There are two clear tubes coming from the carb- going towards the front of the bike. they look like the are just vent lines. when i turn the gas to on or to reserve the gas pours out these two lines ??? this is a 1986 big bear four wheeler

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.

Here's S&S's manual for the Shorty Carbs (both E & G):

http://www.sscycle.com/files/7913/7033/9802/51-1012_carb_e__g_series_shorty_carburetors_installation.pdf

On page "10", it states, "Slip fuel overflow hose onto fitting on carb bowl and neatly route behind pushrod tubes. On a big twin model, hose should go toward back
of engine. On a Harley-Davidson Sportster model, hose should go toward front of engine. Exit end of overflow hose must extend down
below engine and away from exhaust pipes."

This is the only "vent" hose (actually, a fuel overflow hose) that I know of.

Where is it leaking from? The bowl gasket or the vent tube.if its the vent tube the needle an seats r sticking or not seating or float level got out of adjutment or pin fell out.if its the bowl gasket......well u know!

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 fuel control valve on the fuel tank must be defective on the gas tank, it is designed to shut off when the engine vacuum signal is not present, I susspect yours is stcuk on, this causes the carb to overfill and run out the tube.

Most 50cc bikes have three tubes plus a fuel line from the gas tank to the carb. There should be a tube from the battery, a tube from the carb and a tube from the gearbox. All three tubes are just vents to the atmosphere. Chances are the tube in question is the one that vents the gearbox, hence the oil. Please rate my answer.

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it's probably just your overflow from the float. it doesn't connect to anything, it just let the fuel overflow come out when your float level is high. if you turn on the fuel petcock and it starts pouring out, your float needle is sticking. clean the carb and the float needle valve assembly and see what happens.

there should be a vacuum hose coming from carb 4 that goes to the port on the rear of the petcock. as for the other 2 they are feed lines the 1 facing the rear of the bike goes to a hose between carb 1 and 2 and the 1 facing the front of the bike goes on the hose between carbs 3 and 4. the 2 remaining hoses on the carbs get criss crossed across the carbs and draped down thru the holders on the frame they are just overflow tubes incase you dump your bike. the other hose on the tank is a vent tube. hope this is helpful.

The usual culprit is a blocked vent tube. Verify it's open. The usual indicator is either a pressure release when you open the gas cap, or a vacuum "sucking" noise when opening it first thing in the morning. On a carb equipped bike, the carb overflow lines will leak, but in a fuel injected bike like yours, it'll be out the overflow vent. The next time it begins leaking, open the gas cap. It should stop immediately as pressure inside is released. Good luck.