Question about 2003 kawasaki KX 125

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1998/99 kx 125 fuel leaking from carb outlet at bottom

Leaks fuel when engine is off , seems ok when engine is running, i have to turn fuel to off position to stop fuel leak, ive checked the floats which seem to move freely!!!!!

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Sounds like the needle and seat may be the problem

Posted on Apr 15, 2009

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No, it's got to do with the float in the carb. there is too much fuel in the carb so it overflows. Try bending the the plate on the float and see if it get's better or worse. Mine was not leaking and I adjusted the float level and now it leaks, I'll have to adjust it again to fix.

Posted on Jun 27, 2009

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1 Answer

1995 Kawasaki KX 125 leaks fuel from the carburetor


Hi, Jeff you need a carburetor rebuild kit that has both needle and seat 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 the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
8. Damaged petcock diaphragm allowing fuel to flow through the vacuum line into the combustion chamber.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
https://www.kawasakimotorcycle.org/forum/kawasaki-motocross-offroad/46372-major-problem-fuel-running-out-carb-kx-125-a.html
kx125 carb leaking out of overflow
Kawasaki KX125 Service Manual
OEM Parts for Kawasaki
1995 Kawasaki KX125 Owner Manual

Aug 14, 2018 | kawasaki KX 125 Motorcycles

1 Answer

2003 Kawasaki KX 125 is leaking gas out from the overflow


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 the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
8. Damaged petcock diaphragm allowing fuel to flow through the vacuum line into the combustion chamber.
9. Contaminated fuel tank.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
My carb leaks fuel out of the overflow hose at the bottom of my carb
Major problem fuel running out of carb kx 125
03 08 Kawasaki KX 125 250 Service Manual pdf
OEM Parts for Kawasaki
2003 Kawasaki KX125 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Mar 30, 2012 | 2003 kawasaki KX 125

1 Answer

2001 Kawasaki KX 125 leaks fuel from the carb overflow


Hi, Montyrobinso 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 the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
8. Damaged petcock diaphragm allowing fuel to flow through the vacuum line into the combustion chamber.
9. Contaminated fuel tank.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
kx125 carb leaking out of overflow
Major problem fuel running out of carb kx 125
https://www.howtomotorcyclerepair.com/images/Kawasaki-KX125-KX250-Service-Manual-Repair-1999-2000-2001-2002-99924-1244-04.pdf
OEM Parts for Kawasaki
2001 Kawasaki KX125 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Dec 16, 2011 | kawasaki KX 125 Motorcycles

1 Answer

Ok, i recently purchased a DTR 125 R 2000 model with running problems The bike will start with the choke on, then die with the choke off, the fuel/air mixture screw was mashed up so i purchased another...


Sounds like a vacuum leak is leaning out the mixture....check the intake between carb and engine for leaks...another source may be tjhe crankcase seals are leaking.

Mar 31, 2011 | 2000 Yamaha DT 125 R

1 Answer

My 1974 kawasaki ke 125 is leaking gas out the bottom of the engine. what is wrong with it?


Several things could be wrong. First, the fuel petcock (valve) at the bottom of the gas tank should be turned off when the bike is not being ridden. Also, it is possible the valve may not be fully shutting off the gas. This can allow the carb to overflow and leak gas. A stuck open or punctured float in the carb bowl can cause overflow. The float should be light as a feather and have nothing inside it but air. Is the carb securely mounted?

Check for cracked fuel hose or bad connections at the tank and carb. Is the fuel valve body leaking gas where it mounts to the tank? Heck, with the bike being 36 years old the tank may be leaking at a weld or due to rust through. I wish I could work on your bike. The older bikes are more fun to work on than the newer bikes. Post a reply and let me know what you find.

Aug 09, 2010 | 1976 kawasaki KE 125

1 Answer

2001 kx 85 has sever low end hesitation. I can't tune it to save my live. won,t idle properly. when at idle if you crack the throttle it will bog and then rev up


Hello you have a
1. fuel starvation problem clogged carburetor jets.(clean the carb)
2. Intake leak carb joint/intake manifold.( start your motor get it to idle best you can spray wd40 around the carb joint if the rpms change you have a leak replace the carb joint or gasket/o-ring as needed.
3. crankshaft main seal magneto side leaking or worn main bearing.
check end play on the magneto side remove the cover plate firmly grab the end of the shaft with up an down motion if you can feel it move replace the main bearings and seals.
These are problem that will cause your motor to run lean and hesitate.
Hope this helps you with your problem

May 10, 2010 | 2003 kawasaki KX 125

1 Answer

Does anyone know what the compression ratio is for a kx 125


Why? What compression reading you got?

Generally less tha 90 it wont run. 140psi would be good. Over 160 would be too much.

If you havent shut the fuel off and the carb leaks then it likely that the crankcase is full of fuel and will give a false compression reading.
The most obvious way to check is to remove the expansion chamber, shake it around and listen for fluid in it. If it has fluid in it- IT GASOLINE- it will burn/ ignite!!!!! Be very careful and dispose of properly
Once you are sure the crankcase isnt full and the carb is right then check compression

Dec 20, 2009 | 2003 kawasaki KX 125

1 Answer

Wont eyedole with choke off


sounds like its running too weak ,thats why it runs ok with the choke on, check for air leaks around carb- engine and carb - airbox , use wd 40 and engine note will change when leak found..

Nov 09, 2009 | 2006 kawasaki KX 250 F

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

Apr 04, 2009 | 2002 Yamaha TT-R 125

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