Question about kawasaki KX 450 F Motorcycles

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My Kfx 450r doesnt want to run.it idles 2 sec, then dies

My Kfx 450r doesnt want to run.It turns over and idles for about 2 sec. then dies dunno if it could be a relay or sumthing that got wet after a power wash but its been drying out .

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  • michael huggins May 06, 2013

    my buddy had the same problem if you turn the idler screw to make it idle higher it should run right

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The KFX450R is a fuel injected quad. The problem you are most likely experiencing is a issue with the roll over sensor. It is a little black box located under the hood right behind the rectifier. For any and all information on the KFX450R check out kfx450hq.com there is a wealth of knowledge and experience as well as the people on there are happy to help you with any problems you may have.

Posted on Jan 09, 2015

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Hi there
If it is injected check all the sensors. My Kxf wouldnt start, I had it plugged in which was a waste of time. It turned out to be the tipover sensor and not the water temp sensor or the injector nozzle that the computer said it was. hope this helps

Posted on Oct 24, 2012

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I had the same problem with my kfx 450 i found out that the main throttle sensor was unpluged witch does not give it enough gas and your throttle is not running properly

Posted on Oct 01, 2009

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Were you able to fix the kfx450? I'm having the same exact problem. please help? email mbm250r@aol.com

Posted on Jun 11, 2009

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If u got the bike wet from driving it through water u may need to take carb off and let it dry then wash it petrol then put it back on and she will be up and running in no time turst me i have ktm sx 450 and ride it through water all the time

Posted on May 11, 2009

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When i start it it idles for 20 sec then dies it will start back up then dies again ?


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How can I get a wiring diagram for a Kawasaki KFX 450R?


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i dont know for sure but if i had to guess and thats all im doing here the unit might be warning you that the coolant temp sensor is bad and its preventing it from starting to reduce the chance of damage to the cooling system or to the engine? i could be wrong but that would be where i started. Or perhaps the coolant temp sensor came unhooked let me know if this is any help to you or not

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