YOMAHOMIE03

Well, I posted this before to get some ideas about my wife's gas leak problem. We went a 2 week vacation, came home to start it up and let her ride, and it started up and starting leaking gas and died immediately. Then it wouldn't start unless we let it sit for a bit and it would start,leak gas and die every time we get it to start.Plus the leak is a good amount also. The leak is coming the clear hose attached to the air box. Someone said that I need to clean the carbs but I'm not sure why that much gas would be coming out of the air box. I actually have the time to sit down and look at it this weekend so any advice would be helpful. Thanks.

Wrider

Seems that the float valve is probably clogged up. When the 250 is started, it creates a vacuum from the carbs that opens up the petcock. That allows fuel to flow through the petcock and into the carbs. The float valves in there are a fuel check system, they don't allow in too much, and meter the fuel into the float bowls. If there is something in there, it can cause it to jam open and pour too much fuel into the bowls, which will overflow and kill the motor as well as pour into the airbox (even if it's uphill).

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05 Z750S
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YOMAHOMIE03

I started it again and it actually stayed running for a bit but then when I revved it up white smoke started coming out of the exhaust pipe. Thanks for the comment. I will check it out. Where is the float valve at on the bike? It's an 09 250cc Ninja. This is why I don't mess with carbed bikes. I'll stick with me fuel injected bikes.

Dablue1

Have you opened up the airbox to see if the air filter is saturated with gas?
If you open up the airbox while the bike is running, it can tell you a lot.
Also if that much gas is leaking, you may be able to see it in your oil as well. How does the oil look? How doe the bike run overall?
I posted a probable cause on your last thread.
Leaking gas

YOMAHOMIE03

Yes....I did have the air box open and it had quite a bit of gas in it. I am getting ready to run it without the air box on to see how much gas is coming through the carbs today. It definitely looks like gas is in the oil as well.Anyone know where this float valve is located?

Dablue1

Inside the carbs. You may need a service manual if you are not sure how to inspect and repair the problem.

locknload

the mythical "float valve" is sometimes refered to as the "needle & seat" in the carb. clean the carbs & sync.

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YOMAHOMIE03

Dablue1, thanks for the service manual link. I really appreciate it. The carburetors are off and about to clean them in a few, but not sure of what I'm looking at to see what could make so much gas run into the air box. Also I took the air box out,the air filter was soaked in gas and the gas/oil mixture was sitting inside there as well. So, I'm assuming I have to change the oil as to. I really do appreciate all of the advice..., as I am not very familiar with carbed bikes.

Jeff in Kentucky

Here is the first in a set of 3 videos for carb cleaning, but yours has 2 instead of 4 carbs. Adding Seafoam to the fuel at least once a year, especially before long storage, will help keep the carbs clean:

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Dablue1

A few things can cause gas to flood the engine;

Having the petcock on "PRI"
A faulty petcock when in the "ON" position
Stuck float bowls and dirty carbs
Reversion

Also if the crankcase is flooded with oil and gas, it can be forced back into the airbox will the engine is running. An overfilled crankcase can lead to damaged engine seals and increased engine pressure that can make the engine hard to run.

Drain all the oil, replace the oil filter, add new oil.
Remove the air filter, clean, relube lightly and replace it.
Remove and check the plugs. If sooty/oily and black, clean or replace them.

Remove the gas line from the carb, if gas flows without the assistance of a vacuum in the "ON" position, then the petcock may be the problem.