine.

We drained the oil to find out that the crankcase was full of gas. But as you run down your tank the motor starts running leaner and leaner until you fill up again. It drips out the dipstick.

Since the bike had been sitting for a week there was no way it could have had any vacuum pressure. An indication of the pump being bad is fuel. When it sits heat builds presure in gas tank and fources it past carb and leaks past ringscheck valve is for rollover you really dont need it i had 2 atvs 1 filled crank case other filled breather box.

If the crankcase filled up while cranking or running the fuel pump can be the problem. As stated above its an injector leaking if you truely are getting gas in the oil. Starts easily but will not idle.

Thank you for choosing Just Answer. Crankcase is full of gas and oil in my quadrunner. Best thing to clean it with is limeaway.

If a leaking gas valve or carb float needle cause gasoline to fill the engine crankcase and you attempt to run the bike the fuel is then pumped through the system washing oil from vital areas such as bearings. Ect but the bike is running now. To check lift the tank and put 23 feet of fuel line on the petcock leading into a container.

The motor might run fine with a full tank because the amount of fuel above is sufficient that the pressure overcomes the lack of volume. That crankcase vent shot a stream of gasoil about 10 feet. Remove it at the crankcase.

Yes it could fill the crank case. Also change the oil. We just finished the mods today and took it for a quick ride- 10min- and when he got back we noticed that the crankcase was completely full.

The only way fuel can get into the crankcase is by overflowing the carb into the intake manifold through the heads past the rings into the crankcase. You may have forgotten to turn the fuel off when you. -remove the line from the fuel pump to the crankcase.

Posted on Sep 14 2009. If thats the case you will have to drain the fuel tank and let it dry out and drain all the fuel bowls out. While the float is removed shake it listen for gas sloshing around inside it.

I though it was steam but it is smoke. A leaking gas valve can do more than just waste gasoline. Install the fuel bowl and nut.

I cant quite identify where it is coming from. The next day you look at the bottle with the fuel pump linesee fuelthe pump is your issue. Friend just picked up an 86 CH150D for cheap.

We filled the oil back up and I took the carb apart to inspect the needle and seat. Then it flows into the reed box and in the crank case. Drained the crankcase refilled with oil and started checking the fuel system.

This will tell you if the seat will hold gas or not. Because it kinda seams like it is coming from the exhaust but then again seams like its coming from the. Guy before me ran it on full choke all the time and the carbs leaked externally so after I took them apart cleaned replaced gaskets etc.

Fuel in the crankcase. If you got a crankcase full of gasoline without the engine just sitting you have a bad vacuum fuel cut off and at least float valve that didnt work. If the seat can hold 5 PSI then it is ok.

Leave the gas shutoff ON and put the line into a bottle overnight. Change oil and filter. If you see fuel in there after a few hours you need to rebuild the petcock.

At this time make sure the crankcase drain plugs are in. Its not an uncommon problem on two strokes the older bike did it alot. If its not seating properly it will leak down slowly untill the pressure in the fuel system lowers enough that the injector does reach a point where it.

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