Question about kawasaki KX 125 Motorcycles

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Kx 125 just died while riding and it will not start. It has plenty of gas and the oil is good. The spark plug was fouled and wet, cleaned it up and put back in and tried to start and still not getting anything. IT seems to have spark as I put the plug into boot, kicked and it seemed to have compression and spark.

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6ya6ya
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Posted on Jan 02, 2017

FoRdMaStEr
  • 51 Answers

SOURCE: 1997 yz 125 wont start, please help

2 stroke bike are very dependent on compression. and being a bike that is 12 years old my best educated guess is that the top end needs to be rebuilt. i usually have to have the top end done on my honda about every three years.

Posted on Jan 13, 2009

  • 2 Answers

SOURCE: I have a suzuki 125 ts was riding it then stop for

is it getting fuel? try tipping a very small amount of fuel down rhe plug hole, replace the plug if it fires you have a carb problem.

Posted on May 02, 2009

  • 7 Answers

SOURCE: my rm 125 was running good for 45 min then it

clean your carburator, and if possible do a compression check, how longs it been since you replaced rings and piston.

Posted on Jun 23, 2009

Dvljay878
  • 20 Answers

SOURCE: NSR 125 ran out of two stroke oil and got hot,

Sounds like you have very little compression. Or a reed may be broken.. Make sure reed cage is tight an not sucking air... Id go with the compression test tho..

Posted on Jul 07, 2009

bozcro
  • 867 Answers

SOURCE: hey guys i'm lost i bought a 04 r1 they said it

is the spark nice and blue? if orange, coil is weak and needs to be replaced.

Posted on Aug 08, 2009

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3 Answers

I was out riding my kx 125 and the engine just died. It won't start and the engine just backfires. It has plenty of gas and the oil is good too. Checked spark pllug and it was fowled and wet. Cleane


for kx125, that kind of problem i kind of remember my friend just like that too. so clean everything inside . so u have to changes the valves and also the lifter then do the piston pin too,.also chick the rod if in good! that's it for now then when u do that tell me what going on!

Dec 29, 2013 | kawasaki KX 125 Motorcycles

1 Answer

Hi, i was riding my kx 125 03 yesterday and the dyed on me


Hi,would start by taking the head off and have a look at the top of the piston, if it hasn't got a hole in it.. good....the bottom of your plug may have broken off, this may have damaged your rings so you'll have no compression. You'll have too strip it down further. When you're sorted check your oil/petrol mix and your air screw setting then check your plug regularly for discolouring or oiling up. Go for it, and be methodical.

Mar 12, 2012 | 2003 kawasaki KX 125

1 Answer

Hi i would just like to know if there is a common problem with the kx 65 I took my son riding today and the bike was running good then it stalled on him now it won't run I got it started for 5 sec then...


No common problems to the KX in particular but very common to all race bred 2 strokes is they all require lots of love and attention so clean air and pilot jets regularly clean air filters regularly make adjustments to the fuel air mix screws to suit time of day and altitudes etc regularly and if you ever have problems starting and stalling throw away the spark plug and replace as you no doubt would have fouled it and the plugs never return back well after that no matter how new they may be!
Revisit your fuel oil mix also depending how you ride and where you ride you may want anything from 30:1 mix to 50:1 mix to give reliability (35:1 - 40:1 mix is good place to start?)
I would change spark plug and clean pilot jet in carbi as first steps for this problem then once sarting again do some tests on different fuel mixes (small steps at a time though) to see what works best
good luck regards Jamie

Jun 03, 2011 | 2010 kawasaki KX 65

1 Answer

My 2002 Honda Cr 125 will not start. After about 20 kicks it makes this popping noise from the exahaust. It has good gas and the carb has been cleaned.


pull the spark plug check if it is wet/fouled,clean and dry it,then ground the pug to the head spin the motor and che the spark to see if you have spar arching across to the electrode tip if it is not and you hear but do not see it and it is sparking within the body of the plug replace it.

Sep 08, 2010 | 2002 Honda CR 125 R

1 Answer

Need gas-oil ratio on 2004 kawasaki kx 125 2 stroke bike


32:1--40:1 any less than 40:1 And you take risk of damaging engine(crank and top end),Any more than 32:1 and it will smoke real bad and foul spark plugs alot.....

Aug 01, 2010 | 2004 kawasaki KX 125

1 Answer

Spark plug keeps oil fouling. What band of oil shoul use? Is 40:1 gas mix good? also wat spark plug? BR9ES, BR8EG, or R7376-9?


32 to 1 is the standard mix. That is 4 ounces two stroke ENGINE oil per gallon. The brand doesn't really matter. Don't use MOTOR oil in the gas. The stock plug is NGK brand, R6918B-9. I would suggest a hotter plug, R7376-8. The last digit is the heat range. The lower the number, the hotter the plug.

Feb 11, 2010 | 2004 kawasaki KX 125

2 Answers

Gets hot, sizes up.


Clean carb. Pull apart and soak in carb cleaner. Blow dry with air nozzle. Make sure air filter is clean and plenty of air. Make sure spark plug is not gapped wrong and running to hot. Make sure oil/fuel mixture is accurate

Nov 12, 2009 | Poulan Wild Thing 2375 18" Gas Chain Saw...

1 Answer

Fouling plugs


Get a new NGK spark plug one heat range hotter than stock. Be sure the fuel mix is 32/1 using two stroke engine oil ( not motor oil ). A 32/1 mixture equals 4 ounces oil to 1 gallon of gas. Remove the cylinder head and de-carbon the top of the piston and head.

Please rate this solution. Thanks!

Apr 07, 2009 | 2003 kawasaki KX 125

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