Question about 2002 Hyosung GV 250 Aquila

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When trying to start the bike. Gas leaks out of

When trying to start the bike. Gas leaks out of black tube. Possible carb problem with needle and seat corroded

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  • reefpass
    reefpass May 09, 2009

    Thanx for the info. tswinter. I'll check it out tomorrow

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That's probably the overflow/flooding tube. Try starting it without the choke and/or with partial choke..Yea floats are stickin or needles are dirty..Good Luck..Tim

Posted on May 08, 2009

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1 Answer

Gas leaking through overflow


Your carbs need cleaning and setting,, the needle and seats are what controls the flow of gas into the float bowls... the floats movement (up and down) regulate the movement (opening and closing) of the needle and seat

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I justgot a 95 kawasaki 500. i just cleaned the carbs and put in a fuel filter. i put bike back together. there is a black tube running out the back of the bike starting from after the carberatuor an


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).

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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!

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1 Answer

1994 FXDL Harley plugs keep fouling gas smell strong


It appears that you have what we used to call a bleeder. Where the carburetor leaks gas into the manifold past the jets. I have found instances of this in the 2nd market carburetors especially. It is possible the carb may need rebuilt and gas is leaking past the needle on the float. If not then I would recommend replacing the carb. I have always had excellant results from Mikuni on these big bikes.

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1 Answer

Hi,my zephyr 1100 keeps flooding back on carbs,fitted pilot jet kit and set floats,all started with not running bike enough,its a 1993 with only 6,800 miles,help.


onee of you carbs needle and seat is not closing all the way if you leave the gas on and remove the overflow tubes from each carb yuo should see this one leaking make sure bike is sitting up right so fuel isnt just running to one side

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1 Answer

1979 dt 175 lower fuel overflow line is leaking gas until I start the bike, then it stops while the bike is running. When I shut the bike off the fuel starts running again till I shut off the gas. What...


Two possibilities.
1. Your float needle is leaking (most likely). Remove the carb, remove the float bowl. You will see the float itself and it has a tang that touches the float needle. Remove the float and inspect the needle and its seat for dirt or wear. You could try gently tapping the float bowl first, as this may dislodge and dirt, but thats a short term solution.
2. The float level is incorrect. You will need to bend the float tang to adjust. However, find out the float height for your bike first.

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1 Answer

I've got a 2005 650 that is pouring gas out of a tube under the carb. It only pours when its started and running. Won't idle


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!

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yes there is a tube that goes on it. It hangs straight down about an inch or two past the botom of the 4 wheelers frame. It is for a overflow of gas, which is usally caused by either dirt in the carb holding the float to high and allowing the gas to just run straight thru and out the bottom of the carb or a bent or maladjusted float setting. But since you said it just started, i would suggest this. I have fixed many and many bikes by simply removing the carb bottom and cleaning it with carb cleaner. It onlty takes a small piece of dirt between the float needle to keep the needle from making a good seat in the carb. Clean it well Please be carefull and keep the carb well away from your face as to not get any blowback of cleaner in your eyes(IT BURNS) This should fix your probblem

Let me know

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1 Answer

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That tube would be the overflow tube. Your carb float is sticking open and allowing fuel to flow in constantly. You need to take carb apart, clean needle valve, and inspect or replace carb float.

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2 Answers

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sounds like you have either a stuck float or a needle and seat leaking your carb is overflowing and coming out overflow tube. could try adding a carb cleaner additive to your fuel but chances are you will have remove and clean carbs or replace needle and seat jim

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