Question about 2011 Yamaha TTR125

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Leaky carb gas is leaking out of the overflow tube. what could be the problem?

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I\'m a Yamaha mechanic for 41 yrs. I deal with this every day. The carb had gas in it that sat 4 mos. or longer w/o fuel stabilizer. It has gummed-up the carb. I can almost bet it won\'t idle correctly without the choke being on as well. There is no fix from the outside. The carb MUST come off & be cleaned out. It should be boiled in a ultrasonic cleaner machine to be done right, But you can possibly do a good job with spray cleaner. But you need to replace a couple of parts. The float needle valve ass\'y is why it\'s overflowing & coming out the overflow hose on the bottom. That is a pipe that stands inside the carb bowl just above the bowl top & lets gas that rises above the gasket to run out & not overflow into the motor. That gas level is controlled by that needle valve & the float that connects to that needle. Put in a new one (approx. $20.00) being sure to not tear the new "o" ring that is on the seat that is included with it. The tin tab that the needle fits on should not be bent to change from stock, But if you tried to bend it to fix, Put it back to level with the rest of the float plate. And if you want to not need to take off the carb again, Now is the time to replace that Idle (pilot) jet $5.00, & a new bowl gasket $5.00 more. Make sure all the other jets & passages are clear tho see light through them, But don\'t make them bigger by drilling them larger than the brass they are. Set the idle mixture screw on the bottom at the front at 3 1/2 turns out from all the way in. Once started, warmed up alittle, & with choke turned off, turn the idle speed screw on the side of the carb in to raise or out to lower the idling speed. You should be done. You may need to replace the sparkplug if it\'s black from a flooding carb float. NOW just keep the 10 % Ethanol Gas controlled with a good Stabilizer like "Star-tron" or use it up in a month or two. You can\'t keep gas in it for months. Also, turning off the gas & running it till it dies doesn\'t drain out the gas. It just dies because you can\'t suck it up anymore, But the bowl still has gas in it to gum up again. If you want to drain it empty, use the horizontal drain screw on the carb bowl bottom. But remember the gas in the tank is still months old & 1/2 gumming already. BE SAFE !

Posted on Mar 25, 2014

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  • 69 Answers

Float stuck..

Posted on Mar 23, 2014

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6 Suggested Answers

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Posted on Jan 02, 2017

raffaiel
  • 209 Answers

SOURCE: 1998 yahmaha warrior overflow tube on carb

adjust the floater of your carburator give at least 2mm space on the top of it when you lift the floater so it will not overflow.

Posted on Apr 15, 2009

  • 320 Answers

SOURCE: Gas leaking from bottom of carb on 90cc ATV

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

  • 3 Answers

SOURCE: 2000 yamaha ttr90 fuel leaking out overflow tube

your float is stuck take carburator off and clean wiggle float and it shouldnt leak gas anymore

Posted on Aug 27, 2009

dmsr63
  • 2050 Answers

SOURCE: on my 2004 yamaha 660 grizzly there is gas coming

You do have a sticking float. You can test it with the bowl off by moving the float up to shut off the fuel, and down to allow fuel to flow. Look closely at the float needle seat to make sure they aren't damaged.

Posted on Sep 04, 2009

SOURCE: I have a 03 Yamaha 660 raptor one of the carbs

Did you reset (adjust)the float inthe float chamber to tht carburator which is leaking ?
You will probabley have to adjust tht float to stop from overflowing in other words we call it flooding.
Check the float pin of wear at the tip.
Hope this helps!

Posted on Mar 02, 2010

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1 Answer

Why is bike flooding and pushing gas out top over flow hose on carb after it runs for a min or two. Carb float been replaced still doing it.


Hi, Paige and the usual suspects are:
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4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
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When my bike is warm and running gas is leaking from the overflow tube. Cleaned the carb and this didn't fix it. Any suggestions?


Hi Anonymous, and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. Improper fuel level in float bowl.
5. Worn or dirty inlet valve or seat.
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5. Worn or dirty inlet valve or seat.
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1 Answer

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Hi, Blackwidowbi and the usual suspects are:
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4. improper fuel level in the float bowl.
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6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
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2 Answers

2000 yamaha ttr90 fuel leaking out overflow tube


your float is stuck take carburator off and clean wiggle float and it shouldnt leak gas anymore

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1 Answer

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is it an overflow from the carb? gas will only be in one of 2 tubes and they are the fuel line from the tank and the carb over flow. unless you have an electronic fuel pump then tubes go from tank to pump to carb. if its coming from the overflow then you are getting too much fuel into the carb float chamber. you may have a sticky float. thy getting some Berrymans B12 fuel additive and putting double the doseage in the tank. run engine til hot then leave it to stand overnight. this should break down any gum/varnish that has built up in the system

has this been in storage thru winter?

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