Question about kawasaki KX 250 F Motorcycles

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Kawasaki 250f will not start when gets hot. Push start runs great. Starts great when cold. Already adjusted valves did not help. Any idea?

2013 KX 250f will not start when gets hot. Push start when hot runs great. Already adjusted valves did not change. Cranks up great when cold

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  • Expert
  • 94 Answers

Issue with the thermostat maybe, not allowing engine to start.

Posted on Nov 11, 2014

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Posted on Jan 02, 2017

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SOURCE: i have a kawasaki kx 500 and it is getting too

Is the fuel running into the engine with it not running? If it is then you will have to remove the carb and clean out the float bowl. Check your float height and clean out the body. If the engine is running fine, you won't have to adjust any screws. If you want to decrease the amount of fuel running through the body then you would have to lower the main jet needle. Thats the one in the slide. Moving the C clip up will decrease the fuel and moving it down will increase the fuel. The large screw on the outside of the carb only moves the slide up and down for idle setting. The small screw at the back is for air movement through the carb for the high idle. The only other adjustments that can be made is changing out the jets for larger or smaller ones. Hope this helps.

Posted on Mar 11, 2009

  • 3567 Answers

SOURCE: i am looking to purchase a 2007 kawasaki kx250f

Just call your local Kawasaki dealer, or any Kawasaki dealer, and give them the VIN number and they can look it up and tell you EXACTLY what the bike is. If you call a local dealer they may know the current owner and the bike's history.

Simple thing but easy to overlook. Could I get a 4 diamond rating for this solution? I am 3 short of 100 correct answers. Thanks!

Posted on Apr 08, 2009

MakisRC51
  • 408 Answers

SOURCE: recommended spark plug for kx 250f

Stock :CR8E (NGK)
Optional: CR9E (NGK)

Posted on Jun 08, 2009

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SOURCE: i have a 2005 kx 250f backfire and no start

Chances are when the OHC was installed it was one tooth off on the timing. You have spark and gas and the bike is a single cylinder so that is what I would check. Slack in the chain tensioner is what usually creates the problem. All slack should be at the back side of the cylinder.

Posted on Jun 17, 2009

wayneman01
  • 301 Answers

SOURCE: have an 1995 xr250r and it won't start.

Low compression can cause this. Insufficient valve tappet clearance is the most common cause of low compression on this engine. So, check the compression and, if it is lower that about 130 psi, have the valves adjusted.
Also make sure the kick starter actuated compression release isn't sticking after the kick starter is operated.
Another thing that can cause it to be difficult to start is a plugged up carburetor. If the bike has ever sat for more than about a year, then the carburetor needs to be disassembled and cleaned out.

Posted on Nov 15, 2009

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Exmark lazer HP 19 Kawasaki 50" deck new PTO and new relays blades engage for 30 minutes then shut off engine on. After cooling will engage for 10 minutes then shut off


Engine valves need adjusting.
symptoms: starts ok, runs until engine reaches max temp loses power then stops. can't restart when hot. once restarted runs for a while stops again.

There is very little clerance in these valves and temperature alters the lenth by a few thou and the valve don't close fully losing compression, once cold the valves shrink back enough to create enough compression to start again.

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My bike starts right up when its cold, and after running it for a little while and the motor is nice and hot and i shut it off like normal, it will not start back up. I have plenty of battery and its...


cylinder piston rings are getting hot causing it to loose compression , i would check compression when valves are closed or could be the coil getting hot causing it not to have spark

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I have a 1986 zx 600 ninja and its hard to start when its cold I have to use starting fluid but after running even for a min it starts great


Your problem is that your valves are not properly adjusted; had the same problem on my 1985 Ninja 600 - the colder the ambient temperature got the harder it was to start. After a valve adjustment it fired right up even in freezing temperatures very reliably.

Feb 18, 2012 | 1987 kawasaki GPZ 500 S - GPX 500 R

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Hello I am having problems with my 2004 kawasaki kx 250f. The biggest problem of it all is that I am afraid of running the bike because I do not want to blow a head gasket. When started up the bike...


Starting problems on your bike are usually related to twisting the throttle too often. Remember, the carb has a diaphragm pump in it that gives a shot of gas each time the throttle is twisted. That means the engine can flood quickly if you get happy on the gas. Gently use the kickstart lever to ease the piston just past top center on the compression stroke. Now give a good strong kick. Repeat as needed.

Jul 01, 2011 | 2004 kawasaki KX 250 F

1 Answer

Well I just bought a kawasaki kx 250f it is very hard to start runs fine after it is running but once it shuts off hard to start also it is tough to find neutral


i had a similar problem with mine starting and re starting hard. my problem was the vavle clerance on the exhaust side. the vavle was so tight it took me 20 minutes or more to start it. once it fires ran fine, a littel hotter than usal. i check the vavles for the proper clearance i adjusted them to manufacture settings put a new plug in and vroom started in less than 5 kicks. also check the acc pump diphram they tend to dissolve with age and use one they got bad or get thin the bike will not run right. once you have checked all of this also change the pluge, always helps to have a fresh plug.

hope that gets you started any more qustions let me know

mr. green

Mar 15, 2011 | 2004 kawasaki KX 250 F

1 Answer

My 2004 kx 250f often starts with one kick when cold but after that even after 1-10 minutes idling if it needs to be started again it will take 15-25 kicks..


Dont twist the throttle at all when starting the warm/hot engine. The carb has a diaphragm fuel pump that gives a shot of gas each time you crack the throttle open. It is very easy to flood the bike.

Jun 06, 2009 | 2004 kawasaki KX 250 F

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