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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.

Posted by Paige Sievers on

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Whats making carb flood with gas after bike is started and runs just a min or so then gas runs out carb over flow hose. I have replaced carb float and jets are all clean.


Hi Paige, Seems like the problem is where the float and needle meet, The needle and seat let the gas into the bottom of the carby and as the gas rises the float rises as well pushing the needle up into the seat slowing the gas flow into the bottom of the carby.... As the motor's using the gas in the bottom of the carby the float's lowering and the needle lowers as well allowing gas into the carby, If the part of the float that meets the needle is bent down slightly it's going to let more gas into the bottom of the carb because it's not pushing the needle up when it should, YOU NEED TO BEND THAT PART OF THE FLOAT UP SLIGHTLY TO STOP THE GAS COMING OUT THE OVERFLOW.... I hope you know what I mean....CHEERS..

Mar 28, 2016 | GAS Motorcycles

1 Answer

I have 97 marauder vz 800, the bike was in for a carb clean out a month ago rode it once and then put it in storage i tried to start it today and noticed a fuel leak, i took the tank off and checked the...


Hello Colin, the fuel leak from the upper hose would indicate excessive gas due to flooding, as you stated. It could be the float has stuck and not letting the float valve close to stop the fuel flow. This happens a lot when a bike is stored... Other possibilities - The float could have a pinhole in it causing a high fuel level, or not adjusted properly. Also, make sure the choke is not stuck partially closed. Remember, a "wet" gas soaked spark plug will not fire, so it's best to replace the plugs after they have been flooded or fouled. I hope this information is helpful.

Nov 07, 2011 | 2000 Suzuki VZ 800 Marauder

1 Answer

I have a 1986 suzuki 650 savage the carb seems to have a problem. It started flooding gas coming out the over flow. I took it off and took the float cover off and replaced the needle needle set and float....


Yea these carbs can be a real pain sometimes to get right. First thing you need to do is varify the float seat is working and totally stopping all fuel flow.... and all the jets, main, pilot and choke circuit are absolutely clean. Bench test the float needle valve by connecting a hose to the carb fuel line nipple and letting gas gravity feed as it would in a run position. if it tests ok, remount it on the bike...
i'm guessing you have a vacuum petcock on this year model? If you do, it needs to be inspected.
In the "on" position you should have no gas flow coming through the petcock, In the "prime" position it free flows. If there is a hole in the diaphram the engine will **** gas and not air (vacuum) through the hose and it will flood. If you don't have a vacuum line on your petcock then it is a different kind. Be sure to check your crankcase, it could be way past full with gas that has entered, dont start your engine like that...drain it all out. make sure the air filter is dry. You will have to replace the spark plugs...a gas soaked plug won't fire.
Good luck, i hope this helps.

Jul 16, 2011 | 1986 Suzuki LS 650 Savage

2 Answers

When turn on petrol and kick bike, petrol is running out of overflow pipe on carb and bike wont start, and bike sounds flooded.


You have a sticking float in the carburator, due to old gas, or dirt. The float moves a needle that turns on and off the flow of fuel into the carb bowl.

Mar 23, 2011 | 2003 Suzuki RM 125

2 Answers

Fuel leak on my 2000 sporster 1200c


i agree with you.  i had the same thing happen to me varnish on float caused it to stick in the down position when i turned the gas on it would flood out i had to change my oil to. did you stablize it if not get the carb. cleaned and make sure you fog the cylinders and add fuel stablizer to gas dont run it empty and think its good enough its not.

Mar 13, 2010 | 2000 Harley Davidson XL 1200 C Sportster...

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!

Mar 07, 2010 | 2005 Yamaha V Star Classic

2 Answers

Air box and crank case fuel flooding problem happened before, thinking it was stuck or worn float needles; I installed 2 Carb float needles left side facing rear of carbs , all larger main jets, all...


Well there only one way the fuel can get into the crankcase and that's from the fuel tank. The petcock must be draining and the float needles are not stopping the fuel flow. Do you have a prime position on the petcock? If so do not run the bike in the position. Try topping the tank off with gas and letting it sit for a while and see is the gas has gone down and then check the crankcase and see if there's fuel in it again. i still say its got to be your petcock.

Sep 29, 2009 | 2005 kawasaki ZRX 1200 R

2 Answers

Virago cyl flooding xv700 1984


let me tell you how i check to see if the float and needle valve is working properley in a carb. take the carb off git a hand pump off a out board motor. hose and all take the ends off put the suction end in a can of gas and the outlit end to the gas inlit on the carb. squeez liteley on the bulb that should let you no if the carb is leaking some ware. if not then you no for sure that the problem is some were else.goodluck davidbaxley.

Apr 17, 2009 | 1988 Yamaha XV 535 Virago DX

1 Answer

Mass flooding piston cylinder


This sounds to me like a carb float being stuck open. Turn off the gas and drain the carb. Next, turn the gas back on and sharply tap the float bowl with the plastic handle of a screwdriver as the fuel bowl refills. The goal here is to vibrate the float to free it up. If doing this process a couple of times does not free the float I would remove the carb and clean it with a spray carb cleaner. Be sure main jet and float needle are clear. Clean the air filter then re-mount carb. Next Remove the water trap bowl at the bottom of the petcock, (gas valve). Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).
Install an inline fuel filter. Turn the gas on, wait a moment for the float bowl to fill with gas then give it a try.

Please rate this solution. Thanks!

Mar 28, 2009 | 2003 Suzuki RM 125

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