Question about kawasaki KX 125 Motorcycles

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I started the bike and was at full throttle when running but throttle was not sticking maybe floats stuck,so i took carb off cleaned it and put it back on know bike won't start at all ,i have spark going to spark plug i checked ,the carb is getting gas ,i open the bottom bolt where floats are and gas was coming out.Don't were to go from here.

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Are you certain the throttle butterfly or slide (depending on what model bike you have) is seated...if the actual throttle in the carb throat is not closing, starting bike cold will be very difficult as you are feeding in too much air.

Posted on Mar 18, 2011

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When I turn the gas on it leaks out of a hose at the bottom of the motor I think it's a return line , I can start the bike and it doesn't leak as bad but it still leaks help please


Sounds like the float in the carburetor is stuck . Try taping on the carburetor with a handle of a screwdriver or something . Sometimes it in sticks the float . If it continues I suggest removing the carb taking off the float bowl and cleaning out the carb . Maybe you tube it it can be very easy but also delicate and fragile don't force pry or bend any parts.
The reason it he fuel stops coming out of the over full tube while it is running is bc it is using the fuel fast enough to stop the float bowl from over filling. If this bike sat for a while with fuel in it the fuel turns to a varnish and clogs up fuel passages causing sluggish purformace bogging when twisting the throttle and floats to stick and carbs to over flow . You might just have to go through the carb.

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1 Answer

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Hi, Marcus and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
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For more information about your issue and valuable "Free" downloads that you will need please Click on blue links below. Good luck and have a wonderful day.
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1 Answer

Kmx 125 wouldnt start but after having carb sonicaly cleaned, it started so took it out on the fields and had a brilliant day running the bike. got back home put it in the garage and after a few days went...


make sure your float isn't sticking, whats happening is its flooding itself while it sits,, and by you removing the cover and filter its allowing a massive flow of air to blow out the flooding and get the fuel air mix a little better,, see if it will start while holding the throttle wide open,, if so, your float is sticking

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1 Answer

81 Suzuki gs650 #2 carb floods gas out after start


The float is stuck open in the leaking carb. Remove the float bowl and clean the carb after removing the pin holding the float in place. While the float is out, shake it to see if gas has gotten inside it. If so, you will need a new float or will need to drain the float then re-solder it to seal it up again. To drain the float chances are you will need to drill a vent hole in it to allow the gas to drain. Just solder the vent closed when done.

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2 Answers

Leaking gas badly from carb. 2003 750 shadow spirit


The gas has varnished and turned to ****. You need to take it to a shop and have the carbs cleaned. Next time you decide to store the bike put fuel stabilizer in the tank and run the bike untill the stabilizer gets into the carbs. When you want to store it, turn the gas off and let the bike run all the remaining gas in the carbs out. That is your best bet. Chaz Moto DC

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2 Answers

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Its flooding( the carb)..probabely there is some kind of dirt at the float pin and thus not closing to stop the flow of gas to the flaot chamber once its full.
Clean and reset the float level.

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1 Answer

My honda shadow 600 vlx float is sticking open.


keep eye on filter you may still have some rust in system

Oct 13, 2009 | 2005 Honda VT 600 CD Shadow

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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.

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1 Answer

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If there is any gas flowing out of a Mountain Bike you have serious problems.

In reality you have a Motorcycle, not a Mountain Bike.

It's almost surely a stuck float valve. Try banging on the float bowl with a rubber mallet, but not too hard. You should really take off the bowls and clean them out, then replace the float valve pins and check the floats for any holes or for sticking action. Sometimes the floats will stick open due to rust gunk or old gas gummed up in there. I use Sea Foam fuel additive to help keep the carb clean. You could try running a half bottle of that through a bit, but I'd start by getting that bugger unstuck first.

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