Question about 2003 kawasaki KX 125

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2003 Kawasaki KX 125 is leaking gas out from the overflow

My 03 kx125 is leaking gas out from the overflow, running and off. the carb is clean and the bike starts first kick. I also installed a new pipe from Kawasaki and it spits a bit of oil from the front cone, also I mixed the gas 32:1 as it is in the service manual, and its bit boggy/smokey. I have done a bit of research about the carb and did try adjusting the float but same thing, thx @

Posted by Anonymous on

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  • kawasaki Master
  • 55,893 Answers

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

Posted on Feb 28, 2018

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: My 79 SR650 will start and idle very well. Will not accelerate

recheck the carburator/s main jets, blow them out with compressed air, they could be blocked.
Hope this helps!

Posted on Jul 11, 2009

  • 3567 Answers

SOURCE: i have a 1981 kawi 250 ltd model.i have no manual

Just burn premium gas. No oil adds to the gas.

Posted on Sep 26, 2009

DoubleClutch
  • 376 Answers

SOURCE: Air box and crank case fuel flooding problem

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.

Posted on Sep 29, 2009

Testimonial: "I will try it, thanks!"

SOURCE: I purchased a 1995 GPZ 1100 Kawasaki motorbike. It

Hope you drained the oil and also changed the oil filter.
This problem of cutting off is a carburator/fuel related issue.
I guess the fuel might not be pouring in to the float chambers faster enough.
Try this, remove the air -filter and thn start the engine and as it is about to cut off, block the intake(by your palm) at the carburators and see what happens...taking care not to over block it as the gas may pour out and also flood in the combustion chamber rendering it to shut off due to to much fuel.
If it does respond and stay running thn the problems is tht the carbs are not getting the gas as required and probabley you may have to recheck the float level, the float pin,carb synchro, air-fuel mixture.
Check the pet- c o c k too.
Hope this helps!

Posted on Nov 27, 2009

mwoodring1
  • 496 Answers

SOURCE: Have 1 2005 kx125 have about 6 hours on bike.

what are you mixing your gas at? and i would have to say a 5 yr old bike with about 6 hours on the clock is a rare thing to find or 6 hours on a fresh motor build?
How do you ride? Those 2 strokers like wide open keeps things clean.
Let know about the gas
Mark
C.C. Motorsports

Posted on Mar 21, 2010

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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.
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Hi, Anonymous for this scenario you will need your service manual, parts fiche, and owners manual if you can't find the best tool you ever bought for your Kawasaki, despair not, for a mere zero $0 you can download another one.
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Hi, Anonymous you need to locate the fuel flow origin first to isolate the problem area otherwise the usual suspects are:
1. Fuel tank empty.
2. Fuel cap or fuel tank not venting properly.
3. Fuel filter clogged with rust or dirt.
4. Fuel valve not in the on or reserve position.
5. Vacuum line to fuel valve cracked, broken, pinched, or missing.
6. Fuel valve/petcock clogged or diaphragm cracked, cut or torn.
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8. Fuel pump not working.
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10. Carburetor inlet clogged.
11. Carburetor float or needle and seat stuck.
12. Carburetor not venting properly overflow line or bowl fitting clogged, pinched, or bent.
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Hi, Anonymous for this scenario you will need your service manual that has all fastener torque specs and a wiring diagram on the back pages, parts fiche, and owners manual if you can't find the best tool you ever bought for your Kawasaki, despair not, for a mere zero $0 you can download another one.
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Hi, Anonymous for this scenario you will need your service manual, parts fiche, and owners manual if you can't find the best tool you ever bought for your Kawasaki, despair not, for a mere zero $0 you can download another one.
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