When i turn the fuel on to start the bike gas pours out the clear tube that comes from the carb to under the bike some were is this line dis conected or broke or is it something more

After replacing all rubber and brass parts, set up the float height with the new needle valve.

You don't say what kind of bike or give any other details so I will go with the obvious stuff first, I am guessing you might not ride it often or let it sit up for awhile. Gas pouring from the vent indicates that a float valve is stuck or the needle valve or seat seal has dried up and has fuel being forced around them as the fuel pump pressurizes the carbs. It is dangerous to run the engine with overflow as you could have a fire so your remedy will require you to pull the carbs to fix the problem.

Its probably the crankcase vent. The carbs have more than likely been pouring gas inside the motor,to the point of overfilling the crankcase oil with gasoline. Drain the oil and change the filter. And while youre draing it,..look inside the carb bodies,and see if gas is still running into the cylinders.If it is,then your float height is not set correctly..(too high)...or the needle valves need to be replaced. (valve that hooks onto the floats).

1. If it only runs in the pri position, that means that the petcock small rubber line is not connected to a vacuum port which is normally in the engine side of the carbs. If you unplug the fuel lines at the petcock and place a vacuum on the smaller rubber line (coming from the petcock)using a hand held vacuum tool or your mouth, the petcock should flow gas each time a vacuum is created and stop when the vaccum stops. If the petcock does not stop flowing gas when the vacuum is released or does not start flowing gas when a vacuum is applied, then the petcock needs servicing or replacing.

2. The fuel is still spilling out because the float is sticking or out of adjustment, or the needle&seat has trash/rust in it or the needles&seats are bad. The float should swing freely on its pivot shaft. The needle sometimes has a spring loaded plunger in top that should freely move back and forth when pressed with the finger and if not replace it or free it up. Setting the floats will vary with manufacturers so consult you service manual for the proper procedure. If the floats are set too high, gas will continue to come out. Some floats have no adjustment.

3. If the tank has rust in it, replace the tank or put a rubber liner kit in it so that it ceases to release rust back into the carbs. Filters will not normally stop rust so the tank needs to be free of rust or fixed with a liner kit.

4. The 4 tubes (if coming from the bottom of the carb fuel bowls) are just overflow tubes and hang down on the backside of the engine. If these 4 tubes are coming from the sides of the carb (about midway up the carb body), these are also vent tubes and just hang. These 4 tubes in question should be smaller than the fuel lines on the carbs and about the same size (maybe a little smaller) as the small vacuum tube coming off of the petcock.

5. If the bike is still boggy and/or hard starting when done correcting the fuel spilling issue, that is because the carbs are still partly plugged. Most carbs do not get cleaned out correctly because most consumers do not have the proper wire drills to go through the jets to get them cleaned out. Some jets get under .010 inch diameter which is really small. The only other way to properly clean the carbs are to totally disassemble them and soak them in a caustic carb cleaner made for cleaning and removing fuel deposits

the floats in the carb are stuck or adjusted to high

There could be debris in the float bowl preventing the float valve from closing. If this is the case it is likely this debris may get into other passages / circuits within the carb. Or the float has become full of fuel itself and cannot exert enough pressure on the valve to stop the flow of fuel. Also the float level has to be at the proper height to meter the fuel at the proper rate of flow for the engine in all conditions. Too low and the bike will starve for fuel before the valve can respond....to high and it'll pour out as your friend's is doing.
Drop the bowl off the carb and check to see if the float is full of fuel or there is any sign of debris in the bowl. Any sign of crud in the bowl and I would suggest cleaning the carb. You may be able the clear things enough to get the fuel to stop flowing by messing about but may have trouble down the road shortly if you don't get it all **** and span.
Do some more research into cleaning the carb as there are some parts you need to be careful of exposing to chemicals like solvents and cleaners...the rubber tip on the needle valve on the float. Basic rule is don't soak any plastic or rubber bits in any nasty chemicals. Same goes for you...lol...
You can check the float level without removing the carb by shutting of the gas and draining the float bowl. Take a short piece of clear tubing (8 inches or so) and slip it over the nipple where the drain screw was. Hold the tubing alongside the carb / bowl body so the open end is up and above the level the fuel should come to. Mark a small line on the tubing say 1/4" above the join between carb bowl and body. Turn on the fuel and observe the fuel flowing into tube....once it stops carefully lower the tube until the line you made is even with the split between bowl and body. The fuel shold stop flowing just before the top of the bowl....measure between your line and the fuel level....in your case the fuel may well just keep climbing out the tube as it seems you have issues there. After you get it sorted out this info is more useful.

Air screw setting = 1 1/2 turns Float height = 15 - 17 mm Fuel level = 0 - 2 mm below edge of bowl.

Hi
Check/replace inline fuel filter. Put a fuel injector/carb cleaner fluid in the tank and run it through, this will clean any build up that may be in carbs/injectors.
If problem is still persisting then you'll need to get carbs/injectors removed for cleaning and resetting. Hope this helps, let me know how you get on.

Jason

Your carb has a hung float or needle and seat issues.

You have to take the carb off the bike and consider replacing the float and/or needle and seat.

You might get by just raising the float level. But this is only a stopgap maneuver. Buy a new float!

You bike is flooding so it wont run right until this is fixed.

The reason its only flooding while its running is because your bike has an automatic gas tank valve that opens when the bike starts and makes vacuum that opens the valve. It is saving you from the bike totally filling up with fuel!

Synchronizing and balancing the carbs will be a nightmare. I would make a diagram of what hoses attach where and mark each hose. If you remove any adjusting screws or jets, write down the number of turns it takes for removal and than put each one back the same number of turns. Before removing the carbs, drain them (assuming there is anything in them). Now get a spray can of Berrymans carb cleaner (or another brand), and fill the float bowls full of cleaner by disconnecting the fuel lines and spraying into each fuel line until the level in the line is reaching the top of the float bowl. Now wait for a couple of days while the cleaner softens the dried varnish residue in the carbs. Now remove the carbs as a set then dis-assemble and clean with a couple more cans of cleaner. Getting the pilot jets cleaned out is the big trick. If it will not idle, the pilot jet is problem.

Below is a diagram of your carb. The same diagram with the entire carb assembly AND your entire bike can be found at Babbitt's.
Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx

Wait... fuel is pouring out of the crankcase breather? Are you sure it's not the carb overflow tube? The crankcase breather should be going back into your airbox or through some kind of filter. If gas is coming out of there DO NOT START YOUR BIKE. It means that gas has gone from the tank through the carbs into the cylinder and is now in your oil. Thinned out oil is the devil for bikes. Sounds like you'll need to clean the carbs and set the float bowl height and maybe rebuild the petcock. Check to see if any fuel is coming out when the petcock is turned off. If it only has on pri and reserve then check for gas in the vaccum tube.,,