Question about 2004 kawasaki KX 250

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I have a 2004 kx 250 and it runs for about 10 mins on a new plug then cuts out

My kx runs on a new plug for about ten mins then cuts out but then when you take out the plug and clean it it will start and run for less than a minute then die and it splutters when running as if the choke is stuck on but its not! need help asap!!!

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  • 430 Answers

Sounds like a failing ignition coil or trigger. If you let it cool for a long while it will closer to ten minutes and the plug is dark and fluffy then its weak spark. Check the coil ground and wire condition also.

Posted on Oct 25, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

rselvy
  • 83 Answers

SOURCE: kawasaki kx 250 fouls spark plug in 30 minutes

You definitely need to change the oil mixture to at least 40:1, use a good grade of 2 stroke oil. You do NOT need to return the bike. I'd highly recommend using an NGK B7EV spark plug. A hotter plug will stop the premature fouling. I would not recommend you decrease the oil to 50:1 because you are essentially robbing the engine from adequate oiling for the piston, KIPPS valves and the bearings. The hotter plug will make a huge difference but remember if he gets to the point where he is able to ride the bike to it's potential he will need to run the cooler plug, B8EV or B9EV. You can also use a cheaper plug in the same heat range, B7ES or B8ES. Those plugs should cost about $1.25 ea. and are an affordable cost of running the bike. It's not uncommon to replace a spark plug frequently, it's the nature of the 2 stroke engine.

Posted on Dec 08, 2008

  • 6 Answers

SOURCE: My KX 250 keeps dying on me

try nexted hottest plug for ex. i had a b8eg standard and went to b7eg

Posted on Jul 12, 2009

Audioaholic
  • 376 Answers

SOURCE: motorbike wont start after running engine

possible bad rings allowing excessive oil seep up and wash spark out on next fire. do a compression check, ck for proper spark, and fuel....hope this helps

Posted on Sep 13, 2009

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  • 164 Answers

SOURCE: klx 250 will not start new battery new spark plug

You say you cleaned the carby sounds to me likethe beast is either sucking air around the inlet manifold or that the float needle is stuck in the seat.recheck the fasteners at the manifold remove the float bowl & check the needle & seat takeing particular care to make sure there are no small particles blocking fuel flow throug the needle & seat. regards geoff

Posted on Apr 24, 2010

RaidX
  • 632 Answers

SOURCE: Kawasaki Ninja 250 running problem

This could be due to timing screw being incorrectly set
Locate gold timing screw on the carbrettta turn it clockwise only slightly till bike idles without choke on, Then when choke it on it should idle a touch higher.

Posted on Jun 22, 2010

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incorrect jetting
incorrect ignition timing
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intake leaks
exhaust leaks
incorrect fuel oil mixture
overheating
is it burning the electrode off or carbon fouling the plug
sorry for the long list, there is probably a few you might discount as you have already checked

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Kx250


Check gas cap vent by running with cap loose.If this clears it up go with a new cap and vent hose.If not check the engine compression.

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