Question about 2005 Yamaha TT-R 125 L

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Gas leaking from bottom of carb on 90cc ATV

I have a 90cc 4-wheeler (Aeon Cobra to be exact), and it appears that gas is leaking from a missing tube at the bottom of the carb. It looks like a tube might go there, but I am unsure as there is nothing there and had no problems with it until now. When the gas is on, it just pours out the bottom of the carb. There is a small screw that when opened, lets gas drain out the same hole (with gas shut off, just drains remaining gas from the carb), but when the gas is on, it just pours out. Is there a tube that is supposed to be connected to the bottom, and if so, where does it go? Is there another solution to what could be causing this?

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  • zach719 May 31, 2009

    I also read on a couple other posts that this may be the issue. For tonight, I tapped on the carb bowl and that seemed to stop it... once I turned the gas back on, it started up, ran rough for a few seconds, and now runs good with no leaking gas. I will take the carb off and clean the floats and the bowl.


    Thank you so much! I was worried I was missing something serious from it. I am a computer nut, and not very mechanically enclined should I say LOL. 

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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

Posted on May 31, 2009

  • George May 31, 2009

    Could you post a good review for me?

  • Brian K Hawkins Jul 23, 2013

    ty this was very helpful

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CHECK THE NEEDLE VALVE IN CARBURTOR

Posted on Oct 02, 2009

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I think that screw is a drain try to tighten it.
if it doesnt work let me know.

Posted on Jul 23, 2009

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